ヌカ油利用の研究 (第7報)

圧搾法と溶剤抽出法との比較

抄録

Authors discussed the mechanism of oil separation from the tissue of rice bran by comparing the expression and the solvent extraction method, from differences in their properties of extracted and remained oils.
Assuming here that the main components of rice bran oil are free fatty acids, glycerides and wax esters, the wax esters are firstly separated and the free fatty acids follow in the expression method. Whereas, there are reverse selective tendency in the solvent extraction. However, industrial data shows that the differences and elevation in the acid value of crude oil by both methods are small.
It is generally said that the extracted crude rice bran oil is more difficult for refining than the expressed oil, but, authors found the reverse case when extraction temperature was controlled and extraction was processed by separating steps.