Enzymatic Hydrolysis of Steam Treated Aspen Wood: Influence of Partial Hemicellulose and Lignin Removal Prior to Pretreatment
作者:
W. Schwald,
H.H. Brownell,
J.N. Saddler,
期刊:
Journal of Wood Chemistry and Technology
(Taylor Available online 1988)
卷期:
Volume 8,
issue 4
页码: 543-560
ISSN:0277-3813
年代: 1988
DOI:10.1080/02773818808070700
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Aspen wood chips were treated with acidified chlorite to remove 90% of the lignin, or were extracted with concentrated alkali to remove 500 of the hemicellulose. Samples of the original chips, the resulting low-lignin aspenwood (LLA) and the low-hemicellulose aspenwood (LLA) were treated with saturated steam at 240°C for 20–180 s. Chemical analysis and enzymatic hydrolysis of the resulting water-washed substrates showed that, after 40 s of steaming, the rate and extent of enzymatic hydrolysis correlated better with removal of alkali-insoluble lignin than with removal of xylan. The original wood, LLA and LHA had similar crystallinity indices which increased in the water-insoluble fractions with time of steaming. Carbohydrate degradation products (“pseudo-lignin”) formed in equal amounts on steaming original wood or LLA, indicating furfural-lignin condensation to be not involved. Development of accessibility in LHA resembled that in original aspenwood, despite the absence of acetic acid for autohydrolysis.
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