Comparison of the physico-chemical properties of shark skin collagen and of pig and bovine skins
1996
Yoshimura, K. (Tokyo-to. Leather Technology Center (Japan)) | Hozan, D. | Chonan, Y. | Shirai, K.
Collagen fibrillar network and physico-chemical properties including the reactivity of functional groups, swelling properties and thermal characteristics determined by differential scanning calorimetry of shark (Great Blue Shark) skin collagen were compared with those of pig and bovine skins. Observation on scanning electron microscope results showed that the significant features of shark skin were the looser and thinner collagen fibrillar bundles in the middle layer of corium composing the main part of skin. The total uronic acid content in shark skin collagen was the largest, while its fraction extracted with a neutral buffer solution was the smallest. This suggested that shark skin collagen associates with proteoglycans more strongly than other kinds of collagen. From pH-titration curves, no significant difference in the maximum combined amount of hydrogen and hydroxyl ions among the three kinds of collagens was observed and the combined amount in neutral and weak acidic pH regions was larger for shark skin collagen than for the other collagens. Shark skin collagen exhibited a strong swelling ability, especially in the acidic pH region. There was no difference in the denaturation temperature at various pH between pig and bovine skin collagen, while shark skin collagen exhibited a significantly lower denaturation temperature,with a certain degree of rise in the denaturation temperature in alkaline region
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