Abstract :

Este trabalho teve como objetivo otimizar a extração de compostos bioativos de cascas de jambolão utilizando extração assistida por ultrassom e desenvolver filme ativo a partir de isolado proteico de soja e extrato de casca de jambolão. Para tanto, avaliou-se o efeito do tempo de processo e da concentração do solvente sobre compostos fenólicos totais, atividade antioxidante e bacteriana do extrato. A partir das condições ideais desses parâmetros, filmes foram preparados e o efeito da adição do extrato nas propriedades mecânicas, atividade bacteriana e capacidade antioxidante dos filmes ativos foram avaliados. Os resultados mostraram que a alta concentração de etanol reduziu a extração dos compostos bioativos com atividade antioxidante da casca de jambolão, entretanto, a interação entre o tempo de extração e a concentração de etanol apresentou efeito positivo na extração desses compostos. O extrato com ação bactericida contra Staphylococcus aureus e Escherichia coli não foi obtido em condições otimizadas. A adição do extrato reduziu a resistência à tração do filme de SPI, mas aumentou sua elasticidade e capacidade antioxidante. Os filmes de extrato SPI + afetaram a integridade da membrana celular bacteriana de Staphylococcus aureus e Escherichia coli. Filmes de SPI com extrato de casca de jambolão podem ser uma alternativa para limitar processos oxidativos indesejáveis e inibir o desenvolvimento bacteriano em alimentos embalados.

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Keywords :

antioxidant; bioactive-compounds; jambolan; SPI-film; ultrasound-assisted.

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