초록 ▼

A porous formed composite material comprising: (i) a polymer, or a mixture thereof, said polymer having immobilised therein (ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or copolymer b

A porous formed composite material comprising: (i) a polymer, or a mixture thereof, said polymer having immobilised therein (ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or copolymer being optionally mixed with silica gel; and (b) polyvinyl lactam-modified silica gel; is described. Solid phase extraction apparatus incorporating the material and its use in removing polyphenols and/or proteins from beverages to prevent the formation of haze in beverages are also described.

대표청구항 ▼

1. A porous formed composite material comprising: (i) a polymer selected from polyethylene, polypropylene, and a mixture thereof, and:(ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or c

1. A porous formed composite material comprising: (i) a polymer selected from polyethylene, polypropylene, and a mixture thereof, and:(ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or copolymer being optionally mixed with silica gel; and(b) polyvinyl lactam-modified silica gel;the formation process causing the polymer (i) and insoluble sorbent material (ii) to be formed into a rigid unitary body such that the insoluble sorbent material is immobilised into the structure of the rigid unitary body. 2. A porous formed composite material according to claim 1, containing 2% to 38% by weight of the insoluble sorbent material (ii). 3. A porous formed composite material according to claim 1, containing 3% to 25% by weight of the insoluble sorbent material (ii). 4. A porous formed composite material according to claim 1, wherein the insoluble sorbent material (ii) is a cross-linked homopolymer or copolymer of vinyl pyrrolidone. 5. A porous formed composite material according to claim 4, wherein the insoluble sorbent material (ii) comprises polyvinyl polypyrrolidone (PVPP). 6. A porous formed composite material according to claim 5, wherein the degree of cross-linking of the PVPP is such that between 60% and 100% of the PVPP is insoluble. 7. A porous formed composite material according to claim 5, containing 2.5% to 35% by weight of polyvinyl polypyrrolidone. 8. A porous formed composite material according to claim 1, wherein the insoluble sorbent material (ii) comprises polyvinyl pyrrolidone-modified silica gel. 9. A porous formed composite material according to claim 8, containing 2.5% to 35% by weight of the polyvinyl pyrrolidone-modified silica gel. 10. A porous formed composite material according to claim 1, wherein the insoluble sorbent material (ii) comprises a mixture of silica gel and polyvinylpolypyrrolidone. 11. A porous formed composite material according to claim 10, wherein the insoluble sorbent material (ii) contains from 0.25% to 31.5% by weight of silica gel and 31.5% to 0.2% by weight of polyvinyl polypyrrolidone. 12. A porous formed composite material of claim 1, wherein the material has a shape selected from a frit, a sheet, a disc or a roll. 13. A solid phase extraction apparatus comprising the porous formed composite material of claim 1. 14. A method of manufacturing the porous formed composite material, the method comprising mixing: (i) a polymer selected from polyethylene, polypropylene, and or a mixture thereof, and:(ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or copolymer being optionally mixed with silica gel; and(b) polyvinyl lactam-modified silica gel;to form a rigid unitary body wherein the insoluble sorbent material is immobilized into the rigid unitary body. 15. A method of removing a substance selected from a polyphenol, a polypeptide and a protein from a beverage, the method comprising passing the beverage through a porous formed composite material comprising: (i) a polymer selected from polyethylene, polypropylene, and a mixture thereof, said polymer having immobilised therein:(ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or copolymer being optionally mixed with silica gel;(b) polyvinyl lactam-modified silica gel; and(c) silica gel. 16. A method according to claim 15, wherein the substance removed from the beverage is a polyphenol. 17. A method according to claim 16, wherein the polyphenol removed from the beverage is a tannoid and/or a flavonoid. 18. A method of preventing the formation of haze in a beverage, the method comprising passing the beverage through a porous formed composite material comprising: (i) a polymer selected from polyethylene, polypropylene, and a mixture thereof, said polymer having immobilised therein(ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said homopolymer or copolymer being optionally mixed with silica gel;(b) polyvinyl lactam-modified silica gel; and(c) silica gel. 19. A method of removing a metal ion from a solution, the method comprising passing the solution through a porous formed composite material comprising: (i) a polymer selected from polyethylene, polypropylene, and a mixture thereof, said polymer having immobilised therein:(ii) an insoluble sorbent material selected from the group consisting of: (a) a cross-linked vinyl lactam homopolymer or copolymer, said vinyl lactam homopolymer or copolymer being optionally mixed with silica gel;(b) polyvinyl lactam-modified silica gel; and(c) silica gel. 20. A method according to claim 19, wherein the metal ion is an iron ion.