Amino Acids Profile of Some Economically Important Marine and Freshwater Fish from Sudan

Abstract: Amino acids profile of Sudanese marine and freshwater commercial fish species was estimated. The freshwater fish species studied here were: Oreochromis niloticus, Bagrus bayad and Lates niloticus and the marine fish species were: Plectropomus maculates, Lethrinus harak and Mugil cephalus. Flesh of each sample was isolated and freeze dried, hydrolyzed by 6N HCl and amino acids profile determined using the amino acid analyzer model (SYKAM 57130). A total of 14 amino acids were reported in each of the marine and freshwater fish samples. The sum of essential amino acids percentage was 43.04% in marine species and 40.41% in freshwater species. Seven essential amino acids were detected. No significant variation was observed between marine and freshwater fish species except for histidine and isolucine which were found significantly higher in marine fishes. Among the nonessential amino acids, only alanine was found significantly higher in marine fish and specifically in P. maculates. Aspartic acid and glutamic acid were highest in the fresh water fish L. niloticus. Serine was highest in M. cephalus. Conditional essential amino acids revealed significantly high percentages of arginine in the marine fish species, especially R. canadum as well as tyrosine. Marine species L. harak showed also the highest percentage of essential amino acids except for histidine and lysine. Glysine was found highest though in the freshwater species O. niloticus. To conclude, both marine and freshwater species possess high quality protein. Nonetheless, L. harak and L. niloticus species are highly recommended as a dietary supplement since they contain essential amino acids in quantities sufficient for human health.

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[H. A. Saad and D. I. Alim (2015); Amino Acids Profile of Some Economically Important Marine and Freshwater Fish from Sudan Int. J. of Adv. Res. 3 (2). 0] (ISSN 2320-5407).

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