Lipid content and fatty acid composition in lemon wax.
Lipids were extracted from lemon wax and fractionated into four classes on a silicic acid glass packed column by thin-layer chromatography (TLC). The free fatty acids, the fatty acid composition and the amount of each separated lipids were determined by capillary column gas chromatography (GC). Total lipids (TL) were 60 mg per 100 g raw weight and the ratio of nonpolar lipids (NPLs): glycolipids (GLs): phospholipids (PLs) was about 47:2:2. The main free fatty acids in lemon wax were hexadecanoic acid, cis-9-octadecenoic acid and cis,cis-9,12-octadecadienoic acid, while in the lipid fractions the main fatty acids were hexadecanoic acid in all the fractions, cis-cis-9,12-octadecadienoic and decanoic acids in triglyceride (TG) fraction, dodecanoic and cis-9-octadecenoic acids in diglyceride (DG) fraction and tetradecanoic, octadecanoic and cis-9-octadecenoic acids in GL and PL fractions. The ratio of unsaturated to saturated fatty acids showed a remarkable difference among these four lipid fractions. In PL and GL fractions this ratio was similar, 47.7% and 47.1% respectively, and in TG fraction it was 42.4% while in DG fraction this value was 23.5%.
Russo
Mario Vincenzo
MV
Facoltà di Agraria (DiSTAAM), Università del Molise Via De Sanctis, 86100 Campobasso (CB), Italy. mvrusso@unimol.it
D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D002957:Citrus / Q000737:chemistry*; D005227:Fatty Acids / Q000032:analysis*; D008055:Lipids / Q000032:analysis*; D014885:Waxes / Q000737:chemistry
D005227:Fatty Acids; D008055:Lipids; D014885:Waxes