Biochemical characterization in different tissue of smallnose fanskake, S. Bonaparte

MASSA, AGUEDA E.; FERNANDEZ COMPAS, ANDREA; YEANNES, MARIA I.

Rosario

Congreso; Congreso y XXX Reunión Anual de la Sociedad de Biología de Rosario.; 2010

Sociedad de Biología de Rosario.

The smallnose fanskate, Sympterygia bonapartii, is a endemic skates of south-west Atlantic; and it is one of the major skates species that has been caught along the Buenos Aires coast. The frozen fins are marketed for export mainly to Asian countries; generating large amount of waste (65-70% by weight). The aim of this study was to characterize biochemically the waste generated in the marketing of S. bonapartii to explore the viability to obtain high value added products. The specimens were dissected, gonads and livers were extracted and the fins were separated, leaving a rest (head, trunk, tail). Moisture, protein and ash were determinate according AOAC (1996); lipids were extracted by Bligh & Dyer and fatty acids were analyzed using gas chromatography. The cartilaginous tissue was quantified after enzymatic hydrolysis using alkaline protease. The tissues analyzed showed a protein content between 14.66 to 22.86%. The percentage lipid in fins and the rest was 1%, in gonads 3.51±1.20% and in liver 32.27 ±5.54%. The liver oil presented a 35-40% of polyunsaturated fatty acids (PUFAs). Among them, those found in the highest proportions were docosahexaenoic acid (DHA n-3, 20-25%) and eicosapentaenoic acid (EPA n-3, 7-10%). The cartilaginous tissue was 1.66 ±0.18% (fins) and 1.79±0.30% (rest). The chemical composition of this material is very interesting nutritional and economically because they contain high percentage of proteins, lipids rich in n-3 PUFAs and cartilage tissue. Have been reported beneficial properties of n-3 PUFAs of marine origin and cartilage glycosaminoglycans in the prophylaxis and treatment of various diseases.