Qualidade do camarão da espécie Xyphopenaeus kroyeri mediante a ação dos agentes antimelanóticos / Quality of shrimp Xyphopenaeus kroyeri submitted to antimelanotic agents

AUTOR(ES)

Viviane Angeli Yokoyama

DATA DE PUBLICAÇÃO

2008

RESUMO

Sea shrimp captured in the Brazilian coast represents an important segment of the seafood particularly due to the market value. Being a highly perishable food, it requests special cares for commercialization, conservation and industrialization. The control of the quality begins as soon as post-capture in the vessel. The immediate operations accomplished after the capture in the port of Ubatuba/SP are lead in inadequate conditions and, like this, they collaborate for the degradation of the shrimp to be used as raw material, through the autolysis, bacterial decomposition and melanosis or black spot formation. Xyphopenaeus kroyeri were studied of the previous processing, among them, the reception in the warehouse, the wash with hypochlorite and the treatment with conservants. Shrimps were submitted to four conservants concentrations, being 1.25 and 2.5% of sodium metabisulphite and 0.01 and 0.1% of 4-hexylresorcinol being looked for the best concentration starting from observations of physical-chemical, microbiologicals, colour parameters and melanosis score. In the same moment shrimps were obtained from commercial fishing at the Seafood Market in Ubatuba/SP, which were previously treated with sodium metabisulphite. It was also evaluated the residual levels of SO2 in the shrimps submitted to metabisulphite. Samples not submitted to melanosis inhibitor were analyzed to centesimal, mineral and fatty acid composition. The metabisulphite treatments had not presented good conservation in relation to the others being similar to control treatment. The tratment of Seafood Market quickly degradated; this treatment presented a large variation in the components, indicating the lack of standardization. The treatment with 4-hexylresorcinol (0.1%) conserved properly the product for at least 10 days of the melanosis score, and in relation to the other analyses it always maintained the smaller values. The metabisulphite treatments exceeded the maximum limits allowed by the legislation for cold shrimp (100g of SO2 shrimp residual.kg-1) being inappropriate for consumers. The time of storage influenced significantly (P<0.05) in the sulphite levels, however they were not enough for a reduction at levels of Brazilian legislation. The 4-hexylresorcinol is an alternative to the traditional sulphite. Shrimps were considered an expressive source of the proteins and minerals, particulary, calcium, phosphorus, zinc, copper and magnesium; while quantities of lipids and calories were low. Shrimp had a low proportion of saturated (30.54 to 33.97%) and a higher proportion of polyunsaturated fatty acids (21.84 to 36.89%). Long chain omega-3 (n-3) polyunsaturated fatty acids (PUFA) eicosapentaenoic (EPA) (6.98 to 10.7%) and docosahexaenoic (DHA) (6.67 to 14.72%) were observed.

ASSUNTO(S)

consumo de alimentos fatty acids aditivos alimentares black spot microbiologia de alimentos xyphopenaeus kroyeri Ácidos graxos 4-hexylresorcinol qualidade dos alimentos. camarão minerals. shrimp sodium metabisulphite melanose animal

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