Lipids, extracted with chloroform-methanol (2:1 by vol.) and purified, from nut and leaf of Ginkgo biloba were identified and quantitatived by column, thin layer and gas liquid chromatography. The results were summarized as follow:
1) The total content of purified lipids in the nut and leaf on the fresh weight basis were 1.32% and 2.24%, respectively.
2) The lipid fractions in the nut obtained by silicic acid colum chromatography were found to be composed of about 89% neutral lipids and about 10% compound lipids, and in the leaf were found to be composed of about 28% neutral lipids and about 72% compound lipids.
3) Among the neutral lipid fractions, triglycerides (86.2%) were the major component in the nut, but esterified sterols (53.3%) were the major component in the leaf.
4) The main fatty acids of the total lipids were oleic(37.5%) and linoleic acid(44.5%) in the nut, but linolenic(45.2%) and palmitic acid (25.1%) were main fatty acids in the leaf. The patterns of fatty acid composition of the neutral lipid fractions in the nut and leaf were found to be similar, and oleic, linoleic and palmitic acid were the predominant.
A large amount of oleic and linoleic acid in the glycolipid fractions was found in the nut compared with those in the leaf, but linolenic acid content in the leaf was significantly higher than in the nut. And patterns of fatty acid composition of the phospholipid fractions in the nut and leaf were found to be similar to that of glycolipid fractions.
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