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Abstract

The seasonal effects on the fatty acid composition of total lipid, triacylglicerol and phospholipid in the dorsal muscle of Silurus triostegus were determined by gas chromatographic (GC) method. The total polyunsaturated fatty acids (PUFA) and monounsaturated fatty acids (MUFA) were the most important groups of total lipid and statistically ranged (P<0.05) from 33.88% to 55.85% and from 23.37% to 38.71%, respectively. The major fatty acids of total lipid in all seasons were palmitic acid (16:0) in SFA, oleic acid (18:1) in MUFA, linoleic acid (18:2) in n-6 PUFA, and docosahexanoic acid (22:6, DHA) in n-3 PUFA. In the present study, n-3/n-6 ratios of total lipid were 2.47, 1.20, 1.03 and 1.40 in spring, summer, autumn and winter, respectively. It was determined that MUFA and PUFA were the most important groups of triacylglicerol and statistically ranged (P<0.05) from 34.09% to 47.02% and from 33.13% to 46.12%, respectively. The main fatty acids of triacylglicerol were palmitic acid in SFA, oleic acid in MUFA and linoleic acid in PUFA. PUFA was the most important group of phospholipid except summer. The total PUFA percentages of the phospholipid statistically ranged (P<0.05) from 38.12% to 65.75%. The major fatty acids identified in the phospholipid were palmitic acid in SFA, oleic acid in MUFA, arachidonic acid (20:4, AA) in n-6 PUFA and DHA in n-3 PUFA in all seasons. DHA was very high in winter (30.41%). It was shown that the fatty acid compositions in the muscle of fish were significantly influenced by seasons.Keywords: Seasonal variation, fatty acid composition, fish, Silurus triostegus, n-3/n-6 ratio. Dicle Nehri'ndeki (Türkiye) Mezopotamya Yayın Balığı'nın (Silurus triostegus Heckel, 1843) Dorsal Kasındaki Total Lipit, Fosfolipit ve Triaçilgliserolün Yağ Asit Kompozisyonu Üzerinde Mevsimsel Değişimin Etkileri ÖzetSilurus triostegus'un dorsal kasındaki total lipit, triaçilgliserol ve fosfolipitin yağ asit kompozisyonu üzerindeki mevsimsel etkiler, gaz kromatografisi ile (GC) belirlendi. Total çoklu doymamış yağ asitleri (PUFA) ve tekli doymamış yağ asitleri (MUFA), total lipitin en önemli gruplarıydı ve istatistiksel olarak (p<0.05) sırasıyla %33.88'den %55.85'e ve %23.37'den %38.71'e değişti. Bütün mevsimlerde total lipitin en önemli yağ asitleri; doymuş yağ asitlerinde (SFA) palmitik asit (16:0), MUFA'da oleik asit (18:1), n-6 PUFA'da linoleik asit (18:2) ve n-3 PUFA'da dokosahekzaenoik asit (22:6, DHA) idi. Bu çalışmada, total lipitin n-3/n-6 oranları bahar, yaz, sonbahar ve kış mevsimlerinde sırasıyla 2.47, 1.20, 1.03 ve 1.40 idi. MUFA ve PUFA'nın, triaçilgliserolün en önemli grupları olduğu ve istatistiksel olarak (p<0.05) sırasıyla %34.09'dan %47.02'ye ve %33.13'den %46.12'ye değiştiği belirlendi. Triaçilgliserolün temel yağ asitleri; SFA'da palmitik asit, MUFA'da oleik asit ve PUFA'da linoleik asitti. PUFA, yaz mevsimi dışında fosfolipitin en önemli grubuydu. Fosfolipitin total PUFA yüzdeleri, istatistiksel olarak (p<0.05) %38.12'den %65.75'e değişti. Tüm mevsimlerde, fosfolipitte tayin edilen...

Effect of season on the fatty acid profile of total lipids, phospholipids and triacylglycerols in <em>Mastacembelus mastacembelus</em> (Atatürk Dam Lake, Turkey)

“…Our findings are also in close agreement with those reported by Haliloğlu et al, (2004), Akpınar et al, (2009 and Cengiz et al, (2012) for other freshwater fish.…”

“…C18:1 ω-9 was the most ample of the monoenes in all seasons. Our findings concerning the C18:1 ω-9 FA are almost comparable to the concentration reported by Haliloğlu et al, (2004) and Cengiz et al, (2012) for the same FA in the muscle of freshwater fish. A low level of C16:1 ω-7 lowered the MUFA contents of M. mastacembelus.…”

Antioxidant Effect of Nanoemulsions Based on Citrus Peel Essential Oils: Prevention of Lipid Oxidation in Trout

“…The ɷ6/ɷ3 ratio of unsaturated fatty acids is associated with mortality causes from cancer and cardiovascular diseases. [ 65 ] It has been reported that this ratio is also important indicator used to compare nutritional values in fish oil [ 66,67 ] and should be kept as low as 1:1 or 2:1 in diets. [ 68,69 ] According to HMSO, [ 62 ] it was proposed that this ratio can have a maximum value of 4.…”

“…Cengiz et al. [ 67 ] suggested that a ratio between 0.2 and 1.6 constitutes a healthy human diet. The reduction of Σɷ6/ɷ3 ratio in the human diet is essential to help prevent coronary heart disease and reduce cancer risk.…”

Time-Restricted Feeding Could Not Reduce Rainbow Trout Lipid Deposition Induced by Artificial Night Light

“…In the present study, LL exposure may have caused stress in rainbow trout [ 97 ], leading to a decrease in the proportion of HUFA in muscle. On the other hand, it was found that rainbow trout [ 100 ] and Mesopotamian catfish ( Silurus triostegus ) [ 101 ] had a higher MUFA and lower PUFA in summer (long daylight) than in winter (short daylight). Xie et al (2013) [ 99 ] suggested that seasons affect fatty acids mainly related to changes in the photoperiod and temperature.…”