Fatty Acid Composition, Physical Properties, Acute Oral Toxicity and Antioxidant Activity of Crude Lipids from Adipose Tissue of Some Commercialized Freshwater Catfish

Crude lipids extracted from the adipose tissues of some commercialized freshwater catfish, including the Mekong giant catfish ( Pangasianodon gigas), striped catfish ( Pangasianodon hypophthalmus) and hybrid catfish ( Pangasius larnaudii x Pangasianodon hypophthalmus) were carried out. Their saturated fatty acid and unsaturated fatty acid contents were not much different, but their polyunsaturated fatty acid contents were obviously different. Their n-3 fatty acid contents were 15.58, 0.83 and 4.36 g per 100 g, respectively, and their eicosapentaenoic acid (EPA):docosahexaenoic acid (DHA) contents were 3.23:4.24, 0.07:0.13 and 0.65:2.72 g per 100 g, respectively. Their n-6 fatty acid contents were 6.36, 9.19 and 8.77 g per 100 g, respectively. They were in solid and semi-solid form at room temperature with certain different physical properties. No sign of toxicity was observed for 14 days in female Wistar albino rats after receiving a dose of crude lipids at 5000 mg/kg. Their antioxidant activities by ABTS assay were 3.21, 4.53 and 6.00 mM Trolox per 1 g, respectively.