Abstract
Upon experiment the vitamin A content in liver oils of Somniosus pacificus (Ondenzame) and Heteroscymnus longus (Kaeruzame) have been found much higher than those of other species of deep sea sharks (Table 1, 2). By molecular-distillation of the liver oil of the specimens under a suitable condition, hydrocarbon and vitamin A were well fractionated (Table 3, 4 and Figs. 1-4). The amount of vitamin A was found to increase through molecular-distillation of the liver oils of Centrophorus sp. (Aizame), Centroscymnus owstoni (Yumezame), Centrophorus sp. (Kindenzame) and mixed liver oil of various deep sea sharks (Table 5). Adsorption coefficient of these oils became larger by the distillation; maximum of adsorption curve drawn according to the difference between before and after the distillation agreed with that of vitamin A (Figs. 5-8). It is supposed that these liver oils contain some materials like kitol.
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