Xylitol bioproduction from wheat straw: hemicellulose hydrolysis and hydrolyzate fermentation |
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Authors: | Larissa Canilha Walter Carvalho Joo Batista Almeida e Silva |
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Affiliation: | Larissa Canilha,Walter Carvalho,João Batista,Almeida e Silva |
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Abstract: | A 22 central composite design with five center points was performed to estimate the effects of temperature (120, 130 and 140 °C) and acid loading (100, 150 and 200 mg g?1) on the yield of monomeric xylose recovery from wheat straw hemicellulose (YS/RM). Under the best hydrolysis condition (140 °C and 200 mg g?1), a YS/RM of 0.26 g g?1 was achieved. After vacuum concentration and detoxification by pH alteration and active charcoal adsorption, the hydrolyzate was used as source of xylose for xylitol bioproduction in a stirred tank reactor. A xylitol production of 30.8 g L?1 was achieved after 54 h?1 of fermentation, resulting in a productivity (QP) of 0.57 g L?1 h?1 and bioconversion yield (YP/S) of 0.88 g g?1. The maximum specific rates of xylose consumption and xylitol production were 0.19 and 0.15 g g?1 h?1, respectively. Copyright © 2006 Society of Chemical Industry |
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Keywords: | wheat straw dilute acid hydrolysis hydrolyzate xylitol kinetics |
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