Avaliação da qualidade do óleo extraído do peixe bagre, fresco e congelado, comercializado no mercado Manhaua, cidade de Quelimane

Abstract

Research has been intensified focusing the analysis of the nutritional composition of marine products as they are rich in n-3 polyunsaturated fatty acids beneficial to human health. In Mozambique, despite the vast coastline, the production of fish oil is generally intended for animal feed, the manufacture of paints and varnishes or its use as a lubricant and waterproofing agent. Thus, there is no effective quality control in the production of domestic fish oil which leads to a reduced quality raw material. In view of this context, this work aimed to evaluate the quality of the oil extracted from fresh and frozen Arius dussumier catfish, marketed in the Manhaua market, in the city of Quelimane. Catfish oil was obtained by the cold pressing method and then subjected to physical-chemical analysis (acidity index, peroxide index, moisture index and density). The results obtained in the present study showed that catfish oil is high quality, since the values obtained are within the parameters established by INNOQ. The mean values of the physical and chemical analyzes of frozen fish oil and fresh fish did not have statistically significant differences. For fresh fish we had average values of (acid index 0.307 mg KOH / g, peroxide index 0.649 mEq / kg , moisture content 0.488 mg / kg and density 0.610 mg / m3, and for frozen fish we had mean values of (acid number 0.302 mg KOH / g, peroxide index 0.646 mEq / kg, moisture content 0.506 mg / kg and density 0.616 mg / m3. It was observed that fresh fish oil obtained higher values in relation to frozen fish oil, only the moisture content that there was higher values in frozen fish compared to fresh fish.