Free and bound lipids of both inner and outer part in the edible portion of 3 varieties of chestnuts(Castanea crenata) were extracted and fractionated into neutral lipid, glycolipid and phoepholipid, by silicic acid column chromatography. Fatty acid composition of each fraction was examined with gas chromatography.
Lipid contents in chestnut on dry weight basis were 1.84% in inner part(1.26%-free lipid and 0. 58% bound lipid) and 1.95% in outer part (1.63%-free lipid and 0.32%-bound lipid). Free lipid content was 2～5 times higher than bound lipid content and was more abundant in the outer part. Neutral lipid content of the free lipid in the inner part was 39.5%, approximately 10 times as much as that of the bound lipid, but in the outer part, the former was 56.6%. Glycolipid content was 22. 0% in the free lipid and 17.0% in the bound lipid. Phospholipid content was 6.9% in the free lipid and 10.5% in the bound lipid. The predominant fatty acids were linoleic acid, palmitic acid and linolenic acid in the free lipid, and palmitic acid, linoleic arid and linolenic acid in the bound lipid, Therefore, saturated fatty acid content in the bound lipid was 2 times higher than in the free lipid.
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