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Fractionation and characterization of lignin from steam-exploded corn stalk by sequential dissolution in ethanol-water solvent
Wang, Guanhua1,2; Chen, Hongzhang1
2013-12-13
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
Volume120Issue:0Pages:402-409
AbstractDue to the intricate process of traditional lignin fractionation by multi-organic solvent extraction, single solvent system consisted of ethanol and water was established in this work to fractionate and purify lignin from steam-exploded corn stalk. Three alkali-extracted lignin fractions (Fraction 1, 2 and 3) were obtained by sequential dissolution and subsequently characterized by the following analysis technologies: GPC, HPLC, UV, FTIR and H-1 NMR spectra and thermogravimetric analysis. The GPC analysis showed the molecular weight of lignin fractions increased gradually from Fraction 1 to 3 and their polydispersity decreased dramatically compared with the unfractionated lignin. Besides, the purity of lignin Fraction 1 and 2 increased from 87.57% to 93.12% and 91.59% respectively due to the polysaccharide elimination effect of ethanol solutions. The subsequent characterization indicated that the content of phenolic acids decreased considerably from 3.379% to 0.095% with increasing molecular weight whereas the guaiacyl unit content and thermal stability increased. Meanwhile, the results of solubility determination revealed that the solubility of lignin enhanced when the molecular weight decreased and the water content of mixed solvent increased, which successfully elucidated the fractionation mechanism. Since ethanol is the only organic solvent used in the process, this study provides a relatively simple and efficient route to fractionate lignin from steam-exploded corn stalk for the subsequent utilization to produce stable and high-value lignin products. (C) 2013 Elsevier B.V. All rights reserved.
KeywordAlkali-extracted Lignin Steam-exploded Corn Stalk Fractionation And Characterization Sequential Dissolution Solubility
SubtypeArticle
Indexed BySCI
Language英语
WOS KeywordMOLECULAR-WEIGHT ; SUCCESSIVE EXTRACTION ; ORGANIC-SOLVENTS ; KRAFT LIGNIN ; ALCELL(R) LIGNIN ; PHENOLIC-ACIDS ; ANTIOXIDANT ; STRAW ; FIBER
WOS IDWOS:000330814900052
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Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13736
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Wang, Guanhua,Chen, Hongzhang. Fractionation and characterization of lignin from steam-exploded corn stalk by sequential dissolution in ethanol-water solvent[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2013,120(0):402-409.
APA Wang, Guanhua,&Chen, Hongzhang.(2013).Fractionation and characterization of lignin from steam-exploded corn stalk by sequential dissolution in ethanol-water solvent.SEPARATION AND PURIFICATION TECHNOLOGY,120(0),402-409.
MLA Wang, Guanhua,et al."Fractionation and characterization of lignin from steam-exploded corn stalk by sequential dissolution in ethanol-water solvent".SEPARATION AND PURIFICATION TECHNOLOGY 120.0(2013):402-409.
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