مرکز منطقه ای اطلاع رساني علوم و فناوري - Seasonal Variation in the Fatty Acid Composition of the Neutral Lipid, Phospholipid and Total Lipids of Theodoxus syriacus (Gastropoda: Prosobranchia)

Abstract :

Seasonal variation of the fatty acid composition of the neutral lipid, phospholipid and total body lipid of freshwater snail Theodoxus syriacus (Bourguignat, 1853) collected from Devegeçidi Bridge vicinity in Diyarbakır, were investigated over the course of the year. Snail’s whole body lipids were fractionated by thin layer chromatography. Fatty acid composition of the total lipid, phospholipid and neutral lipid of the snail were analyzed by capillary gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) methods. In the lipid analyses, C16:0, C18:0, C18:1ω9, C18:2ω6 and C18:3ω3 acids percentages were found higher than other fatty acids. Some important differences were found among the percentages of phospholipid, neutral and total lipid. It was observed that seasonal variation of the fatty acids was partly related to temperature and diet. The highest levels of total saturated fatty acids (□SFA) mostly were found in summer season (phospholipid 47.75%, neutral lipid 45.61% and total lipid 41.63%). The highest level of total monounsaturated fatty acids (□MUFA) in the phospholipid fraction was found in winter season 35.05 %); in the neutral (34.83%) and total lipid (39.10%) was found in spring season. In all of the analyses, the highest levels of total polyunsaturated fatty acid (□PUFA) were determined in autumn season (phospholipid 55.89%, neutral lipid 59.99% and total lipid 50.66%). This high percentage is attributed to the high quantity of C18:2ω6 acid (36.42 % - 54.30 %) in autumn season.