Document Detail


Enhanced ethanol production from deacetylated yellow poplar acid hydrolysate by Pichia stipitis.
MedLine Citation:
PMID:  19959357     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this study, alkaline-pretreatment for the extraction of acetic acid from xylan of hemicellulose was introduced prior to concentrated acid hydrolysis of yellow poplar wood meal. Ethanol fermentability in deacetylated yellow poplar hydrolysate (DYPH) by Pichia stipitis was also investigated. The alkali-pretreatment conditions were evaluated in terms of temperature, reaction time, and alkalinity. 94% of the acetyl group in xylan of the yellow poplar hemicellulose fraction was extracted using 0.5% sodium hydroxide solution at 60 degrees C for 60 min. The cell growth and ethanol production of P. stipitis was strongly affected by acetic acid, either in synthetic medium with 7.1g/l of acetic acid added or in yellow poplar hydrolysate (YPH) containing 7.1g/l of acetic acid. On the other hand, ethanol production in DYPH was slightly higher than that of the control although cell growth decreased by 34%. In the case of DYPH, the ethanol yield, volumetric ethanol productivity, and theoretical yield percentage was 0.48 g/g, 0.40 g/lh, and 93.2%, respectively. Thus, the alkaline-pretreatment method greatly enhanced the ethanol fermentability of yellow poplar hydrolysate.
Authors:
Dae Haeng Cho; Soo-Jeong Shin; Yangwon Bae; Chulhwan Park; Yong Hwan Kim
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Publication Detail:
Type:  Journal Article     Date:  2009-12-02
Journal Detail:
Title:  Bioresource technology     Volume:  101     ISSN:  1873-2976     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-03-31     Completed Date:  2010-10-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  4947-51     Citation Subset:  IM    
Copyright Information:
Copyright 2009 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea.
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MeSH Terms
Descriptor/Qualifier:
Acetic Acid / chemistry
Biotechnology / methods*
Carbohydrates / chemistry
Ethanol / chemistry*
Fermentation
Hydrolysis
Kinetics
Liriodendron
Pichia / metabolism*
Polysaccharides / chemistry*
Time Factors
Wood
Chemical
Reg. No./Substance:
0/Carbohydrates; 0/Polysaccharides; 64-17-5/Ethanol; 64-19-7/Acetic Acid; 8024-50-8/hemicellulose

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