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Influence of the toxic compounds present in brewer's spent grain hemicellulosic hydrolysate on xylose-to-xylitol bioconversion by Candida guilliermondii

Paper ID Volume ID Publish Year Pages File Format Full-Text
36591 45137 2005 6 PDF Available
Title
Influence of the toxic compounds present in brewer's spent grain hemicellulosic hydrolysate on xylose-to-xylitol bioconversion by Candida guilliermondii
Abstract

Fermentation media containing different concentrations of toxic compounds were prepared from brewer's spent grain (BSG) hemicellulosic hydrolysate, and used for xylose-to-xylitol bioconversion by Candida guilliermondii. Such fermentation media were composed of the hydrolysate in the following ways: raw (RH); concentrated four-fold (CH); concentrated and treated with activated charcoal (TCH); raw supplemented with sugars until a concentration four-fold higher (SRH); concentrated and subsequently diluted but supplemented with sugars until a concentration four-fold higher (SDCH). All media presented an initial xylose concentration of 85 g/l, except RH, which contained 23 g/l xylose. Fermentation results revealed that the sugars supplementation to raw hydrolysate favored the xylitol production. Nevertheless, xylitol production from CH was negatively affected due to the high concentration of toxic compounds present in the medium. The hydrolysate treatment with activated charcoal partially removed the toxic compounds, and the xylitol production was higher than in CH, but not so efficient as in SRH. It was thus concluded that to obtain an efficient xylose-to-xylitol bioconversion from BSG hydrolysate, the sugars concentration must be increased, but the toxic compounds concentration must be reduced to the same level present in the raw hydrolysate.

Keywords
Brewer's spent grain; Hemicellulosic hydrolysate; Xylose; Toxic compounds; Xylitol; Candida guilliermondii
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Influence of the toxic compounds present in brewer's spent grain hemicellulosic hydrolysate on xylose-to-xylitol bioconversion by Candida guilliermondii
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 12, December 2005, Pages 3801–3806
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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