Chemistry: natural resins or derivatives; peptides or proteins; – Proteins – i.e. – more than 100 amino acid residues – Scleroproteins – e.g. – fibroin – elastin – silk – etc.
Patent
1989-04-12
1992-03-03
Schain, Howard E.
Chemistry: natural resins or derivatives; peptides or proteins;
Proteins, i.e., more than 100 amino acid residues
Scleroproteins, e.g., fibroin, elastin, silk, etc.
530354, 530857, 426576, C07K 302, C09H 300, C09H 302
Patent
active
050934740
ABSTRACT:
A process for the production of gelatin from fish skins comprises the steps of: (a) cleaning the skins in order to remove therefrom substantially all superfluous material; (b) treating with dilute aqueous alkali; (c) washing with water until the washing water is substantially neutral; (d) treating with dilute aqueous mineral acid; (e) washing with water until the washing water is substantially neutral; (f) treating with dilute aqueous citric acid and/or another suitable organic acid; (g) washing with water until the washing water is substantially neutral; and (h) extracting with water at elevated temperatures not above about 55.degree. c., the washed citric acid-treated skins. In practice, the present process employs much lower temperatures than known heretofore for the treatment steps, which results in a high quality product (e.g. absence of a fishy smell), compared with the prior art.
REFERENCES:
patent: 2024683 (1932-05-01), Epstein et al.
Japanese Government Patent Office, Patent Abstracts of Japan 11 May 1989, C Field.
Kernot and Speer (Dept. Sci. Ind. Research) 2nd Report of the Adhesive Research Committee, 1926, pp. 23-33.
Bergman Margalit
Grossman Shlomo
Bar Ilan University
Koh Choon P.
Schain Howard E.
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