Improved Extraction Method to Evaluate the Degradation of Selected PAHs by Marine Fungi Grown in Fermentative Medium
نویسندگان
چکیده
O estudo propõe um método otimizado para avaliar a degradação de hidrocarbonetos policíclicos aromáticos (HPAs) por fungos filamentosos. A adsorção dos HPAs pelo micélio requer o emprego de uma extração exaustiva, normalmente realizada através da combinação de diferentes técnicas aplicadas, separadamente, ao meio líquido e ao micélio. Este trabalho sugere uma simplificação da etapa de extração, reduzindo o tempo de análise e a manipulação da amostra e garantindo a precisão e a exatidão do método. Os HPAs selecionados, pireno e benzo[a]pireno, foram quantificados por cromatografia gasosa usando detector seletivo de massas operando no modo de monitoramento seletivo de íons. O método foi validado apresentando exatidão no âmbito estudado e utilizado para a avaliação do potencial de degradação de HPAs por treze fungos derivados de ambiente marinho. O estudo selecionou o fungo Aspergillus sclerotiorum CBMAI 849 pela capacidade de degradação de 85% de pireno e 61% de benzo[a]pireno após 4 e 8 dias, respectivamente, e o fungo Mucor racemosus CBMAI 847 pela capacidade de degradação de 44% de benzo[a]pireno após 8 dias.
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