US20050014027A1 - Superparamagnetic pearl polymers - Google Patents
Superparamagnetic pearl polymers Download PDFInfo
- Publication number
- US20050014027A1 US20050014027A1 US10/332,925 US33292503A US2005014027A1 US 20050014027 A1 US20050014027 A1 US 20050014027A1 US 33292503 A US33292503 A US 33292503A US 2005014027 A1 US2005014027 A1 US 2005014027A1
- Authority
- US
- United States
- Prior art keywords
- bead polymers
- meth
- bead
- acrylamide
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229920000642 polymer Polymers 0.000 title claims abstract description 85
- 150000007523 nucleic acids Chemical class 0.000 claims abstract description 28
- 108020004707 nucleic acids Proteins 0.000 claims abstract description 27
- 102000039446 nucleic acids Human genes 0.000 claims abstract description 27
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000011324 bead Substances 0.000 claims description 74
- 238000000034 method Methods 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 19
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 18
- 239000000178 monomer Substances 0.000 claims description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 16
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 15
- 239000012266 salt solution Substances 0.000 claims description 15
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims description 13
- 150000002505 iron Chemical class 0.000 claims description 13
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 9
- 239000004971 Cross linker Substances 0.000 claims description 8
- 238000006116 polymerization reaction Methods 0.000 claims description 8
- 230000008961 swelling Effects 0.000 claims description 8
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 7
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 7
- -1 2-imidazoylethyl Chemical group 0.000 claims description 6
- 235000014413 iron hydroxide Nutrition 0.000 claims description 6
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical class [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 claims description 6
- 125000003277 amino group Chemical group 0.000 claims description 5
- INQDDHNZXOAFFD-UHFFFAOYSA-N 2-[2-(2-prop-2-enoyloxyethoxy)ethoxy]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOCCOC(=O)C=C INQDDHNZXOAFFD-UHFFFAOYSA-N 0.000 claims description 4
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical class OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 244000052769 pathogen Species 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- MZGMQAMKOBOIDR-UHFFFAOYSA-N 2-[2-(2-hydroxyethoxy)ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOCCO MZGMQAMKOBOIDR-UHFFFAOYSA-N 0.000 claims description 3
- MCWMYICYUGCRDY-UHFFFAOYSA-N 2-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOCCOCCO MCWMYICYUGCRDY-UHFFFAOYSA-N 0.000 claims description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 210000004369 blood Anatomy 0.000 claims description 3
- 239000008280 blood Substances 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010557 suspension polymerization reaction Methods 0.000 claims description 3
- HSOOIVBINKDISP-UHFFFAOYSA-N 1-(2-methylprop-2-enoyloxy)butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(CCC)OC(=O)C(C)=C HSOOIVBINKDISP-UHFFFAOYSA-N 0.000 claims description 2
- OGBWMWKMTUSNKE-UHFFFAOYSA-N 1-(2-methylprop-2-enoyloxy)hexyl 2-methylprop-2-enoate Chemical compound CCCCCC(OC(=O)C(C)=C)OC(=O)C(C)=C OGBWMWKMTUSNKE-UHFFFAOYSA-N 0.000 claims description 2
- SAMJGBVVQUEMGC-UHFFFAOYSA-N 1-ethenoxy-2-(2-ethenoxyethoxy)ethane Chemical compound C=COCCOCCOC=C SAMJGBVVQUEMGC-UHFFFAOYSA-N 0.000 claims description 2
- QRIMLDXJAPZHJE-UHFFFAOYSA-N 2,3-dihydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(O)CO QRIMLDXJAPZHJE-UHFFFAOYSA-N 0.000 claims description 2
- HWSSEYVMGDIFMH-UHFFFAOYSA-N 2-[2-[2-(2-methylprop-2-enoyloxy)ethoxy]ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOCCOC(=O)C(C)=C HWSSEYVMGDIFMH-UHFFFAOYSA-N 0.000 claims description 2
- LTHJXDSHSVNJKG-UHFFFAOYSA-N 2-[2-[2-[2-(2-methylprop-2-enoyloxy)ethoxy]ethoxy]ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOCCOCCOC(=O)C(C)=C LTHJXDSHSVNJKG-UHFFFAOYSA-N 0.000 claims description 2
- VHSHLMUCYSAUQU-UHFFFAOYSA-N 2-hydroxypropyl methacrylate Chemical compound CC(O)COC(=O)C(C)=C VHSHLMUCYSAUQU-UHFFFAOYSA-N 0.000 claims description 2
- GWZMWHWAWHPNHN-UHFFFAOYSA-N 2-hydroxypropyl prop-2-enoate Chemical compound CC(O)COC(=O)C=C GWZMWHWAWHPNHN-UHFFFAOYSA-N 0.000 claims description 2
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical group FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 claims description 2
- JHWGFJBTMHEZME-UHFFFAOYSA-N 4-prop-2-enoyloxybutyl prop-2-enoate Chemical compound C=CC(=O)OCCCCOC(=O)C=C JHWGFJBTMHEZME-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 2
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 claims description 2
- 239000007900 aqueous suspension Substances 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 125000004386 diacrylate group Chemical group 0.000 claims description 2
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims description 2
- 238000005194 fractionation Methods 0.000 claims description 2
- 229920001519 homopolymer Polymers 0.000 claims description 2
- 159000000014 iron salts Chemical class 0.000 claims description 2
- 239000006166 lysate Substances 0.000 claims description 2
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims description 2
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims description 2
- GUAQVFRUPZBRJQ-UHFFFAOYSA-N n-(3-aminopropyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCCCN GUAQVFRUPZBRJQ-UHFFFAOYSA-N 0.000 claims description 2
- FZLUWDXMHJPGBS-UHFFFAOYSA-N n-(3-aminopropyl)prop-2-enamide Chemical compound NCCCNC(=O)C=C FZLUWDXMHJPGBS-UHFFFAOYSA-N 0.000 claims description 2
- FLGCVWCXYIMAHG-UHFFFAOYSA-N n-[3-(1h-imidazol-2-yl)-3-oxopropyl]-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCCC(=O)C1=NC=CN1 FLGCVWCXYIMAHG-UHFFFAOYSA-N 0.000 claims description 2
- HCFXUCHAVIIUQQ-UHFFFAOYSA-N n-[4-(1h-benzimidazol-2-yl)-4-oxobutyl]-2-methylprop-2-enamide Chemical compound C1=CC=C2NC(C(=O)CCCNC(=O)C(=C)C)=NC2=C1 HCFXUCHAVIIUQQ-UHFFFAOYSA-N 0.000 claims description 2
- WAFDFUCDTJSHBU-UHFFFAOYSA-N n-[4-(1h-benzimidazol-2-yl)-4-oxobutyl]prop-2-enamide Chemical compound C1=CC=C2NC(C(=O)CCCNC(=O)C=C)=NC2=C1 WAFDFUCDTJSHBU-UHFFFAOYSA-N 0.000 claims description 2
- UMHGWWKFSRFSSG-UHFFFAOYSA-N n-[4-(1h-imidazol-2-yl)-4-oxobutyl]-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCCCC(=O)C1=NC=CN1 UMHGWWKFSRFSSG-UHFFFAOYSA-N 0.000 claims description 2
- YIVJBZJUICMMBX-UHFFFAOYSA-N n-[4-(1h-imidazol-2-yl)-4-oxobutyl]prop-2-enamide Chemical compound C=CC(=O)NCCCC(=O)C1=NC=CN1 YIVJBZJUICMMBX-UHFFFAOYSA-N 0.000 claims description 2
- HLZSKFMYUZLEIH-UHFFFAOYSA-N n-[5-(1h-imidazol-2-yl)-2-methyl-5-oxopentan-2-yl]prop-2-enamide Chemical compound C=CC(=O)NC(C)(C)CCC(=O)C1=NC=CN1 HLZSKFMYUZLEIH-UHFFFAOYSA-N 0.000 claims description 2
- FBCQUCJYYPMKRO-UHFFFAOYSA-N prop-2-enyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC=C FBCQUCJYYPMKRO-UHFFFAOYSA-N 0.000 claims description 2
- QTECDUFMBMSHKR-UHFFFAOYSA-N prop-2-enyl prop-2-enoate Chemical compound C=CCOC(=O)C=C QTECDUFMBMSHKR-UHFFFAOYSA-N 0.000 claims description 2
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 125000001302 tertiary amino group Chemical group 0.000 claims description 2
- 229940096522 trimethylolpropane triacrylate Drugs 0.000 claims description 2
- 239000012472 biological sample Substances 0.000 claims 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 230000000379 polymerizing effect Effects 0.000 claims 1
- 239000000523 sample Substances 0.000 claims 1
- 238000012216 screening Methods 0.000 claims 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 238000003745 diagnosis Methods 0.000 description 8
- 239000002270 dispersing agent Substances 0.000 description 8
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 7
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000002068 genetic effect Effects 0.000 description 6
- 238000003752 polymerase chain reaction Methods 0.000 description 6
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- MLMGJTAJUDSUKA-UHFFFAOYSA-N 2-ethenyl-1h-imidazole Chemical compound C=CC1=NC=CN1 MLMGJTAJUDSUKA-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000003321 amplification Effects 0.000 description 4
- 239000012620 biological material Substances 0.000 description 4
- 239000003999 initiator Substances 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- QLIBJPGWWSHWBF-UHFFFAOYSA-N 2-aminoethyl methacrylate Chemical compound CC(=C)C(=O)OCCN QLIBJPGWWSHWBF-UHFFFAOYSA-N 0.000 description 3
- 108020004414 DNA Proteins 0.000 description 3
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229920001567 vinyl ester resin Polymers 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- MCPFORBUAZKAQE-UHFFFAOYSA-N 6-(dimethylamino)-2-methylhex-2-enoic acid Chemical compound CN(C)CCCC=C(C)C(O)=O MCPFORBUAZKAQE-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 241000596422 Pithecellobium Species 0.000 description 2
- 235000002194 Pithecellobium dulce Nutrition 0.000 description 2
- 235000007891 Pithecellobium lobatum Nutrition 0.000 description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- LXEKPEMOWBOYRF-UHFFFAOYSA-N [2-[(1-azaniumyl-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidoyl]azanium;dichloride Chemical compound Cl.Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N LXEKPEMOWBOYRF-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 150000002506 iron compounds Chemical class 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 125000005395 methacrylic acid group Chemical group 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 2
- XXQBEVHPUKOQEO-UHFFFAOYSA-N potassium superoxide Chemical compound [K+].[K+].[O-][O-] XXQBEVHPUKOQEO-UHFFFAOYSA-N 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- OWPUOLBODXJOKH-UHFFFAOYSA-N 2,3-dihydroxypropyl prop-2-enoate Chemical compound OCC(O)COC(=O)C=C OWPUOLBODXJOKH-UHFFFAOYSA-N 0.000 description 1
- OLQFXOWPTQTLDP-UHFFFAOYSA-N 2-(2-hydroxyethoxy)ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCO OLQFXOWPTQTLDP-UHFFFAOYSA-N 0.000 description 1
- RWXMAAYKJDQVTF-UHFFFAOYSA-N 2-(2-hydroxyethoxy)ethyl prop-2-enoate Chemical compound OCCOCCOC(=O)C=C RWXMAAYKJDQVTF-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- DPBJAVGHACCNRL-UHFFFAOYSA-N 2-(dimethylamino)ethyl prop-2-enoate Chemical compound CN(C)CCOC(=O)C=C DPBJAVGHACCNRL-UHFFFAOYSA-N 0.000 description 1
- VETIYACESIPJSO-UHFFFAOYSA-N 2-[2-(2-hydroxyethoxy)ethoxy]ethyl prop-2-enoate Chemical compound OCCOCCOCCOC(=O)C=C VETIYACESIPJSO-UHFFFAOYSA-N 0.000 description 1
- QUASZQPLPKGIJY-UHFFFAOYSA-N 2-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]ethyl prop-2-enoate Chemical compound OCCOCCOCCOCCOC(=O)C=C QUASZQPLPKGIJY-UHFFFAOYSA-N 0.000 description 1
- GTJOHISYCKPIMT-UHFFFAOYSA-N 2-methylundecane Chemical compound CCCCCCCCCC(C)C GTJOHISYCKPIMT-UHFFFAOYSA-N 0.000 description 1
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- 208000005443 Circulating Neoplastic Cells Diseases 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- SGVYKUFIHHTIFL-UHFFFAOYSA-N Isobutylhexyl Natural products CCCCCCCC(C)C SGVYKUFIHHTIFL-UHFFFAOYSA-N 0.000 description 1
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 1
- 108091028043 Nucleic acid sequence Proteins 0.000 description 1
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- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004365 Protease Substances 0.000 description 1
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 125000004103 aminoalkyl group Chemical group 0.000 description 1
- 239000012062 aqueous buffer Substances 0.000 description 1
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- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- LBSPZZSGTIBOFG-UHFFFAOYSA-N bis[2-(4,5-dihydro-1h-imidazol-2-yl)propan-2-yl]diazene;dihydrochloride Chemical compound Cl.Cl.N=1CCNC=1C(C)(C)N=NC(C)(C)C1=NCCN1 LBSPZZSGTIBOFG-UHFFFAOYSA-N 0.000 description 1
- 210000000601 blood cell Anatomy 0.000 description 1
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000009089 cytolysis Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- JVSWJIKNEAIKJW-UHFFFAOYSA-N dimethyl-hexane Natural products CCCCCC(C)C JVSWJIKNEAIKJW-UHFFFAOYSA-N 0.000 description 1
- VFNGKCDDZUSWLR-UHFFFAOYSA-L disulfate(2-) Chemical compound [O-]S(=O)(=O)OS([O-])(=O)=O VFNGKCDDZUSWLR-UHFFFAOYSA-L 0.000 description 1
- GMSCBRSQMRDRCD-UHFFFAOYSA-N dodecyl 2-methylprop-2-enoate Chemical group CCCCCCCCCCCCOC(=O)C(C)=C GMSCBRSQMRDRCD-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003891 environmental analysis Methods 0.000 description 1
- 238000001976 enzyme digestion Methods 0.000 description 1
- AFSIMBWBBOJPJG-UHFFFAOYSA-N ethenyl octadecanoate Chemical group CCCCCCCCCCCCCCCCCC(=O)OC=C AFSIMBWBBOJPJG-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 150000003840 hydrochlorides Chemical class 0.000 description 1
- 229940079826 hydrogen sulfite Drugs 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- VKPSKYDESGTTFR-UHFFFAOYSA-N isododecane Natural products CC(C)(C)CC(C)CC(C)(C)C VKPSKYDESGTTFR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 150000002828 nitro derivatives Chemical class 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical group CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000007170 pathology Effects 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 108091008146 restriction endonucleases Proteins 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54313—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being characterised by its particulate form
- G01N33/54326—Magnetic particles
- G01N33/5434—Magnetic particles using magnetic particle immunoreagent carriers which constitute new materials per se
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2446/00—Magnetic particle immunoreagent carriers
- G01N2446/10—Magnetic particle immunoreagent carriers the magnetic material being used to coat a pre-existing polymer particle but not being present in the particle core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/32—Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
Definitions
- the invention relates to cross-linked bead polymers doped with superparamagnetic iron oxide, to a method for producing the pearl polymers, as well as to their use in nucleic acid diagnosis.
- Genetic diagnosis has found its way into the diagnosis of human diseases (among others, detection of pathogens, detection of mutations in the genome, discovery of circulating tumor cells, and identification of risk factors for the predisposition for a disease).
- Veterinary medicine, environmental analysis, and food testing are also areas, however, that genetic diagnosis has recently found application.
- a further area of application is in studies by pathology/cytology institutions or in the context of forensic inquiries.
- genetic diagnosis is also being used in the context of quality control (e.g., studies of blood samples for freedom from pathogens), and the legislation is planning to create legislation for such tests in the future.
- Methods that are also used in genetic diagnosis are also a part of the routine methods when conducting scientific studies.
- genetic diagnosis such as hybridization and amplification techniques, for example, PCR (polymerase chain reaction), bDNA (branched DNA assay), or NASBA (nucleic acid sequence based amplification technology) are also a part of the routine methods when conducting scientific studies.
- PCR polymerase chain reaction
- bDNA branched DNA assay
- NASBA nucleic acid sequence based amplification technology
- Obtaining gene samples from biological material such as cells, blood, serum, or urine is an important partial step in genetic diagnosis.
- EP 0 707 077 describes a method for isolating nucleic acids from biological material by using a soluble, weakly basic polymer.
- a precipitant product in an acidic pH range is produced out of a soluble, weakly basic polymer and the nucleic acid.
- the precipitant product is separated from the nonprecipitant components of the biological material and washed, and the nucleic acid from the precipitant product is released by adjusting to a basic pH value.
- EP 0707 077 A disadvantage of the method in EP 0707 077 is that the manipulation, especially the separation and cleaning, of the precipitant product is difficult and takes a great deal of time. This method also cannot be performed, or can be performed only under difficult conditions, using automated analytic equipment.
- U.S. Pat. No. 4,339,337 and U.S. Pat. No. 5,356,713 describe methods to manufacture magnetic beads of a vinyl aromatic polymer by using magnetic particles.
- these bead polymers do not contain any functional groups to link nucleic acids.
- the beads exhibit marked residual magnetism (remanence) whereby their dispersibility is made more difficult.
- WO 8303920 describes a method for manufacturing magnetic polymer particles in which polymer particles are treated with solutions of iron salt, for example, whereby the iron is precipitated in the form of iron hydroxide.
- the precipitated iron compound is found both in the polymer particles and on the surface of the polymer particles.
- the iron compound on the surface can interfere.
- U.S. Pat. No. 5,206,159 discloses a method to manufacture superparamagnetic polyacrylamide carriers. However, these carriers are not suited for removing nucleic acids.
- a method to link DNA to magnetic microparticles is known from U.S. Pat. No. 5,705,628.
- the magnetic microparticles preferably have a particle size of 1 ⁇ m and possess a surface coated with carboxyl groups.
- special salt concentrations must be used, and polyethylene glycol must be added in defined concentrations and with a specific molecular weight.
- the object of the invention is cross-linked bead polymers doped with superparamagnetic iron oxide and containing basic amino groups wherein the bead polymers contain copolymerized units of hydrophilic (meth)acrylate and amino (meth)acrylates.
- (meth)acrylate means the derivatives of acrylic acid and methacrylic acid.
- Hydrophilic (meth)acrylates are those whose homopolymers are more than 2.5% soluble in water at 25° C. Examples include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, triethylene glycol monomethacrylate, tetraethylene glycol monomethacrylate, glycerol monomethacrylate, acrylamide, methacrylamide, and N,N-dimethyl acrylamide. Acrylamide is preferred.
- Amino (meth)acrylates as defined in the present invention are derivatives of acrylic acid and methacrylic acid preferably with secondary and tertiary amino groups.
- the amino groups can also form a part of a cycloaliphatic or aromatic ring.
- Suitable amino (meth)acrylates include, for example N-(3-amino-propyl) methacrylamide, N-(3-imidazoyl-propyl) methacrylamide, N-(2-imidazoyl-ethyl) methacrylamide, N-(3-amino-propyl) acrylamide, N-(3-imidazoyl-propyl) acrylamide, N-2(2-imidazoyl-ethyl) acrylamide, N-1(1,1-dimethyl-3-imidazoyl-propyl) methacrylamide, N-(1,1-dimethyl-3-imidazoyl-propyl) acrylamide, N-(3-benzimidazoy
- amino (meth)acrylates are amino alkyl (meth)acrylates, such as N,N-dimethyl-aminoethyl-methacrylate, N,N-dimethyl-aminopropyl-methacrylate, N,N-dimethyl-aminoethyl-acrylate, and N-tert-butyl-aminopropyl-methacrylate.
- N,N-dimethyl-aminoethyl-methacrylate and N,N-dimethyl-aminopropyl-methacrylate are especially preferable.
- the amino groups may be present in the bead polymers either wholly or partially in protonated form, e.g., as hydrochlorides.
- Potential crosslinkers include: ethylene glycol dimethacrylate, butanediol dimethacrylate, hexanediol dimethacrylate, pentaerytritol dimethacrylate, 1,2-glycerin-dimethacrylate, 1,3-glycerin-dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylol propane trimethacrylate, pentaerytritol trimethacrylate, pentaerytritol tetramethacrylate, ethylene glycol diacrylate, butanediol diacrylate, pentaerytriol diacrylate, 1,3-glycerin-diacrylate, triethylene glycol diacrylate, trimethylol propane triacrylate, pentaerytritol triacrylate, pentaerytritol tetraacrylate, allyl methacrylate, allyl acrylate, diethylene glycol divinyl
- the amount of hydrophilic (meth)acrylate is 30 to 89% by weight, preferably 40 to 75% by weight, the amount of amino (meth)acrylate is 10 to 69% by weight, preferably 20 to 50% by weight, and the amount of crosslinker is 1 to 25% by weight, in each case based on the total amount of hydrophilic (meth)acrylate, amino (meth)acrylate, and crosslinkers.
- the content of iron oxide in the superparamagnetic bead polymers is 2 to 80% by weight, preferably 4 to 50% by weight, most preferably 5 to 35% by weight, based on the weight of the unswollen bead polymers.
- the bead polymers are superparamagnetic, which means that they possess low residual magnetization (remanence) and small coercive force. Their magnetic saturation is high, and they have strong attraction to an inhomogeneous magnetic field. After deactivating the magnetic field, they can be easily and completely dispersed in water or aqueous buffer solutions.
- the particle size of the superparamagnetic bead polymers is 1 to 200 ⁇ m, preferably 5 to 100, and most preferably 10 to 50 ⁇ m.
- Microscopic image analysis is well suited for determining the average particle size ( ⁇ ) and the particle size distribution.
- Narrow distributions of particle sizes as defined by the invention mean D v /D z ⁇ 2.5, preferably D v /D z ⁇ 2, and most preferably D v /D z ⁇ 1.5. According to the invention, it has been found that bead polymers with narrow distribution of particle sizes are especially good for isolating nucleic acids and provide results with particularly good reproducibility in amplification processes on the surface of the bead polymers.
- the bead polymers are swellable in water. They have a swelling index of 1.25 to 8, preferably 2 to 6 (measured at 25° C.).
- the swelling index is defined as the quotient of the volume of the swollen bead polymers and the volume of the unswollen bead polymers.
- a further object of the present invention is a method for manufacturing cross-linked bead polymers wherein a monomer mixture of hydrophilic (meth)acrylate, amino (meth)acrylate, a crosslinker, and, where appropriate, other monomer is polymerized to beads by inverse suspension polymerization and the latter are then doped with superparamagnetic iron oxide by an after-treatment with iron salt solution.
- inverse suspension polymerization as defined by the invention is understood as a method in which the monomer mixture of hydrophilic (meth)acrylate, amino (meth)acrylate, a crosslinker, and, where appropriate, other monomer is activated with a free-radical former which is soluble in the monomer mixture and the activated monomer mixture is emulsified into droplets in a nonaqueous solvent by adding a dispersing agent and then the resulting droplets which have formed are cured by increasing the temperature.
- the hydrophilic (meth)acrylate, amino (meth)acrylate, and the crosslinker correspond to the aforesaid compounds.
- the amino (meth)acrylate can beneficially be used, at least partly, in the form of ammonium, as a hydrochloride, for example.
- suitable monomers include N-vinyl pyrrolidone, vinyl imidazol, styrene, ⁇ -methylstyrene, chlormethyl-styrene, acrylonitrile, vinyl acetate, and maleic anhydride in amounts of up to about 25% by weight, based on the entire monomer mixture. It is beneficial to dilute the monomer mixture with water or water-alcohol mixtures. Suitable amounts of diluent are 10 to 200% by weight, for example, preferably 50 to 100% by weight based on the monomer mixture.
- Azo compounds and peroxy compounds are suitable as free-radical initiators.
- potassium peroxidisulfate and sodium peroxodisulfate are very suitable, also in combination with bisulfite or hydrogen sulfite.
- Further preferred free-radical initiators are the azo compounds such as 2,2′-azobis[2-(2-imidazoline-2-yl)propane] dihydrochloride and 2,2′-azobis(2-amidinopropane) dihydrochloride.
- the free-radical initiator is used in amounts of 0.02 to 2.5% by weight, preferably from 0.1 to 1% by weight, based on the total monomer mixture.
- Hydrocarbons and halocarbons are well suited as nonaqueous solvents for the present invention, as well as low-viscosity silicon oils.
- the preference is for linear, branched, and cyclic aliphatic hydrocarbons, for example, hexane, heptane, n-octane, iso-octane, iso-dodecane, and cyclohexane. Mixtures of different hydrocarbons can also be used.
- Oil-soluble polymers with a molecular weight of 2,000 to 1,000,000 are suitable as dispersing agents.
- the preference is for polymers containing copolymerized units from C 6 - to C 22 -alkyl(meth)acrylates and/or vinyl esters from C 6 - to C 22 -carboxylic acids, for example, polymers with copolymerized units of stearyl methacrylate, lauryl methacrylate, and vinyl stearate.
- hydrophilic monomers in this context means polymerizable olefinically unsaturated compounds that are wholly or partially soluble in water (more than 2.5% by weight at 20° C.). Examples include: acrylic acid and its alkali metal and ammonium salts, methacrylic acid and its alkali metal and ammonium salts, hydroxyethyl methacrylate, hydroxyethyl acrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, triethylene glycol monoacrylate, triethylene glycol monomethacrylate, tetraethylene glycol monoacrylate, tetraethylene glycol monomethacrylate, glycerol monoacrylate, aminoethyl methacrylate, N,N-dimethyl-aminoethyl-methacrylate, acrylamide, methacrylamide, vinyl pyrollidone and vinyl imidazol.
- Especially preferred dispersing agents are copolymers of
- the quantity of the dispersing agent used is generally 0.1 to 8%, preferably 0.5 to 5%, by weight, based on the nonaqueous solvent.
- the speed of stirring during polymerization is important for adjusting the particle size.
- the size of the obtained bead polymers decreases as the stirrer speed increases.
- the exact stirrer speed to adjust to a particular predetermined bead size strongly depends in the individual case on the reactor size, the reactor geometry, and the stirrer geometry. It has proved effective to determine the stirrer speed experimentally.
- bead diameters of 10 to 25 ⁇ m are generally achieved at rotational speeds of 800 to 1,000 rpm when using copolymers of methacrylic acid-C 13 -ester and hydroxyethyl-methacrylate as a dispersing aid.
- the polymerization temperature depends on the decomposition temperature of the initiator employed and the boiling temperature of the nonaqueous solvent. It is generally between 50 and 150° C., preferably between 55 and 100° C. The polymerization takes 0.5 to a few hours, for example, 10 hours.
- the polymer can be isolated using usual methods, e.g., by filtering or decanting, and, if needed, dried after one or more washing steps. It is possible to fractionate the resulting bead polymer by physical methods in order to adjust to a narrower distribution of particle sizes. Suitable fractionation methods are, for example, sieving, sedimentation, and air classification.
- the after treatment for doping with superparamagnetic iron oxide is done with mixtures of aqueous Fe 2+ and Fe 3+ salt solutions.
- the corresponding chlorides are very suitable.
- the molar ratio of Fe 2+ :Fe 3+ should be 2:1 to 1:2. It is possible to start from iron salt solutions with a different Fe 2+ : Fe 3+ ratio and to effect the optimal ratio of Fe 2+ : Fe 3+ by using oxidizing or reducing agents.
- Suitable examples of oxidizing agents are peroxo and nitro compounds, and of reducing agents e.g., sodium bisulfite.
- the concentration of iron salt solutions is in general 10 to 50% by weight, preferably 20 to 40% by weight.
- the iron salt solution is preferably brought into contact with a dried, anhydrous bead polymer. It is of particular benefit if the bead polymer swells by taking up the entire iron salt solution and if no excess iron salt solution remains in the interstices of the beads or on the surface of the beads.
- the iron salts taken up by the swollen bead polymer are converted into the corresponding iron hydroxides by adding bases.
- bases Well suited for this are alkaline solutions of sodium hydroxide, sodium carbonate, or ammonia. Ammonia is preferred because an excess of it can be easily removed through evaporation. Ammonium salts formed are removed by thorough washing with water.
- the iron hydroxide is converted into iron oxide (dehydrated) by heating the bead polymer.
- the heat treatment can be easily done in aqueous suspension at 65 to 100° C. Suitable times for heating are 0.5 to 5 hours.
- the conversion of the iron hydroxide into iron oxide is evident from a change in color from light brown to dark brown or black. Subsequently, the bead polymer can be separated and dried.
- the dried bead polymers doped with superparamagnetic iron oxide can be processed one more time in the manner described above, whereby the content of superparamagnetic iron oxide is increased. In this way, it is possible to obtain iron oxide contents of more than 50% by weight.
- the present invention further relates to a method for isolating nucleic acids from a sample, comprising the following steps:
- the method according to the invention is suited to isolate and/or purify nucleic acids of different origins, for example from cells, tissue materials, blood, or pathogens.
- the material to be studied Prior to isolating the nucleic acids, the material to be studied is disrupted by using techniques known per se such as disruption via protease digestion, resulting in a sample suitable for subsequent steps A through C, a lysate. If needed, the lysis of the biological material takes places in an interim step after method step A).
- Other suitable disruption methods have been described in DE-A-4 333 805.
- the sample is mixed with the bead polymer at a pH value of 7 or less, preferably in the range of 2 to 6, most preferably in the range of 2 to 3, at room temperature.
- the separation of the bead polymers is done using a magnetic field.
- the complex of nucleic acid and bead polymer obtained in this way can then be purified by washing with suitable buffers.
- the pH of the complex is then adjusted to pH values above 7, preferably from 8 to 14, most preferably in the range of 12 to 14.
- the bead polymers according to the invention provide higher adsorption and release rates than the soluble polymers disclosed in EP-A-0 707 077. Isolation can be performed more easily, i.e., with fewer steps and in shorter times. The purity of the isolated nucleic acids is higher, and in particular they contain fewer inhibiting byproducts so that amplification of the nucleic acids works especially well, for example through the so-called “PCR reaction” and “RT PCR.” The method according to the invention is also superior to the method described in EP-A-0 707 077 in relation to restriction enzyme digestion of the obtained nucleic acids.
- the bead polymers according to the invention are also well suited to amplifying the adsorbed nucleic acids, for example through the so-called “TaqMan PCR reaction,” directly on the bead polymers (i.e., without step C).
- the bead polymer treated with iron salt solution was mixed with 300 ml water and stirred for 30 minutes under a stream of air and then heated to 72° C.
- the pH value was set at 9 during the entire process by adding ammonia solution.
- 0.155 g potassium peroxodisulfate was then added to the solution and heated another 2.5 hours at 72° C. After decanting the liquid, the solid was washed five times with water while being treated with ultrasound. 5.1 g of black bead polymer with an iron content of 6% by weight, which is strongly attracted to an inhomogeneous magnetic field were obtained.
- the reaction mixture was added with 0.313 g 2,2′-azobis(2-amidinopropane) dihydrochloride, dissolved in a mixture of 4.25 g water and 2 g methanol, and flushed at 450 rpm for 10 minutes with nitrogen gas.
- the temperature was raised within 1 hour at 800 rpm to 60° C. and the reaction was allowed to take place at this temperature for four hours.
- the resultant polymer was separated from the reaction solution by decanting, and purified three times with cyclohexane, water, and methanol and dried at 40° C. in a vacuum oven. 15 g of dried bead polymer with an average particle size of 20 ⁇ m and a swelling index of 5 at 25° C. in water were obtained.
Abstract
The invention relates to cross-linked pearl polymers doped with superparamagnetic iron oxide, to a method for producing said pearl polymers, and to their use in nucleic acid diagnostics.
Description
- The invention relates to cross-linked bead polymers doped with superparamagnetic iron oxide, to a method for producing the pearl polymers, as well as to their use in nucleic acid diagnosis.
- Recently, so-called genetic diagnosis have gained increased significance.
- Genetic diagnosis has found its way into the diagnosis of human diseases (among others, detection of pathogens, detection of mutations in the genome, discovery of circulating tumor cells, and identification of risk factors for the predisposition for a disease). Veterinary medicine, environmental analysis, and food testing are also areas, however, that genetic diagnosis has recently found application. A further area of application is in studies by pathology/cytology institutions or in the context of forensic inquiries. In addition, however, genetic diagnosis is also being used in the context of quality control (e.g., studies of blood samples for freedom from pathogens), and the legislature is planning to create legislation for such tests in the future. Methods that are also used in genetic diagnosis (such as hybridization and amplification techniques, for example, PCR (polymerase chain reaction), bDNA (branched DNA assay), or NASBA (nucleic acid sequence based amplification technology) are also a part of the routine methods when conducting scientific studies.
- Obtaining gene samples from biological material such as cells, blood, serum, or urine is an important partial step in genetic diagnosis.
- EP 0 707 077 describes a method for isolating nucleic acids from biological material by using a soluble, weakly basic polymer. In this method, a precipitant product in an acidic pH range is produced out of a soluble, weakly basic polymer and the nucleic acid. The precipitant product is separated from the nonprecipitant components of the biological material and washed, and the nucleic acid from the precipitant product is released by adjusting to a basic pH value.
- A disadvantage of the method in EP 0707 077 is that the manipulation, especially the separation and cleaning, of the precipitant product is difficult and takes a great deal of time. This method also cannot be performed, or can be performed only under difficult conditions, using automated analytic equipment.
- U.S. Pat. No. 4,339,337 and U.S. Pat. No. 5,356,713 describe methods to manufacture magnetic beads of a vinyl aromatic polymer by using magnetic particles. However, these bead polymers do not contain any functional groups to link nucleic acids. In addition, the beads exhibit marked residual magnetism (remanence) whereby their dispersibility is made more difficult.
- WO 8303920 describes a method for manufacturing magnetic polymer particles in which polymer particles are treated with solutions of iron salt, for example, whereby the iron is precipitated in the form of iron hydroxide. In this method, the precipitated iron compound is found both in the polymer particles and on the surface of the polymer particles. For a few applications, for example to amplify nucleic acids with TaqMan PCR, the iron compound on the surface can interfere.
- U.S. Pat. No. 5,206,159 discloses a method to manufacture superparamagnetic polyacrylamide carriers. However, these carriers are not suited for removing nucleic acids.
- A method to link DNA to magnetic microparticles is known from U.S. Pat. No. 5,705,628. The magnetic microparticles preferably have a particle size of 1 μm and possess a surface coated with carboxyl groups. In order to link the DNA to the particles, special salt concentrations must be used, and polyethylene glycol must be added in defined concentrations and with a specific molecular weight.
- It has now been found that certain cross-linked bead polymers that have been doped with superparamagnetic iron oxide and that contain basic amino groups are extremely well suited for direct and automated isolation of nucleic acids.
- The object of the invention is cross-linked bead polymers doped with superparamagnetic iron oxide and containing basic amino groups wherein the bead polymers contain copolymerized units of hydrophilic (meth)acrylate and amino (meth)acrylates.
- The term (meth)acrylate means the derivatives of acrylic acid and methacrylic acid.
- Hydrophilic (meth)acrylates are those whose homopolymers are more than 2.5% soluble in water at 25° C. Examples include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, triethylene glycol monomethacrylate, tetraethylene glycol monomethacrylate, glycerol monomethacrylate, acrylamide, methacrylamide, and N,N-dimethyl acrylamide. Acrylamide is preferred.
- Amino (meth)acrylates as defined in the present invention are derivatives of acrylic acid and methacrylic acid preferably with secondary and tertiary amino groups. The amino groups can also form a part of a cycloaliphatic or aromatic ring. Suitable amino (meth)acrylates include, for example N-(3-amino-propyl) methacrylamide, N-(3-imidazoyl-propyl) methacrylamide, N-(2-imidazoyl-ethyl) methacrylamide, N-(3-amino-propyl) acrylamide, N-(3-imidazoyl-propyl) acrylamide, N-2(2-imidazoyl-ethyl) acrylamide, N-1(1,1-dimethyl-3-imidazoyl-propyl) methacrylamide, N-(1,1-dimethyl-3-imidazoyl-propyl) acrylamide, N-(3-benzimidazoyl-propyl) methacrylamide, and (3-benzimidazoyl-propyl) acrylamide. Preferred amino (meth)acrylates are amino alkyl (meth)acrylates, such as N,N-dimethyl-aminoethyl-methacrylate, N,N-dimethyl-aminopropyl-methacrylate, N,N-dimethyl-aminoethyl-acrylate, and N-tert-butyl-aminopropyl-methacrylate. N,N-dimethyl-aminoethyl-methacrylate and N,N-dimethyl-aminopropyl-methacrylate are especially preferable. According to the invention, the amino groups may be present in the bead polymers either wholly or partially in protonated form, e.g., as hydrochlorides.
- Potential crosslinkers include: ethylene glycol dimethacrylate, butanediol dimethacrylate, hexanediol dimethacrylate, pentaerytritol dimethacrylate, 1,2-glycerin-dimethacrylate, 1,3-glycerin-dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylol propane trimethacrylate, pentaerytritol trimethacrylate, pentaerytritol tetramethacrylate, ethylene glycol diacrylate, butanediol diacrylate, pentaerytriol diacrylate, 1,3-glycerin-diacrylate, triethylene glycol diacrylate, trimethylol propane triacrylate, pentaerytritol triacrylate, pentaerytritol tetraacrylate, allyl methacrylate, allyl acrylate, diethylene glycol divinyl ether, and methylene-N,N-bisacrylamide. Methylene-N,N′-bisacrylamide is preferred.
- The amount of hydrophilic (meth)acrylate is 30 to 89% by weight, preferably 40 to 75% by weight, the amount of amino (meth)acrylate is 10 to 69% by weight, preferably 20 to 50% by weight, and the amount of crosslinker is 1 to 25% by weight, in each case based on the total amount of hydrophilic (meth)acrylate, amino (meth)acrylate, and crosslinkers.
- According to the invention, the content of iron oxide in the superparamagnetic bead polymers is 2 to 80% by weight, preferably 4 to 50% by weight, most preferably 5 to 35% by weight, based on the weight of the unswollen bead polymers.
- According to the invention, the bead polymers are superparamagnetic, which means that they possess low residual magnetization (remanence) and small coercive force. Their magnetic saturation is high, and they have strong attraction to an inhomogeneous magnetic field. After deactivating the magnetic field, they can be easily and completely dispersed in water or aqueous buffer solutions.
- According to the invention, the particle size of the superparamagnetic bead polymers is 1 to 200 μm, preferably 5 to 100, and most preferably 10 to 50 μm. Microscopic image analysis is well suited for determining the average particle size (Ø) and the particle size distribution.
- The ratio between the average of the volume distribution (Dv) and the average of the number distribution (Dz) is used as a measure for the breadth of the particle size distribution of the bead polymers. Narrow distributions of particle sizes as defined by the invention mean Dv/Dz≦2.5, preferably Dv/Dz≦2, and most preferably Dv/Dz≦1.5. According to the invention, it has been found that bead polymers with narrow distribution of particle sizes are especially good for isolating nucleic acids and provide results with particularly good reproducibility in amplification processes on the surface of the bead polymers.
- According to the invention, the bead polymers are swellable in water. They have a swelling index of 1.25 to 8, preferably 2 to 6 (measured at 25° C.). The swelling index is defined as the quotient of the volume of the swollen bead polymers and the volume of the unswollen bead polymers.
- To determine the swelling index experimentally, 10 ml of dried, sieved bead polymer are weighed into a 100 ml graduated cylinder. The quotient of the volume of the bed (V0) and the weighed (m) is the bulk volume Vbulk. The graduated cylinder is filled with water to 100 ml and allowed to stand for 10 to 20 hours at 25° C. During this time, it is shaken occasionally so that any air bubbles that occur can escape. The volume of the swollen bed is read and produces V1. The quotient of V1 and V0 is the swelling index.
- A further object of the present invention is a method for manufacturing cross-linked bead polymers wherein a monomer mixture of hydrophilic (meth)acrylate, amino (meth)acrylate, a crosslinker, and, where appropriate, other monomer is polymerized to beads by inverse suspension polymerization and the latter are then doped with superparamagnetic iron oxide by an after-treatment with iron salt solution.
- The term inverse suspension polymerization as defined by the invention is understood as a method in which the monomer mixture of hydrophilic (meth)acrylate, amino (meth)acrylate, a crosslinker, and, where appropriate, other monomer is activated with a free-radical former which is soluble in the monomer mixture and the activated monomer mixture is emulsified into droplets in a nonaqueous solvent by adding a dispersing agent and then the resulting droplets which have formed are cured by increasing the temperature.
- The hydrophilic (meth)acrylate, amino (meth)acrylate, and the crosslinker correspond to the aforesaid compounds. The amino (meth)acrylate can beneficially be used, at least partly, in the form of ammonium, as a hydrochloride, for example. Other suitable monomers include N-vinyl pyrrolidone, vinyl imidazol, styrene, α-methylstyrene, chlormethyl-styrene, acrylonitrile, vinyl acetate, and maleic anhydride in amounts of up to about 25% by weight, based on the entire monomer mixture. It is beneficial to dilute the monomer mixture with water or water-alcohol mixtures. Suitable amounts of diluent are 10 to 200% by weight, for example, preferably 50 to 100% by weight based on the monomer mixture.
- Azo compounds and peroxy compounds are suitable as free-radical initiators. When using water as a diluent, potassium peroxidisulfate and sodium peroxodisulfate are very suitable, also in combination with bisulfite or hydrogen sulfite. Further preferred free-radical initiators are the azo compounds such as 2,2′-azobis[2-(2-imidazoline-2-yl)propane] dihydrochloride and 2,2′-azobis(2-amidinopropane) dihydrochloride. The free-radical initiator is used in amounts of 0.02 to 2.5% by weight, preferably from 0.1 to 1% by weight, based on the total monomer mixture.
- Hydrocarbons and halocarbons are well suited as nonaqueous solvents for the present invention, as well as low-viscosity silicon oils. The preference is for linear, branched, and cyclic aliphatic hydrocarbons, for example, hexane, heptane, n-octane, iso-octane, iso-dodecane, and cyclohexane. Mixtures of different hydrocarbons can also be used.
- Oil-soluble polymers with a molecular weight of 2,000 to 1,000,000 are suitable as dispersing agents. The preference is for polymers containing copolymerized units from C6- to C22-alkyl(meth)acrylates and/or vinyl esters from C6- to C22-carboxylic acids, for example, polymers with copolymerized units of stearyl methacrylate, lauryl methacrylate, and vinyl stearate. Especially well suited are copolymers from C6- to C22-alkyl(meth)acrylates and vinyl esters from C6- to C22-carboxylic acids and hydrophilic monomers. The term hydrophilic monomers in this context means polymerizable olefinically unsaturated compounds that are wholly or partially soluble in water (more than 2.5% by weight at 20° C.). Examples include: acrylic acid and its alkali metal and ammonium salts, methacrylic acid and its alkali metal and ammonium salts, hydroxyethyl methacrylate, hydroxyethyl acrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, triethylene glycol monoacrylate, triethylene glycol monomethacrylate, tetraethylene glycol monoacrylate, tetraethylene glycol monomethacrylate, glycerol monoacrylate, aminoethyl methacrylate, N,N-dimethyl-aminoethyl-methacrylate, acrylamide, methacrylamide, vinyl pyrollidone and vinyl imidazol. The preference is for hydroxyethyl methacrylate, aminoethyl methacrylate, N,N-dimethyl-aminoethyl-methacrylate, acrylamide, methacrylamide, vinyl pyrrolidone, and vinyl imidazol.
- Especially preferred dispersing agents are copolymers of
-
- 75 to 99% by weight C6- to C22-alkyl-(meth)acrylate and/or vinyl esters from C6— to C2-2-carboxylic acids, and
- 1 to 25% by weight hydrophilic monomers from the group that includes hydroxyethyl methacrylate, aminoethyl methacrylate, N,N-dimethyl-aminoethyl-methacrylate, acrylamide, methacrylamide, vinyl pyrrolidone, and vinyl imidazol.
- The quantity of the dispersing agent used is generally 0.1 to 8%, preferably 0.5 to 5%, by weight, based on the nonaqueous solvent.
- The speed of stirring during polymerization is important for adjusting the particle size. According to the invention, the size of the obtained bead polymers decreases as the stirrer speed increases. The exact stirrer speed to adjust to a particular predetermined bead size strongly depends in the individual case on the reactor size, the reactor geometry, and the stirrer geometry. It has proved effective to determine the stirrer speed experimentally. For laboratory reactors with a reaction volume of 0.5 liters that are equipped with a gate stirrer, bead diameters of 10 to 25 μm are generally achieved at rotational speeds of 800 to 1,000 rpm when using copolymers of methacrylic acid-C13-ester and hydroxyethyl-methacrylate as a dispersing aid.
- The polymerization temperature depends on the decomposition temperature of the initiator employed and the boiling temperature of the nonaqueous solvent. It is generally between 50 and 150° C., preferably between 55 and 100° C. The polymerization takes 0.5 to a few hours, for example, 10 hours.
- After polymerization, the polymer can be isolated using usual methods, e.g., by filtering or decanting, and, if needed, dried after one or more washing steps. It is possible to fractionate the resulting bead polymer by physical methods in order to adjust to a narrower distribution of particle sizes. Suitable fractionation methods are, for example, sieving, sedimentation, and air classification.
- The after treatment for doping with superparamagnetic iron oxide is done with mixtures of aqueous Fe2+ and Fe3+ salt solutions. The corresponding chlorides are very suitable. The molar ratio of Fe2+:Fe3+ should be 2:1 to 1:2. It is possible to start from iron salt solutions with a different Fe2+: Fe3+ ratio and to effect the optimal ratio of Fe2+: Fe3+ by using oxidizing or reducing agents. Suitable examples of oxidizing agents are peroxo and nitro compounds, and of reducing agents e.g., sodium bisulfite. The concentration of iron salt solutions is in general 10 to 50% by weight, preferably 20 to 40% by weight.
- The iron salt solution is preferably brought into contact with a dried, anhydrous bead polymer. It is of particular benefit if the bead polymer swells by taking up the entire iron salt solution and if no excess iron salt solution remains in the interstices of the beads or on the surface of the beads.
- The iron salts taken up by the swollen bead polymer are converted into the corresponding iron hydroxides by adding bases. Well suited for this are alkaline solutions of sodium hydroxide, sodium carbonate, or ammonia. Ammonia is preferred because an excess of it can be easily removed through evaporation. Ammonium salts formed are removed by thorough washing with water.
- The iron hydroxide is converted into iron oxide (dehydrated) by heating the bead polymer. The heat treatment can be easily done in aqueous suspension at 65 to 100° C. Suitable times for heating are 0.5 to 5 hours. The conversion of the iron hydroxide into iron oxide is evident from a change in color from light brown to dark brown or black. Subsequently, the bead polymer can be separated and dried.
- If desired, the dried bead polymers doped with superparamagnetic iron oxide can be processed one more time in the manner described above, whereby the content of superparamagnetic iron oxide is increased. In this way, it is possible to obtain iron oxide contents of more than 50% by weight.
- The present invention further relates to a method for isolating nucleic acids from a sample, comprising the following steps:
- A) mixing the sample with a bead polymer at a pH of 7 or less, whereby the nucleic acids are adsorbed,
- B) removing the bead polymer, including the adsorbed nucleic acids, by using a magnetic field,
and - C) mixing the bead polymer with an aqueous phase with a pH above 7, whereby the adsorbed nucleic acids are released,
which is characterized in that the bead polymer is doped with superparamagnetic iron oxide and contains copolymerized units of hydrophilic (meth)acrylate and amino (meth)acrylate. - The method according to the invention is suited to isolate and/or purify nucleic acids of different origins, for example from cells, tissue materials, blood, or pathogens. Prior to isolating the nucleic acids, the material to be studied is disrupted by using techniques known per se such as disruption via protease digestion, resulting in a sample suitable for subsequent steps A through C, a lysate. If needed, the lysis of the biological material takes places in an interim step after method step A). Other suitable disruption methods have been described in DE-A-4 333 805.
- The sample is mixed with the bead polymer at a pH value of 7 or less, preferably in the range of 2 to 6, most preferably in the range of 2 to 3, at room temperature. The separation of the bead polymers is done using a magnetic field. The complex of nucleic acid and bead polymer obtained in this way can then be purified by washing with suitable buffers.
- To release the bound nucleic acids from the complex, the pH of the complex is then adjusted to pH values above 7, preferably from 8 to 14, most preferably in the range of 12 to 14.
- The bead polymers according to the invention provide higher adsorption and release rates than the soluble polymers disclosed in EP-A-0 707 077. Isolation can be performed more easily, i.e., with fewer steps and in shorter times. The purity of the isolated nucleic acids is higher, and in particular they contain fewer inhibiting byproducts so that amplification of the nucleic acids works especially well, for example through the so-called “PCR reaction” and “RT PCR.” The method according to the invention is also superior to the method described in EP-A-0 707 077 in relation to restriction enzyme digestion of the obtained nucleic acids.
- The bead polymers according to the invention are also well suited to amplifying the adsorbed nucleic acids, for example through the so-called “TaqMan PCR reaction,” directly on the bead polymers (i.e., without step C).
- Preparation of a Bead Polymer According to the Invention
- 1a) Preparation of a Dispersing Agent
- In a 4 liter reaction vessel with a gate stirrer and gas feed and gas discharge hoses, a solution of 1,324 g cyclohexane, 511 g methacrylic acid-C13-ester, 57 g hydroxyethyl methacrylate, and 3.8 g dibenzoyl peroxide was heated under a nitrogen atmosphere to 78° C. over a period of 2 hours at 300 rpm, kept at this temperature for 10 hours, then heated to 90° C. and kept for another 1.5 hours at this temperature. Then, it was cooled to 25° C. 1,835 g of a 30.5% solution by weight of a dispersing agent was obtained. The Staudinger index, measured with an Ubbelohde viscosimeter at 25° C., was 72.6 ml/g.
- 1b) Preparation of a Cross-Linked Bead Polymer
- In a 0.5 liter reaction vessel with a gate stirrer, reflux condenser, and thermosensor, 41.25 g of dispersing agent solution from 1a) and 240 g cyclohexane were introduced and stirred. 9.38 g N,N-dimethyl-aminoethyl-methacrylate was stirred with 13.3 g water and 5.89 g 37% strength hydrochloric acid for 5 minutes and neutralized with 0.6 g of 1N NaOH. This solution was then added to the reaction vessel. To this mixture were added 20.31 g acrylamide and 1.56 g methylene-N,N′-bisacrylamide, dissolved in 8 g methanol. 0.063 g potassium peroxide disulfate, dissolved in a mixture of 4.25 g water and 2 g methanol was added to the reaction mixture, which was then flushed at 450 rpm for 10 min with nitrogen gas. The stirring speed was increased to 1,000 rpm and the temperature raised to 60° C. over the course of 1 hour, and kept at this temperature for 10 hours. After cooling, the resultant polymer was removed by decanting from the reaction solution and purified three times each with cyclohexane, water, and methanol and dried at 40° C. in a vacuum oven. 14.7 g were obtained of dried bead polymer with an average particle size of 12 μm and a swelling index of 6 at 25° C. in water.
- 1c) Doping the Bead Polymer with Iron Oxide
- In a stirring vessel with a magnetic stirrer and thermometer, 3.625 g iron (II) chloride tetrahydrate, 1.5 g iron (III) chloride (anhydrous), and 0.3 g sodium bisulfite were dissolved in 5.75 ml water.
- 5 g of dried bead polymer (1b) was introduced in a 100 ml three-necked flask and externally cooled with ice, and the iron salt solution described above was added. The resultant suspension was stirred for 35 minutes and externally heated with boiling water until the suspension had become a solid mixture. The bead polymer was stirred for 1 hour in another 500 ml flask with an alkaline solution of 67.5 ml water and 8.5 ml 26% ammonia solution (pH=9) and diluted with 250 ml water. After decanting the solution, this process was repeated several times.
- The bead polymer treated with iron salt solution was mixed with 300 ml water and stirred for 30 minutes under a stream of air and then heated to 72° C. The pH value was set at 9 during the entire process by adding ammonia solution. 0.155 g potassium peroxodisulfate was then added to the solution and heated another 2.5 hours at 72° C. After decanting the liquid, the solid was washed five times with water while being treated with ultrasound. 5.1 g of black bead polymer with an iron content of 6% by weight, which is strongly attracted to an inhomogeneous magnetic field were obtained.
- Preparation of a Bead Polymer According to the Invention
- 2a) Preparation of a Cross-Linked Bead Polymer
- In a 0.5 l reaction vessel with a gate stirrer, reflux condenser, and thermosensor, 41 g dispersing agent solution from 1a) and 240 g cyclohexane were introduced and stirred. 9.38 g N,N-dimethyl-aminoethyl-methacrylate were stirred for 5 minutes with 13.3 g water and 6 g 37% hydrochloric acid. This solution was poured into the reaction vessel. To this mixture was added 18.75 g acrylamide and 3.13 g methylene-N,N′-bisacrylamide, dissolved in 8 g methanol. The reaction mixture was added with 0.313 g 2,2′-azobis(2-amidinopropane) dihydrochloride, dissolved in a mixture of 4.25 g water and 2 g methanol, and flushed at 450 rpm for 10 minutes with nitrogen gas. The temperature was raised within 1 hour at 800 rpm to 60° C. and the reaction was allowed to take place at this temperature for four hours. After cooling, the resultant polymer was separated from the reaction solution by decanting, and purified three times with cyclohexane, water, and methanol and dried at 40° C. in a vacuum oven. 15 g of dried bead polymer with an average particle size of 20 μm and a swelling index of 5 at 25° C. in water were obtained.
- 2b) Doping the Bead Polymer with Iron Oxide
- 5 g of the bead polymer from 2a) was doped with iron oxide as described under 1c). In doing so, the entire process was repeated twice. 5.4 g were obtained of black bead polymer with an iron content of 8.3% by weight, which is strongly attracted to an inhomogeneous magnetic field.
Claims (28)
1-10. (cancelled)
11. A process for preparing superparamagnetic bead polymers, comprising:
(a) polymerizing a monomer mixture comprising hydrophilic (meth)acrylate and amino(meth)acrylate to form bead polymers;
(b) contacting the bead polymers with a sufficient amount of an iron salt solution to form the superparamagnetic iron oxide bead polymers.
12. The process of claim 11 , wherein the polymerization reaction is conducted with a crosslinker.
13. The process of claim 12 , wherein the crosslinker is selected from the group consisting of ethylene glycol dimethacrylate, butanediol dimethacrylate, hexanediol dimethacrylate, pentaerytritol dimethacrylate, 1,2-glycerin-dimethacrylate, 1,3-glycerin-dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylol propane trimethacrylate, pentaerytritol trimethacrylate, pentaerytritol tetramethacrylate, ethylene glycol diacrylate, butanediol diacrylate, pentaerytriol diacrylate, 1,3-glycerin-diacrylate, triethylene glycol diacrylate, trimethylol propane triacrylate, pentaerytritol triacrylate, pentaerytritol tetraacrylate, allyl methacrylate, allyl acrylate, diethylene glycol divinyl ether, and methylene-N,N′-bisacrylamide.
14. The process of claim 11 wherein the hydrophilic (meth)acrylates are those whose homopolymers have a solubility of more than 2.5% in water at 25° C.
15. The process of claim 14 , wherein the hydrophilic (meth)acrylates are selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, triethylene glycol monomethacrylate, tetraethylene glycol monomethacrylate, glycerol monomethacrylate, acrylamide, methacrylamide, and N,N-dimethyl acrylamide.
16. The process of claim 11 , wherein the amino (meth)acrylates are derivatives of acrylic acid and (meth)acrylic acid.
17. The process of claim 16 , wherein the amino (meth)acrylates contain secondary and tertiary amino groups.
18. The process of claim 17 , wherein the amino groups are part of a cycloaliphatic or aromatic ring.
19. The process of claim 11 wherein the amino (meth)acrylates are selected from the group consisting of N-(3-amino-propyl) methacrylamide, N-(3-imidazoylpropyl) methacrylamide, N-(2-imidazoylethyl) methacrylamide, N-(3-aminopropyl) acrylamide, N-(3-imidazoylpropyl) acrylamide, N-(2(2-imidazoylethyl) acrylamide, N-(1(1,1-dimethyl-3-imidazoylpropyl) methacrylamide, N-(1,1-dimethyl-3-imidazoylpropyl) acrylamide, N-(3-benzimidazoylpropyl) methacrylamide, and (3-benzimidazoylpropyl) acrylamide.
20. The process of claim 11 , wherein the superparamagnetic bead polymers have a particle size of about 1 to about 200 microns.
21. The process of claim 11 , wherein the particle size distribution of the bead polymers is less than or equal to 2.5.
22. The process of claim 1, wherein the bead polymers have a swelling index of about 1.25 to about 8, measured at 25° C.
23. The process of claim 11 , wherein the polymerization is conducted by means of inverse suspension polymerization.
24. The process pf claim 11 , wherein the monomer mixture is diluted with water or water/alcohol mixtures.
25. The process of claim 24 , wherein the amount of diluent varies from about 10 to about 200% by weight of the monomer mixture.
26. The process of claim 11 , wherein the polymerization temperature varies from about 50° to about 150° C.
27. The process of claim 24 , wherein the bead polymer is separated after the polymerization step.
28. The process of claim 11 , wherein the bead polymer is fractionated to adjust its particle size distribution.
29. The process of claim 28 , wherein the fractionation is accomplished by means selected from the group consisting of screening, sedimentation and air classification.
30. The process of claim 12 , wherein the contacting of the crosslinked bead polymers with an iron salt solution is accomplished by doping with superparamagnetic iron oxide in the form of aqueous mixtures of Fe+2 and Fe+3 salt solutions.
31. The process of claim 30 , wherein the Fe+2:Fe+3 molar ratio varies from about 2:1 to about 1:2, respectively.
32. The process of claim 27 , wherein the cross linked bead polymers are dried to an anhydrous state before being contacted with the iron salt solution.
33. The process of claim 32 , wherein the anhydrous, crosslinked bead polymers absorb the salt solution by swelling, with no excess iron salt solution remaining in the interstices of the beads or on the surface of the beads.
34. The process of claim 33 , wherein the iron salts absorbed by the swollen bead polymers are converted into the corresponding iron hydroxides by contacting with bases selected from the group consisting of alkaline solutions of sodium hydroxide, sodium carbonate, or ammonium.
35. The process of claim 34 , wherein the iron hydroxide is converted into iron oxide by heating the bead polymers to a temperature in aqueous suspension of about 65 to 100° C.
36. A method for isolating nucleic acids from a biological sample selected from the group consisting of cells, tissue materials, blood, and pathogens comprising:
(a) contacting the sample with a superparamagnetic bead polymers formed by the process of claim 11 , at a pH of 7.0 or below, to adsorb the nucleic acids;
(b) separating the bead polymers with the adsorbed nucleic acids by using a magnetic field;
(c) contacting the separated bead polymers with water at a pH above 7.0, thereby releasing the adsorbed nucleic acids.
37. The method of claim 36 , wherein the biological sample is disrupted to form a lysate prior to the isolation of the nucleic acids.
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DE10033583A DE10033583A1 (en) | 2000-07-11 | 2000-07-11 | Superparamagnetic polymer beads |
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PCT/EP2001/007326 WO2002004555A1 (en) | 2000-07-11 | 2001-06-27 | Superparamagnetic pearl polymers |
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- 2001-06-27 AU AU2001281904A patent/AU2001281904A1/en not_active Abandoned
- 2001-06-27 JP JP2002509413A patent/JP2004502851A/en active Pending
- 2001-06-27 WO PCT/EP2001/007326 patent/WO2002004555A1/en active Application Filing
- 2001-06-27 US US10/332,925 patent/US20050014027A1/en not_active Abandoned
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Cited By (5)
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US20050038130A1 (en) * | 2003-06-13 | 2005-02-17 | Wolfgang Podszun | Process for the preparation of iron-oxide- and/or iron-oxyhydroxide-containing ion exchangers |
US20060264521A1 (en) * | 2003-06-13 | 2006-11-23 | Wolfgang Podszun | Process for the preparation of iron-oxide-and/or iron-oxyhydroxide-containing ion exchangers |
US20100069592A1 (en) * | 2006-08-04 | 2010-03-18 | Toagosei Co., Ltd. | Process for producing polymer microparticles |
US8415433B2 (en) * | 2006-08-04 | 2013-04-09 | Toagosei Co., Ltd. | Process for producing polymer microparticles |
US20170252874A1 (en) * | 2014-09-01 | 2017-09-07 | Dowa Electronics Materials Co., Ltd. | Bonding material and bonding method using same |
Also Published As
Publication number | Publication date |
---|---|
US6590094B2 (en) | 2003-07-08 |
WO2002004555A1 (en) | 2002-01-17 |
JP2004502851A (en) | 2004-01-29 |
US20020106659A1 (en) | 2002-08-08 |
AU2001281904A1 (en) | 2002-01-21 |
DE10033583A1 (en) | 2002-01-24 |
EP1303566A1 (en) | 2003-04-23 |
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