improvement of biotechnological xylitol production by glucose during cultive of candida guilliermondii in sugarcane bagasse hydrolysate

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ID: 241809
2007
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Abstract
The effect of glucose on xylose-to-xylitol bioconversion by Candida guilliermondii was examined by adding it to sugarcane bagasse hydrolysate medium to obtain different glucose:xylose ratios (1:25, 1:12, 1:5 and 1:2.5). Under experimental conditions, increasing glucose:xylose ratio improved the assimilation of the xylose present in the hydrolysate by yeast, resulting in biomass increase, and in the formation of xylitol and glycerol/ethanol by-products. Maximum values of xylitol yield (0.59 g g-1) and volumetric productivity (0.53 g l-1.h-1) were obtained with glucose:xylose ratio of 1:5, resulting in the higher conversion efficiency (64.3%).
O efeito da glicose na bioconversão de xilose em xilitol por Candida guilliermondii foi avaliado em hidrolisado hemicelulósico de bagaço de cana com diferentes relações glicose:xilose (1:25, 1:12, 1:5 and 1:2,5). Sob as condições experimentais, o aumento da relação glicose:xilose favoreceu a assimilação da xilose presente no hidrolisado, resultando em aumento da biomassa celular e aumento da formação de xilitol e dos sub-produtos glicerol e etanol. Os valores máximos do fator de conversão de xilose em xilitol (0,59 g g-1) e da produtividade volumétrica de xilitol (0,53 g l-1.h-1) foram obtidos com a relação glicose:xilose 1:5, resultando na maior eficiência de conversão (64,3%).
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Authors ;Débora Danielle Virgínio da Silva;Ismael Maciel de Mancilha;Silvio Silvério da Silva;Maria das Graças de Almeida Felipe
Journal current drug delivery
Year 2007
DOI
10.1590/S1516-89132007000200005
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200005
Keywords
glucose xylitol xylosebiotechnology

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