Effects of different diets on fatty acid composition of Trogoderma granarium (Coleoptera:Dermestidae) larvae and adults

In this study, it is focused on the change of the fatty acid composition in phospholipid and triacylglycerol fractions of Trogoderma granarium according to nutrient.The study includes investigation of the percentages of fatty acid of nutrient and the fatty acid percentages in phospholipid and triacylglycerol fractions of Trogoderma granarium larvae and adult, which feed on grain, rice, pellicle, corn flour and walnut.First samples of insects were collected from grain stores in Diyarbakır in April and May, 2009.The fatty acid composition of nutrients and the fatty acid composition in phospholipid and triacylglycerol fractions of Trogoderma granarium larvae and adults using fatty acid standarts by gas chromatography.It is found that most of the fatty acid composition of the larvae and adults of Trogoderma granarium were oleic acid, palmitic acid, linoleic acid and linolenic acid; the percentages of stearic acid, heksadecadioneic acid, palmitoleic acid, miristic acid and lauric acids were low.According to conditions of gas chromatography the highest percentages in nutrients were found; palmitic acid (16:0), one of the saturated fatty acid, palmitoleic acid (16: 1n-7), oleic acid (18: 1n-9), both of the monounsaturated fatty acid, linoleic acid (18: 2n-6) and linolenic acid (18: 3n-3) in walnut, both of the polyunsaturated fatty acid.For larvae feeding on grain, rice, pellicle, corn flour and walnut the highest percentages in phospholipid were oleic acid, linoleic acid and palmitic acid.For adults feeding on grain, rice and pellicle phospholipid fractions of the highest percentages of oleic acid, linoleic acid and palmitic acid; in triacylglycerol fractions the highest percentages of palmitic acid and oleic acid for adults feeding on rice; linoleic acid and palmitic acid for adult feeding on pellicle; oleic acid, linoleic acid and palmitic acid for adult feeding on grain, corn flour and walnut were found.Differences according to nutrient types were observed the other fatty acid percentages.Key words: Coleoptera, Dermestidae, Trogoderma granarium, Fatty Acid Composition, Phospholipid, Triacylglycerol.