Chemical Properties of Total Lipids and Neutral Lipids in Seeds and Endocarps of Peaches

Studies on Lipids in Seeds of Peaches Part I

Abstract

Three fractions of neutral lipids, glycolipids and phospholipids were obtained from total lipids in seeds and endocarps of two cultivars("Hakuho" and "Kurakata-wase") of peaches, Prunus persica BATSCH var. vulgaris MAXIM. by mean of silicic acid column chromatography. Further, several lipids were separated from the fraction of neutral lipids by thin-layer chromatography. Fatty acid composition of the above lipids was determined by mean of gas-liquid chromatography. The results obtained were as follows: (1) In the case of two cultivars, total lipid contents were 2.2-3.6% in seeds and 0.1-0.2% in endocarps. Neutral lipid contents in total lipids were 92.8-95.0% in seeds and 47.4-48.1% in endocarps, (2) The main lipids in neutral lipids were triacylglycerol (88.6-92.1%) in seeds, and sterols (28.2-30.5%), 1.2-diacylglycerol (15.8-15.9%), triacylglycerol (12.6-12.8%) and 1.3-diacylglycerol (10.0-14.9%) in endocarps. (3) Fatty acid compositions of total lipids, neutral lipids and several lipids (sterolesters, triacylglycerol, free fatty acids, 1, 3-diacylglycerol, 1, 2-diacylglycerol and monoacylglycerol) contained in neutral lipids fraction were remarkably dif- ferent between seeds and endocarps, but were not different between two cultivars. The main fatty acids were C_18:2, C_18:1 and C_16:0 in seeds, and C_18:3, C_16:0 and C_18:2 in endocarps.