Avaliação química do óleo extraído dos rejeitos de filetagens da tilápia (oreochromis niloticus) e do óleo de peixe comercial

Abstract

The production of tilapia grows every year in the country, and is currently the main fish in aquaculture in the country, occupying the first place the tilapia of the Nile (Oreochromis niloticus), reaching production of 239.09 thousand tons, being the South region the polo production, followed by the Northeast region. The objective of this study was to evaluate the chemical characteristics of the oils extracted from the tailings of the tilapia and commercial fish oils for storage and industrial control. For the chemical evaluation of the oil of Nile Tilapia (Oreochromis niloticus) and commercial oil the following oleochemical indexes were analyzed: Acidity Index, Free Fatty Acids (FFA), Peroxide Index (PI), Iodine Index (I.I). In all the oleochemical indices for the oil extracted from the tilapia rejects all samples had variable values in comparison to the legislation CODEX ALIMENTARIUS, except for the iodine index, which proved to be quite unsaturated for both batches. In batches 1 and 2 the peroxide was in compliance with the legislation. For the commercial samples all showed an index corresponding to that allowed by the legislation. The results were satisfactory in the evaluation of the crude oil, stability and physico-chemical characteristics, being necessary only a process that aims to improve the quality of the viscera until the moment of extraction of the oils to obtain a product with good quality, and also giving an environmentally sound final destination to tilapia tailings.