Abstract
Acid-soluble collagens (ASCs) were extracted from the skins of several underutilised fishes, namely dusky spinefoot ( Siganus fuscescens), sea chub ( Kyphosus bigibbus), eagle ray ( Myliobatis tobijei), red stingray ( Dasyatis akajei) and yantai stingray ( Dasyatis laevigata). The yields of the ASCs from skins of dusky spinefoot and sea chub were about 3.4–3.9%, and from ray species were about 5.3–5.7%, on a dry weight basis. According to the electrophoretic pattern, ASCs consisted of two different α-chains (α1 and α2) and were classified as type I collagen. However, the molecular weights of α2-chain for ray species were lower than those of bony fishes. ASC from ray species contained a higher content of imino acids than those from dusky spinefoot and sea chub. The denaturation temperatures ( T d) of ray species were about 33 °C, which was about 5 °C higher than those of dusky spinefoot and sea chub. The high T d of ray species suggested the possibility of its utilisation as a substitute for mammalian collagen.
Published Version
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