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Appl Biochem Biotechnol. 2018 Jan;184(1):264-277. doi: 10.1007/s12010-017-2545-x. Epub 2017 Jul 4.

Lignin Sulfonation and SO2 Addition Enhance the Hydrolyzability of Deacetylated and Then Steam-Pretreated Poplar with Reduced Inhibitor Formation.

Author information

1
Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, China. jaketang2006@hotmail.com.
2
Forest Products Biotechnology, Department of Wood Science, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada. jaketang2006@hotmail.com.
3
Forest Products Biotechnology, Department of Wood Science, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada.
4
Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, China. jiangjx@bjfu.edu.cn.

Abstract

The merit of deacetylation of corn stover prior to pretreatment is decreasing the formation of inhibitors and improving enzyme hydrolysis, proved in dilute acid pretreatment. However, few studies are done on how deacetylation would affect bioconversion process containing steam explosion. In this study, the effect of deacetylation on steam explosion was conducted using poplar as substrate. About 57 to 90% of acetyl group in poplar, depending on alkaline types and concentration, was removed by dilute alkaline deacetylation in 6 h. Deacetylation eliminated over 85% of inhibitor formation during downstream steam explosion. However, deacetylation prior to steam explosion decreased the dissolution of hemicellulose, thus reducing the cellulose accessibility of pretreated poplar, finally resulting in 5-20% decrease in glucose yield and 20-35% decrease in xylose yield. The addition of 5% SO2 during steam explosion significantly improved the hydrolysis of deacetylated and pretreated poplar without significantly increasing the concentration of inhibitors. Incorporating 45 mmol/kg sulfoacid group in lignin fraction of deacetylated and then pretreated poplar dramatically improved the xylose yield to about 100% and increased the glucose yield by 30%.

KEYWORDS:

Acetyl group; Deacetylation; Poplar; Steam explosion

PMID:
28676960
DOI:
10.1007/s12010-017-2545-x
[Indexed for MEDLINE]

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