亜硝酸水溶液と接触する不飽和油脂および不飽和脂肪酸の過酸化速度に影響する諸因子 : 細菌による油脂の過酸化(第8報)

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It has previously been reported that the peroxidation of soybean oil was accelerated when it was in contact with a nitrite solution. In the present study, varying the reaction conditions, the peroxidation processes of unsaturated substrates were followed iodometrically. The substrates used were triglycerides, the native and tocopherol-free soybean oils, and a mixture of fatty acids, the lipase hydrolysate of the tocopherol-free soybean oil. The peroxide values (POV) of the substrates were increased rapidly after induction periods of various lengths, during which the POV of the triglyceride was increased gradually but that of the fatty-acid mixture was scarcely changed. The length of the induction period was shortened by increasing the concentration of the nitrite solution, by lowering the pH of the solution, and by increasing area of the substrate-nitrite solution interface which was attained by dispersing the substrate into the nitrite solution, and was elongated by the addition of α-tocopherol to the substrate. The effect of nitrite appeared more intensely on the peroxidation of the fatty-acid mixture than on that of the triglyceride. The maximal POV observed during the peroxidation processes of the triglyceride and the fatty-acid mixture were about 1500 and 500 m-equiv./kg in the heterogeneous reaction systems and about 800 and 400 m-equiv./kg in the emulsified systems.
社団法人日本生物工学会の論文
1973-07-25