Quality evaluation of lipid from Itoyori surimi wash water: A comparative study on different extraction process

Abstract

The disposal of fish processing waste is the major issue due to the negative environmental impact. Hence the utilization of fish processing waste in an efficient way is gaining importance. Surimi industries discharge huge quantity of wash water to the environment as waste, which contain several bioactive compounds such as lipid, protein and peptides. The present study was intended to analysis the extractability and quality of lipid from surimi wash water using different extraction process viz. heat extraction and Bligh and Dyer method. The quality of lipid extracted by the above methods was evaluated by free fatty acid, peroxide value, anisidine value and totox value analysis. The higher yield was reported in heat extraction method. Heat extraction showed adverse quality changes compared to Bligh and Dyer method and it might be due to the high processing temperature which causes lipid oxidation. In fatty acid analysis, heat extracted lipid showed the high content of saturated fatty acid compared to unsaturated Fatty acid. Palmitic Acid was the major saturated fatty acid which occupies 56.9 per cent of total saturated fatty acid. The most abundant unsaturated fatty acid was Docosahexaenoic acid (DHA), about 25.9 per cent of total unsaturated fatty acids. EPA reported 12.2 per cent of total unsaturated fatty acid.