Abstract
The acetone-soluble lipid was obtained in the yield of 2.70% from the dark-colored muscle of tuna. This lipid had the properties as shown in Table 1. The composition of the mixed fatty acids was found to be as shown in Table 9. The unsaponifiable matter contained 25.46% of sterols, consisting mainly of cholesterol, in which no detectable amount of provitamin D was found. It was also shown that this lipid contained of less saturated acids, more long-chain polyethylenic acids and more cholesterol than the acetone-soluble lipid of the ordinary muscle.
