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Xylitol production from non-detoxified corncob hemicellulose acid hydrolysate by Candida tropicalis

Paper ID Volume ID Publish Year Pages File Format Full-Text
3311 163 2013 6 PDF Available
Title
Xylitol production from non-detoxified corncob hemicellulose acid hydrolysate by Candida tropicalis
Abstract

•Corncob hemicellulose hydrolysate without detoxification was used for xylitol production.•Xylitol yield was influenced by the initial xylose and inhibitors concentrations in the medium.•Biomass growth rate is essential for xylitol production.•A maximal 38.8 g l−1 xylitol was obtained using substrate feeding strategy.

The interest on use of lignocellulose for producing chemicals is increasing as these feedstocks are low cost, renewable and widespread sources of sugars. Corncob is an attractive raw material for xylitol production due to its high content of xylan. In this study, hemicellulose hydrolysate from corncobs without detoxification was used for xylitol production by Candida tropicalis CCTCC M2012462. Compared with prepared xylose medium, xylitol production with dilute acid hydrolysate medium does not seem to influence specific xylose reductase activity. The decrease in xylitol productivity with dilute acid hydrolysate medium is a result of a lower biomass concentration and lag-phase time. It appears that biomass growth rate is essential for xylitol production. In xylitol fermentation with a low initial inhibitors concentration and substrate feeding strategy, a maximal xylitol concentration of 38.8 g l−1 was obtained after 84 h of fermentation, giving a yield of 0.7 g g−1 xylose and a productivity of 0.46 g l−1 h−1.

Keywords
Bioconversion; Corncob; Fermentation; Microbial growth; Substrate inhibition; Xylitol
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Xylitol production from non-detoxified corncob hemicellulose acid hydrolysate by Candida tropicalis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 75, 15 June 2013, Pages 86–91
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us