Immobilization of active protein by cross-linking to inactive protein
First Claim
1. A Self-supporting open-cell foam or sponge consisting essentially of a homogenous distribution of active protein and inactive protein cross-linked together with glutaraldehyde having the following properties:
- (a) surface area--103 cm2 /cm3 or, when dry, 1 m2 /g;
(b) specific gravity--0.1 when dry (including open cells);
(c) free volume--90 percent;
(d) open cell sizes--from 1 to 200 microns;
(e) capacity for water absorption--10 times its volume when starting with dry material;
(f) absorption capacity--30 percent when considering only the insoluble phase;
(g) elasticity (tension modulus)--0.4 to 0.7 kg/mm2 ;
(h) compression--0.2 to 0.9 kg/mm2, said active protein comprising up to 20 percent by weight of the total active and inactive proteins.
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Accused Products
Abstract
A solution of an active protein substance and an inactive protein substance is reacted with a cross-linking agent, optionally in the presence of an inert carrier, under cross-linking conditions to produce articles comprising both active and inactive protein substances. The active protein substance comprises up to about 20 percent, e.g. from 1 to 20 percent by weight, based on the final weight of the total protein substance, whereas the cross-linking agent comprises from 0.5 to 8 percent by weight, based on the weight of the total treated mixture. The obtained articles are in the form of a solution or a suspension in aqueous medium, in the form of a film, in the form of a membrane, in the form of a fabric, in the form of a porous material, or in the form of a mass, such as granules, pills or tablets.
71 Citations
34 Claims
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1. A Self-supporting open-cell foam or sponge consisting essentially of a homogenous distribution of active protein and inactive protein cross-linked together with glutaraldehyde having the following properties:
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(a) surface area--103 cm2 /cm3 or, when dry, 1 m2 /g; (b) specific gravity--0.1 when dry (including open cells); (c) free volume--90 percent; (d) open cell sizes--from 1 to 200 microns; (e) capacity for water absorption--10 times its volume when starting with dry material; (f) absorption capacity--30 percent when considering only the insoluble phase; (g) elasticity (tension modulus)--0.4 to 0.7 kg/mm2 ; (h) compression--0.2 to 0.9 kg/mm2, said active protein comprising up to 20 percent by weight of the total active and inactive proteins. - View Dependent Claims (28)
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2. A process for producing an immobilized active protein in the form of a self-supporting flexible sheet or film or a self-supporting open-cell foam or sponge consisting essentially of mixing
(a) active protein and (b) inactive protein simultaneously with (c) glutaraldehyde in a solvent-containing reaction medium to form a reaction mixture and reacting with active and inactive proteins with said glutaraldehyde under cross-linking conditions until the active protein is cross-linked with the inactive protein through bridges provided by the glutaraldehyde to form said sheet, film, foam or sponge, said active protein comprising up to 20 percent by weight of total active and inactive proteinic substance and said glutaraldehyde being in the range of from 0.5 to 8 percent by weight, based on the weight of total reaction mixture, said sheet or film being formed by spreading said reaction mixture on a surface before cross-linking and said foam or sponge being formed by freezing and slowly thawing said reaction mixture during said cross-linking.
Specification