Abstract:
The invention relates to a process for preparing beadlets containing fat soluble substances in a gelatin matrix which comprises crosslinking the gelatin by radiation or enzymatically. Specifically, the invention relates to a process for preparing beadlets containing fat soluble substances having the steps of: (1) forming an aqueous emulsion of a fat soluble substance, a gelatin, a reducing agent; (2) converting the emulsion into a dry powder; and (3) crosslinking the gelatin matrix in the coated particles by exposing the coated particles to radiation or, in the case of a crosslinking enzyme being present, by incubating the coated particles.
Abstract:
A transparent native, non-fibrilized collagen material is described having an absorbence at a wavelength of 900 nm of less than 5% in a sample 5 mm thick. This collagen material is useful for a prosthetic replacement of the cornea because of the high transparency and because it is a native material, and thus less susceptible to immunogenic responses. A method for forming the native, non-fibrilized, highly transparent collagen material comprises ultracentrifuging a purified solution of native collagen to form a pellet of transparent collagen material, and fixing the pellet of collagen material to form a rigid, leather-like material. The collagen material can also be used for prosthetic replacement of other bodily tissues, such as nucleus pulposus, cartilage, and vitreous body.
Abstract:
Proteinaceous material such as gelatin is hardened by treatment with an aqueous solution of the partial hydrolysis product of a 2,4-dichloro-6-alkoxy-S-triazine with a water-soluble tertiary phosphate and/or a water-soluble borate, wherein the 2,4-dichloro-6-alkoxy-s-triazine corresponds to the formula: ##STR1## wherein R is a lower alkyl or alkoxyalkyl group. The proteinaceous material can be a proteinaceous coating such as a photographic silver halide emulsion layer, a backing layer, a protective layer, a filter layer, or any other photographic auxiliary layer.
Abstract:
Chemically modified dialdehyde polysaccharides are used as gel strength enhancers for gelatin compositions. These modified polysaccharides are particularly useful as gel strength enhancers for gelatin compositions which have been extended with starch or dextrin.
Abstract:
POLYERIC CCMULSIONS ARE HARDENED BY CROSSLINKING WITH MULTIVALENT CATIONS THAT ARE INITIALLY PRESENT IN THE EMULSIONS IN THE FORM OF COMPLEXES WITH COMPLEXING AGENTS. HARDENING OF THE EMULSIONS OCCURS WHEN THE CROSSLINKING CATIONS ARE RELEASED FROM THE COMPLEXES, E.G., BY DISPLACEMENT WITH OTHER CATIONS.
Abstract:
A biomaterial suitable for use in medical devices which comprises peritoneal tissue, especially animal parietal peritoneum tissue, which has been chemically treated to crosslink the collagen in the tissue.
Abstract:
A hardened gelatin and a method for obtaining the hardened gelatin are described, using at least one compound represented by formula (I) ##STR1## wherein all symbols are as defined in the appended claims. The compounds of formula (I) are high in hardening speed and cause little or no post-hardening. Thus these compounds are very useful, for example, in preparation of a light-sensitive material.
Abstract:
Aldehyde cross-link intermediates and cross-links are generated in the central helical portion of collagen by incubating collagen with pyridoxal-5-phosphate and either cupric copper ion or ferrous iron ion. The cross-links are chemically similar to natural cross-links found in the non-helical regions and are directly between amino-acid moieties naturally occuring in the central helical portion of collagen. Cross-linking and utilization of aldehyde intermediates occurs when the product is reincubated after pyridoxal is removed. Alternatively maintaining the product at body temperatures will promote cross-linking. The cross-linked collagen product has increased resistance to enzyme degradation.
Abstract:
Compounds represented by the following general formula are used as hardeners for gelatin, in particular gelatin layers of photographic light sensitive materials ##STR1## (wherein R and X are the same as defined in the specification).