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Erschienen in: Wood Science and Technology 5/2015

01.09.2015 | Original

Evaluating effects of benzene–ethanol extraction on molecular weight of lignin isolated from pretreated bamboo substrate

verfasst von: Xiaojuan Ma, Xin Zheng, Ling Lin, Lihui Chen, Shrikant Survase, Liulian Huang, Shilin Cao

Erschienen in: Wood Science and Technology | Ausgabe 5/2015

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Abstract

In a previous study by the authors, it was found that benzene–ethanol extraction (BAE) could remove some of the lignin fragments from pretreated bamboo substrate and therefore cause a decrease in the lignin content of the substrate. In the present study, lignin was isolated by dioxane extraction of enzyme hydrolysis of ball-milled substrate (CEL method), and the effects of BAE on lignin molecular weight (MW) were determined. Results indicated that hydrothermal pretreatment could facilitate lignin isolation substantially when CEL method was used. Lignin fragments with low MW were more sensitive to BAE, and therefore, evident increase in both weight average molecular weight (Mw) and number average molecular weight (Mn) was observed; especially, the increase rate of Mn was more than 2.5 times of Mw when degradation prevailed. However, subtle changes were found in Fourier transform infrared spectroscopy and carbon-13 nuclear magnetic resonance spectra between the lignin samples with and without BAE; the solubility of lignin in benzene–ethanol solution was more dependent on the MW level than on the functional groups in lignin structure.

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Metadaten
Titel
Evaluating effects of benzene–ethanol extraction on molecular weight of lignin isolated from pretreated bamboo substrate
verfasst von
Xiaojuan Ma
Xin Zheng
Ling Lin
Lihui Chen
Shrikant Survase
Liulian Huang
Shilin Cao
Publikationsdatum
01.09.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Wood Science and Technology / Ausgabe 5/2015
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI
https://doi.org/10.1007/s00226-015-0735-7

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