著者

須山 三千三 徳廣 眞 須山 善雄

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.16, no.5, pp.211-214, 1950-10-25 (Released:2008-02-29)

参考文献数

16

被引用文献数

1 5

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Respectively by the xanthydrol method9, 12) and the WEBER-WILSON's method, we have determined the amounts of urea and ammonia (calculated from the amounts of volatile basic nitrogen) in 100 grams of the muscle of shark-fishes as shown in Table 1. When the muscle of Prionace glauca (LINNÉT) is caused to decay at 35°C, the contents of urea was decreased quickly by linear function and after 48 hours all urea was decomposed by the urease of the bacteria. On the other hand, the formation of ammonia was much slower in the early stage of putrefaction as compared to the ammonia calculated from the decreasing amounts of urea, but was more rapidly in the later stage (Fig. 1). At the room temperature of winter (9±2°C), a similar tendency was observed (Fig. 2). As demonstrated by YAMASAKI15) and SUMNER16), we assumed that an intermediate product will be formed in the enzymatic hydrolysis of urea, at least in the limit of this experiment.