ÍNDICE DE FRESCOR OCULAR: UM MODELO MATEMÁTICO BASEADO EM IMAGENS PARA AVALIAÇÃO NÃO DESTRUTIVA DA QUALIDADE DE Pangasius sp.
DOI:
https://doi.org/10.18817/repesca.v17i1.4386Palavras-chave:
IFO, Peixe panga, Análise de imagens, Qualidade do peixe, Método não destrutivoResumo
A avaliação do frescor do pescado é um aspecto fundamental para garantir a qualidade do produto e a segurança alimentar, porém os métodos tradicionalmente empregados apresentam limitações relacionadas à subjetividade, ao custo e à necessidade de infraestrutura laboratorial. Nesse contexto, o presente estudo teve como objetivo desenvolver e validar um modelo matemático não destrutivo, denominado Índice de Frescor Ocular (IFO), baseado na análise de imagens do olho de Pangasius sp., visando à avaliação objetiva do frescor e da qualidade do pescado ao longo do armazenamento em gelo. Foram analisados exemplares em três tempos distintos: imediatamente após a captura (frescor ideal), após 8 dias (frescor moderado) e após 22 dias de estocagem em gelo (frescor ruim). As imagens do olho foram obtidas sob condições padronizadas e submetidas a técnicas de processamento digital para extração de variáveis ópticas relacionadas ao brilho, transparência, homogeneidade da textura e reflexividade especular. Essas variáveis foram integradas em um modelo matemático contínuo, resultando no IFO. Os resultados demonstraram alterações mensuráveis nos parâmetros oculares em função do tempo de estocagem, evidenciando a sensibilidade do índice às mudanças associadas à deterioração pós-morte. O método proposto mostrou-se viável, de baixo custo e aplicável em condições reais de comercialização, configurando-se como uma ferramenta promissora para complementar os métodos tradicionais de avaliação do frescor do pescado.
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