Loading of biologically active solutes into polymer gels

{
  "publication_number": "US5840338A",
  "country": "US",
  "kind": "A",
  "title": "Loading of biologically active solutes into polymer gels",
  "abstract": "Polymer gel networks loaded with biologically active solutes in a manner that solute activity is maintained and protected from thermal and/or chemical degradation while in the gel network are provided. The invention also provides for effects of modulating parameters for loading safe responsive gel networks using loading solutions containing phase separating polymers.",
  "claims": [
    "1. A method of loading a biologically active solute into a crosslinked polymer gel network, comprising: selecting the crosslinked polymer gel network; forming a loading polymer solution, the loading polymer solution comprising a loading polymer, a salt and the biologically active solute, the lading polymer solution having a pH above the isoelectric point of the biologically active solute; and contacting the crosslinked polymer gel network with the loading polymer solution under conditions sufficient for at least a portion of the loading polymer solution to partition into the gel network and for at the biologically active solute to retain activity while in the gel network.",
    "2. The method of claim 1, wherein the crosslinked polymer gel network is biodegradable.",
    "3. The method of claim 1, wherein the crosslinked polymer gel network is a polysaccharide polymer gel.",
    "4. The method of claim 3, wherein the crosslinked polysaccharide polymer gel network is hydroxypropyl cellulose crosslinked with adipic acid.",
    "5. The method of claim 3, wherein the biologically active solute is a protein.",
    "6. The method of claim 5, wherein the protein is an enzyme.",
    "7. The method of claim 6, wherein the enzyme is peroxidase.",
    "8. The method of claim 6, wherein the enzyme is suitable for use in blood panel diagnostics.",
    "9. The method of claim 6, wherein the enzyme is suitable for use in bioremediation.",
    "10. The method of claim 9, wherein the enzyme is tricloroethane.",
    "11. The method of claim 1, wherein the biologically active solute includes hepatitus B surface antigen.",
    "12. The method of claim 6, wherein the enzyme is a hydrazine degrading enzyme.",
    "13. The method of claim 1, wherein the loading polymer comprises polyvinyl alcohol.",
    "14. The method of claim 13, wherein the biologically active solute comprises peroxidase.",
    "15. The method of claim 13, wherein the salt comprises potassium iodide.",
    "16. The method of claim 15, wherein the biologically active solute comprises peroxidase.",
    "17. The method of claim 13, wherein the salt comprises potassium fluoride.",
    "18. The method of claim 17, wherein the biologically active solute comprises peroxidase.",
    "19. The method of claim 1, wherein the loading polymer comprises polyoxyalkylene derivatives of propylene glycol.",
    "20. The method of claim 1, wherein the portion of the loading solution that partitions into the gel network comprises the biologically active solute.",
    "21. A method of loading a biologically active solute into a crosslinked polymer gel network, comprising: selecting the crosslinked polymer gel network; forming a loading polymer solution, the loading polymer solution comprising a loading polymer, a salt and the biologically active solute, the loading polymer solution having a pH below the isoelectric point of the biologically active solute; and contacting the crosslinked polymer gel network with the loading polymer solution under conditions sufficient for at least a portion of the loading polymer solution to partition into the gel network and for the biologically active solute to retain activity while in the gel network.",
    "22. The method of claim 21, wherein the loading polymer comprises polyoxyalkylene derivatives of propylene glycol.",
    "23. The method of claim 22, wherein the biologically active solute comprises peroxidase.",
    "24. The method of claim 22, wherein the salt comprises potassium iodide.",
    "25. The method of claim 24, wherein the biologically active solute comprises peroxidase.",
    "26. The method of claim 22, wherein the salt comprises potassium fluoride.",
    "27. The method of claim 26, wherein the biologically active solute comprises peroxidase.",
    "28. The method of claim 21, wherein the crosslinked polymer gel network comprises a crosslinked polysaccharide gel network.",
    "29. The method of claim 21, wherein the portion of the loading solution that partitions into the gel network comprises the biologically active solute."
  ],
  "cpc": [
    "A61K 8/042",
    "A61K 2800/54",
    "A61L 15/32",
    "A61L 15/38",
    "A61L 15/44",
    "A61L 15/60",
    "A61L 2300/254",
    "A61L 2300/404",
    "A61Q 13/00",
    "A61Q 19/00",
    "C12N 2533/30",
    "C12N 2533/78"
  ],
  "filing_date": "1995-11-06",
  "publication_date": "1998-11-24",
  "grant_date": "1998-11-24",
  "priority_date": "1994-07-18",
  "application_number": "US-55613095-A",
  "family_id": "26957840",
  "citations": [
    "EP0178665A2",
    "GB2177708A",
    "JPH05239263A",
    "US3077468A",
    "US3379720A",
    "US3458622A",
    "US3993553A",
    "US4002173A",
    "US4004997A",
    "US4172066A",
    "US4428972A",
    "US4462982A",
    "US4474751A",
    "US4474752A",
    "US4555344A",
    "US4881798A",
    "US5093030A",
    "US5252318A",
    "US5259998A",
    "US5395620A",
    "WO9213566A1",
    "WO9319095A1",
    "WO9319115A1"
  ]
}