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Optimization of SO 2 ‐catalyzed hydrolysis of corncob for xylose and xylitol production
Author(s) -
Fan Xiaoguang,
Li Menghua,
Zhang Jingkun,
Tang Pingwah,
Yuan Qipeng
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4250
Subject(s) - hydrolysate , xylitol , corncob , hydrolysis , xylose , chemistry , hemicellulose , sulfuric acid , fermentation , catalysis , acid hydrolysis , enzymatic hydrolysis , food science , biochemistry , organic chemistry , raw material
BACKGROUND Conventional techniques for corncob hydrolysis were generally based on acid treatment. However, a large number of by‐products and undesirable compounds released during acid hydrolysis process may act as inhibitors to xylitol fermentation. To replace acid hydrolysis, SO 2 ‐catalyzed hydrolysis was used in this study to improve the fermentability of corncob hemicellulose hydrolysate. RESULTS Based on a central composite design ( CCD ), 20 operations were performed to optimize the process of SO 2 ‐catalyzed hydrolysis by varying SO 2 concentration, temperature and reaction time. The optimum condition found for these parameters was 2.16% (wt), 142 °C, 98 min, with 90.51% of the theoretical xylose yield obtained. In a comparison with sulfuric acid hydrolysis, SO 2 ‐catalyzed hydrolysis was proved to be preferable since it resulted in approximately the same sugar yields, but better fermentability. The conversion of xylose to xylitol and volumetric productivity fermented from concentrated SO 2 ‐catalyzed hydrolysate ( SCH ) were 70.21% and 1.16 g L ‐1 h ‐1 , respectively, higher than those fermented from concentrated sulfuric acid hydrolysate ( SAH ). CONCLUSION Findings suggested that the SO 2 ‐catalyzed hydrolysis strategy can be conveniently and effectively applied to xylose and xylitol production. © 2013 Society of Chemical Industry