Uso de aditivos na biodegradação de madeira pelo fungo Ceriporiopsis subvermispora: efeito na peroxidação de lipídios dependente de manganês-peroxidase

Abstract

Recebido em 12/7/11; aceito em 6/12/11; publicado na web em 31/1/12 USE OF ADDITIVES IN THE WOOD BIODEGRADATION BY THE FUNGUS Ceriporiopsis subvermispora: EFFECT IN THE MANGANESE PEROXIDASE-DEPENDENT LIPID PEROXIDATION. Ceriporiopsis subvermispora is a selective fungus in the wood delignification and the most promising in biopulping. Through the lipid peroxidation initiated by manganese peroxidase (MnP), free radicals can be generated, which can act in the degradation of lignin nonphenolic structures. This work evaluated the prooxidant activity (based in lipid peroxidation) of enzymatic extracts from wood biodegradation by this fungus in cultures containing exogenous calcium, oxalic acid or soybean oil. It was observed that MnP significant activity is required to promote lipid peroxidation and wood delignification. Positive correlation between prooxidant activity x MnP was observed up to 300 IU kg -1 of wood.

The fungal ability for biobleaching/biopulping/bioremediation of lignin-like compounds of agro-industrial raw material

“…64 Other authors evaluated the pro-oxidant activity of enzymatic extracts from cultures of Ceriporiopsis subvermispora on wood plus calcium and oxalic acid or soybean oil, observing that significant activity of MnP was required to promote lipid peroxidation and wood delignification. 83 Several factors contribute to the different white-rot fungi show distinct mechanisms to degrade lignin in a broad range of plants. 40,41,84 Some, such as Phellinus nigrolimitatus, predominantly do this without a substantial loss of cellulose, and cause white-pocket or white-mottled type of rot.…”