Bioprocess and biotechnology: effect of xylanase from Aspergillus niger and Aspergillus flavus on pulp biobleaching and enzyme production using agroindustrial residues as substract

This study compares two xylanases produced by filamentous fungi such as A. niger and A. flavus using agroindustrial residues as substract and evaluated the effect of these enzymes on cellulose pulp biobleaching process. Wheat bran was the best carbon source for xylanase production by A. niger and A....

Full description

Saved in:
Bibliographic Details
Published in:SpringerPlus 2013-08, Vol.2 (1), p.1, Article 380
Main Authors: de Alencar Guimaraes, Nelciele Cavalieri, Sorgatto, Michele, Peixoto-Nogueira, Simone de Carvalho, Betini, Jorge Henrique Almeida, Zanoelo, Fabiana Fonseca, Marques, Maria Rita, de Moraes Polizeli, Maria de Lourdes Teixeira, Giannesi, Giovana C
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study compares two xylanases produced by filamentous fungi such as A. niger and A. flavus using agroindustrial residues as substract and evaluated the effect of these enzymes on cellulose pulp biobleaching process. Wheat bran was the best carbon source for xylanase production by A. niger and A. flavus . The production of xylanase was 18 and 21% higher on wheat bran when we compare the xylanase production with xylan. At 50°C, the xylanase of A. niger retained over 85% activity with 2 h of incubation, and A. flavus had a half-life of more than 75 minutes. At 55°C, the xylanase produced by A. niger showed more stable than from A. flavus showing a half-life of more than 45 minutes. The xylanase activity of A. niger and A. flavus were somehow protected in the presence of glycerol 5% when compared to the control (without additives). On the biobleaching assay it was observed that the xylanase from A. flavus was more effective in comparison to A. niger . The kappa efficiency corresponded to 36.32 and 25.93, respectively. That is important to emphasize that the cellulase activity was either analyzed and significant levels were not detected, which explain why the viscosity was not significantly modified.
ISSN:2193-1801
2193-1801
DOI:10.1186/2193-1801-2-380