抽出溶剤による酸化油の性状の差異について

概要

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To study the chemical and physical change of liver oil during a process of oxidation, sample oil was oxidized in air at 45°C. with sea-sand, extracted at certain intervals with various solvents as illustrated in the Tables 1-7. As in shown in the tables, in the earlier stage of oxidation, the properties of oils differ little depending on the solvent. In the advanced stage of oxidation, however, remarkable difference was observed in properties of oil depending on the solvent used for the extraction. Another experiment was done on the samples oxidized for 4 and 7 days, to observe the effect of heat on the nature of the oil during the evaporation of solvent. Considerable differences were found between a oil extracted at room temperature and the one refluxed with sol-vent at boiling temperature for four hours. As in shown in Table 8, increase in acid value, saponification value, oxidized acid and refluctive index, and decrease in iodine value and peroxide value were confirmed to occur by heat treatment. It is concluded that to obtain true data on an oxydized oil the solvent should be removed under vacuum at room temperature.
社団法人日本水産学会の論文