魚肉腐敗の化學的研究 : (第2報)腐敗生産物に対する外圍條件の影響

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We studied decomposition products of cod muscle which putrefied under various condition by changing air quantity, pH of medium. (cod muscle were incubated at 30°C for 12-14days.) 1. In anaerobic conditions (keeping in vaccum), the pH increase of medium was very slow and after 14 days pH of medium was 6.8 (cf. in aerobic condition 7. 8. see Part 1. Table 1. 2.) The decomposition products were similar to those of aerobic condition inoppearan (Table 2.), but volatile fatty acid obtained in this case was conpased of butyric acid chiefly. (Table 3, 4.) 2. In much aerobic condition by aerating for 8 hours a day during putrefaction, the decomposition of muscle were accelerated and remarkable decreases of insoluble matter and muscle weight were noticed. (Table 5.) 3. In acidic condition (keeped pH of medium 4.5-5.0 by addition of H2SO4, H3PO4 and lactic•acid), it seems decomposition of muscle was inhibited, and a remarkable decrese in production of volatile fatty acid was noticed. (Table 6. 7. 8.) 4. In alkalic condition (keeped pH of medium 8.5-9.0 by addition of NaOH and Na2CO3), we observed no remarkable influence on the decomposition products. (Table 9.) 5. When added such carbohydrates as glucose and glycerol, medium became progressively acidic, and definite influences were not observed. (Table 11.)