水産皮革の理化学的研究-IX : サメ皮の膨潤について(其の一)

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概要

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• The swelling of skin, which plays a significant role in the preservation of skins and leather manufacture, was studied with the shark skin, an important raw material of marine leather. The present work deals particularly with the swelling of shark skins in acid solutions and with the dissolution of nitroge ?? ous matters the latter of which seems to serve as an index of the decomposition of hide matter. Results obtained are as follows: (1) In HCl solution, as the pH value decreased below 3.5-5, the shark skin became increasingly swollen. It seems that the pH value fluctuates depending on the history and/of nature of an individual skin, while it generally increases with the decrease of freshness in the skin (cf. Fig. 2). (2) In shark skin, the swelling and the soluble nitrogen abrurtly increased at a pH vale below about 3 (cf. Fig. 3). (3) In each solution of either HCl, H2SO4, or H3PO4, the maximum swelling of shark skin was observed at a pH value of about 2, and at that time the skin was considerably decomposed. The shark skin had the same aspect at pH 0.3-0.4 as in water, but with decreasing pH value it lost its weight. In the range of pH 0.3-3.5, the amount of soluble nitrogen vs. the pH value of the solution ran in parallel to the degree of swelling vs. the pH value. Below pH 0.3, the soluble nitrogen rapidly increased, and the skin weight decreased (cf. Figs. 4-7). (4) The effects of HCl, H2SO4, H3PO4, and CH3COOH at the same pH values on the swelling of shark skins are in the following order, CH3COOH>HCl ?? H3PO4>H2SO4. The functions of acetic acid on the swelling and dissolution of shark skin were different from those of the others (cf. Figs. 4-7). (5) The cattle hide became increasingly swollen at pH values below about 4 and attained the maximum swelling at the pH value of about 2.5, but even at this point only a small amount of the soluble nitrogen could be detected (cf. Fig. 8). (6) Comparing the swelling of skins of carp, wild goldfish, shark. and rabbit with their natural thickness, the degree of swelling was found highest with the first two. Shark skins in acid solution swelled much more than cattle hide splitted to the thickness of the former (cf. Table 3). The skin of ground shark (Carcharinus japonica) swelled in an acid solution as much as those of great blue shark (Prionace glaucus) and bomto shark (Isurus glaucus). But the amount of nitrogen dissolved from the former was much smaller than those from the latters (cf. Table 5). From the results obtained above, it may be concluded that the fish skin swells and dissolves in the acid solution much more than cattle hide. The extents in the swellin gand dissolution are likely influenced by the histological difference in animal skins, i.e. fish skin is made of a simple structure, and cattle hide made of an entangled fiber structure.

• 公益社団法人 日本水産学会の論文

著者

• 高橋 豊雄

  東海区水産研究所

関連論文

• 鯣の吸水について-I : 乾燥方法及び貯藏の影響
• 水産皮革の理化学的研究-VIII : 魚皮革の耐熱性に就いて其の三)
• イカ煮熟肉の“かたさ”について
• 水産皮革の理化学的研究-XII : 魚皮コラーゲンのハイドロオキシプロリン含有量
• 水産皮革の理化学的研究-IX : サメ皮の膨潤について(其の一)
• れん製品の研究I : サメ肉の鮮度低下とかまぼこを形成する能力について
• Physico-Chemical Studies on the Skin and Leather of Marine Animals-XI:The Tryptic Digestion of the Collagen in Fish Skin
• Physico-Chemical Studies on the Skin and Leather of Marine Animals-IV. On the Water in Shark Skin
• Physico-Chemical Studies on the Skin and Leather of Marine Animals-VI:On the Spoilage of Shark Skin

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