Uso de carvão ativado e resina de troca iônica para limpeza e concentração de enzimas em extratos de madeira biodegradada

Abstract

Ceriporiopsis subvermispora was used for the biodegradation of Eucalyptus grandis chips in the presence or absence of cosubstrates (glucose and corn steep liquor) during 7, 14 and 28 days. Afterwards, the biodegraded chips were extracted with 50 mM sodium acetate buffer (pH 5.5) supplemented with 0.01% Tween 60. High activities of manganese peroxidases (MnPs) were observed in all the extracts, both in the absence (430, 765 and 896 UI kg-1, respectively) and in the presence of co-substrates (1,013; 2,066 and 2,323 UI kg-1, respectively). The extracts presented a high ratio between absorbances at 280 and 405 nm, indicating a strong abundance of aromatic compounds derived from lignin over hemeperoxidases. Adsorption into activated charcoal showed to be an adequate strategy to reduce the absorbance at 280 nm in all the extracts. Moreover, it allowed to maximize the capacity of an anion exchange resin bed (DEAE-Sepharose) used to concentrate the MnPs present in the extracts. It was concluded that the use of activated charcoal followed by adsorption into DEAE Sepharose is a strategy that can be used to concentrate MnPs in extracts obtained during the biodegradation of E. grandis by C. subvermispora.