脂油の酸化防止に關する研究 : (第1報)オレイン酸メチルエステルの自己酸化に對する硫黄化合物の影響に就て

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To discover new, useful antioxidants for fats and oils, we selected the sulfur-containg compounds as antioxidants and methyl oleate as the substrate. To compare the effectiveness of used reag-ents, we examined the quantities of oxygen uptake using the Warburg respirometers at 30°. As sulfur-containing compounds, thiourea and its related substances were used such as S-methyl-isothiourea sulfate, phenylthiourea, N, N-diphenylthiourea, sym.-diphenylthiourea, tetraphenyl-thiourea, rubeanic acid, thioanilide, rhodamine, mercaptobenzothiazole, thiophenol, cysteine, cystine, thioglycolic acid, thioacetic acid, anhydrous sodium sulfite and sodium thiosulfate. The following results were obtained: 1) Among these sulfur-containing compounds, sym.-diphenylthiourea, S-methylisothiourea sulfate and anhydrous sodium sulfite inhibited the autoxidation almost completely, while thiourea, N-phenylthiourea and thioanilide showed rather remarkable accerelation for autoxidation. 2) Comparing the action of sym.-diphenylthiourea with that of hydroquinone, the normal antioxidant, the former showed higher effectiveness under our experimental conditions. 3) Although thiourea promoted the autoxidation markedly, urea inhibited the autoxidation distinctly. 4) In these experiments, no general relations were found between the effectiveness of antioxid-ants and the chemical constitutions of sulfur-containing compounds beyond expectation.
社団法人日本農芸化学会の論文