Physico-Chemical Studies on the Skin and Leather of Marine Animals-VI:On the Spoilage of Shark Skin

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Intending to establish the criterion of putrefaction of a green shark skin, we have carried out research on volatile bases (V. B.), volatile fatty acids (V. F. A.), and trimethylamine (T. M. A.) to be formed in the course of spoilage of the green skin. Then the first two were compared with these formed in the washed skin. In addition, shrinkage temperature (Ts) that lowers in the green skin just as the spoilage proceeds has been observed for the same purpose. The results obtained are shown in Figures 1 to 3 where fluctuations of the chemical properties, bacterial counts as well as shrinkage temperature are indicated with respective symbols, in solid lines for the test A, and in a broken lines for the test B. As evident from Figure 2, an abrupt change in the value of each item was observed together with a sharp decrease of Ts at a certain time between 8th to 11th day of the test A, and between 5th to 6th day of the test B. It appears for us that in the early course of the spoilage prior to the abrupt change, extractive matters (mainly urea) in the skin are decomposed by bacteria. However, the hide substance (collagen) which has remained being hardly affected at that time, is seriously degraded by bacteria in the later course. For this reason we have reached a conclusion that in case of green shark skin, fluctuations of V. B., T. M. A., V. F. A. in amount, and of Ts in degree, cannot be used as the criterion of bacterial degradation of the hide substance. In other words, a green shark skin is not a suitable material for preservation experiments of shark skin. It is proposed that a washed skin can be conveniently used in the spoilage experiments, however.
社団法人日本水産学会の論文

Physico-Chemical Studies on the Skin and Leather of Marine Animals-VI:On the Spoilage of Shark Skin

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