Journal
CHEMICAL PAPERS
Volume 69, Issue 8, Pages 1050-1057Publisher
SPRINGER INT PUBL AG
DOI: 10.1515/chempap-2015-0111
Keywords
Aspergillus niger; Atlantic rainforest biome; cellulase; rice meal; fermentation inhibitors
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Funding
- National Council for Scientific and Technological Development (CNPq/Brazil) [Proc. 563260/2010-6]
- National System for Research on Biodiversity (Sisbiota-Brazil)
- CAPES
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Properties of beta-glucosidase produced by Aspergillus niger URM 6642 recently isolated from the Atlantic rainforest biome and its potential tolerance to saccharification of lignocellulosic biomass products and fermentation inhibitors was evaluated. The fungus was cultivated under solid state culture conditions at 37 degrees C with different agro-industrial wastes. High levels of beta-glucosidase (3778.9 U g(-1)) from A. niger were obtained with rice meal as substrate under solid state culture conditions after ten days. Optimum pH for this particular beta-glucosidase activity was 4.0 although it was stable in the range of 4.0 to 7.0. The half-life (T-1/2) of beta-glucosidase at 55 degrees C is 3 h. However, at the optimum temperature of the enzyme, 65 degrees C, T-1/2 is 20 min. The enzyme showed tolerance to various compounds such as glucose, xylose, 5-hydroxymethyl furfural, furfural, coumarin, ethanol and acetic acid. Therefore, beta-glucosidase from the novel A. niger species may be of potential use in the saccharification of lignocellulosic biomass, as well as an additional enzyme supplement in cellulase cocktails used to increase the yield of fermentable sugars. (C) 2015 Institute of Chemistry, Slovak Academy of Sciences
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