Abstract:
The present invention relates to a process for cross-linking of highly porous foams of S- sulfonated keratin, and to highly porous, cross-linked keratin foams (e.g. scaffolds) as such. Such scaffolds (foams) are particularly useful for wound care applications. Such porous keratin foams can be obtained through exchanging the aqueous solution of the reductant as the cross-linking media with an alcohol solution of the same reductant, and by exchanging the aqueous washing procedures with a similar alcohol washing procedure.
Abstract:
A putty form biomaterial composition made of a collagen scaffold and ceramic granule having improved flowable yet cohesive characteristics through the addition of, either individually or in some combination, polyhydroxy compounds, a liquid polyhydroxy compound ester, a liquid solution of solid polyhydroxy compound, a liquid solution of solid polyhydroxy compound ester to allow for use in surgical bone repair is presented. Specific polyhydroxy compounds, including polyethylene glycol polymers (PEG), PPO/PEO block co-polymers (i.e., a poloxamer NF grade), and the polysaccharides alginate and chitosan may be utilized.
Abstract:
The present invention relates to new fluorinated quaternary ammonium compounds of formula (1) and (5), to new fluorinated proteic hydrolisates, to processes for their preparation and to fire-fighting compositions that contain said compounds against fires originated from both apolar and polar hydrocarbon liquids.
Abstract:
The invention provides a new collagen based technology. The invention provides a dry collagen powder as a precursor for the preparation of an homogeneous thermoplastic collagen-based composition, which may further comprise additives. The present invention relates also the use of said composition in the manufacturing of solid articles conformed according to plastic technology, and to the articles.
Abstract:
This Invention Patent regards an Extraction Process of Hydrolyzed Collagen and of Chrome/Collagen Complex from Chrome Tanned Leather Residues from enzymes, where, in the first process, use is made of the JOANA FÉLIX-1H Enzyme and the JOANA FÉLIX-2H Enzyme, while in the second process the JOANA FÉLIX-1C Enzyme is used. The technique is based on the preparation of Liquid Hydrolyzed Collagen, Hydrolyzed Collagen in the form of Viscous Liquid, Dry Hydrolyzed Collagen, Solid Hydrolyzed Collagen, Chrome/Collagen Complex Paste, Dry Chrome/Collagen Complex and Solid Chrome/Collagen Complex. The Hydrolyzed Collagen can be used in the food, pharmaceutical, cosmetic, animal food, glue, adhesive, photograph, fertilizer, plastic, rubber, leather industries, industries of chemical products for tannery and in various segments of the chemical industries. The Chrome/Collagen Complex Paste can be used in various segments of the chemical industries.
Abstract:
The invention relates to polyamide-based water-soluble biodegradable copolymers and containing at least one graft lateral chain consisting of aldehydes and sulphurous acids and the salts thereof and eventually of at least one of the following compounds: ketones, aromatic alcohols, (derivatives of) urea and amino-s-triazines. Used polyamide-type compounds are preferably embodied in the form of natural polyamides like caseins, gelatines, collagens, bone glue, serum albumins, and soybean proteins or the degradable products thereof, and synthetic polyamides such as aspargic acids or copolymers of aspartic and glutamic acids. The inventive copolymers are, in particular produced by graft polymerisation at a temperature ranging form 10 DEG C to 250 DEG C, preferably in the presence of a solvent like water, and by heat drying. Said copolymers are in particular used in the form of a solvent or a water-retaining agent for inorganic binders and pigments. Said copolymers are especially characterised in that they slightly delay setting when associated with hydraulic binding matters.
Abstract:
Methods for chemically modifying peptides, preferably keratinaceous feedstocks, to achieve desired solubility characteristics; stable solvent systems for preparing the modified peptides; and the resulting chemically modified peptides.
Abstract:
A method for preparing cross-linked collagen, and cross-linked collagen products. The method includes incubating collagen in a solution including water, at least one polar solvent and at least one sugar, to form cross-linked collagen. The accompanying figure shows the effect of treatment with reducing sugar (D-ribose) and alcohol on particulate collagen degradation by bacterial collagenase. The solution may include a buffer having a suitable pH and ionic strength. The method may include removing excess unreacted sugar(s) and polar solvent(s) by washing the cross-linked collagen or by other methods. The method may also include dehydrating the cross-linked collagen, and may include subjecting the cross-linked collagen to critical point drying, or subjecting the collagen to drying or freeze-drying prior to cross-linking. The collagen may be prepared from atelopeptide collagen to reduce antigenicity, but may also be prepared from other suitable collagen types. The concentration and type of the polar solvent(s), the concentration and type of the reducing sugar(s), and the incubation duration may be varied to control the degree of cross-linking. The cross-linked collagen product may be in the form of a wet or dry matrix or membrane or may be suspended in a liquid in the form of an injectable preparation. The method may be applied to collagenous proteins and collagen-like peptides.
Abstract:
A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract. Since the various polymer blends of the present invention are not covalently or ionically crosslinked, but are physically combined, each polymer in the physical blend maintains its original chemical structure, and therefore, is safe for oral or other routes of administration.