Depolymerization of low rank coal by extracellular fungal enzyme systems .1. Screening for low rank-coal-depolymerizing activities

被引:70
作者
Hofrichter, M
Fritsche, W
机构
[1] Friedrich-Schiller-University, Jena Institute for Microbiology, Department Technical Microbiology, D-07743 Jena
关键词
D O I
10.1007/s002530050808
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
A miniscale screening system was developed to detect depolymerizing activities of fungi toward low-rank; coals, This system was suitable for the determination of changes in molecular masses as well as for the measurement of the enzymes responsible. A total of 486 fungal strains of different ecophysiological and taxonomic groups were tested for their ability to decolorize agar media containing coal-derived humic acids: 38 wood- and litter-decaying basidiomycetes caused a strong bleaching effect and 49 a weak effect, In contrast, micromycetes were proved to be unable to decolorize the coal substances. The wood-decaying fungus Nematoloma frowardii b19 most effectively bleached the medium, It could be demonstrated by; gel-permeation chromatography that the strain really depolymerizes the high molecular-mass fractions of coal humic acids by forming fulvic-acid-like compounds Extracellular enzyme activities of oxidases and peroxidases towards 2,2'-azinobis(3-ethylbenzthiazolinesulphonate) were extractable from the agar media.
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页码:220 / 225
页数:6
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