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
1994-03-08
1996-01-16
Wityshyn, Michael G.
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, 426 32, 426576, C07K 14435, C07K 114, A23J 306
Patent
active
054848881
ABSTRACT:
Gelatin, having high Bloom or gel strength in excess of 300, is extracted from fish, with high yield, by pre-treating collagen rich fish skins with a limewater (Ca(OH).sub.2) solution suspension with a concentration of between 19 gm of Ca(OH).sub.2 /liter of water/kg of tilapia fish skin to 100 gm Ca(OH).sub.2 /liter of water/kg of fish skin for a period of time between ten to sixty days and optimally between two to four weeks. For fish with higher percentage of fat content, a minimum concentration is at least 50 gm of Ca(OH).sub.2 /liter of water/kg of fish skin to avoid putrefaction. For fish with easily extractable gelatin, such as Nile perch, soaking time is from 3 to 10 days with a concentration of Ca(OH).sub.2 /liter of water of about 15 gm. At concentrations above 100 gm of Ca(OH).sub.2 /liter of water/kg of fish skin and/or treatment time periods in excess of four weeks, Bloom strength dramatically decreases. Acid treatment followed by additional limewater treatment restores Bloom strength lost by excessively long initial limewater treatment.
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Hamada "Effects of the Preparation Conditions on The Physical Properties of Shark-Skin Gelatin Gels" Abstract Bull Jap Soc. Sci Fish. 56(4) 1990 671-677.
Kim et al. "The Suitable Processing Conditions for Gelatin Preparation from Dover Sole Skin" Abstract J Korean Agr. Chem. Soc. 36(6) 1993 440-448.
Degen Nancy J.
Nissenbaum Israel
Wityshyn Michael G.
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