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The activity of family 11 xylanases at alkaline pH

Paper ID Volume ID Publish Year Pages File Format Full-Text
33557 44984 2010 8 PDF Available
Title
The activity of family 11 xylanases at alkaline pH
Abstract

Xylanases have several industrial uses, particularly in baking, modification of animal feed and in pulp bleaching in the paper industry. Process conditions in kraft pulp bleaching generally favour an enzyme that is active at high pH values. The activities of several glycosyl hydrolase family 11 xylanases reported to be active under alkaline conditions were determined under optimal conditions and found to have optima in the pH 5–6 range. Only one enzyme tested, BadX, was shown to have an alkaline pH optimum. Significant activity at pH values higher than 8 appears often to be the result of excess enzyme added to the reaction mixtures so that substrate is limiting. The different nature of laboratory and industrial substrates needs to be taken into consideration in designing assay conditions. In some cases, significant differences were observed in pH profiles generated using a small-molecule substrate when compared to those generated using xylan. We conclude that small-molecule substrates are not a suitable proxy for determining the pH profiles of family 11 xylanases.

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The activity of family 11 xylanases at alkaline pH
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Publisher
Database: Elsevier - ScienceDirect
Journal: New Biotechnology - Volume 27, Issue 6, 31 December 2010, Pages 795–802
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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