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Xylitol bioproduction from wheat straw: hemicellulose hydrolysis and hydrolyzate fermentation
Author(s) -
Canilha Larissa,
Carvalho Walter,
Batista João,
Silva Almeida e
Publication year - 2006
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2524
Subject(s) - bioproduction , hemicellulose , xylitol , xylose , bioconversion , chemistry , fermentation , hydrolysis , food science , hydrolysate , yield (engineering) , corncob , straw , biochemistry , nuclear chemistry , organic chemistry , inorganic chemistry , materials science , raw material , metallurgy
A 2 2 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 ( Y S/RM ). Under the best hydrolysis condition (140 °C and 200 mg g −1 ), a Y S/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 ( Q P ) of 0.57 g L −1 h −1 and bioconversion yield ( Y P/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