Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments

Abstract An integrated pretreatment process based on hydrothermal pretreatment (HTP) followed by alkaline pretreatment has been applied to treat Eucalyptus. The chemical composition and structure changes of lignin during the pretreatment were comprehensively characterized. The surface morphology of...

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Autores principales:	Chenzhou Wang, Hanyin Li, Mingfei Li, Jing Bian, Runcang Sun
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/965a5cc3919e40a280b621b911334167
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spelling	oai:doaj.org-article:965a5cc3919e40a280b621b9113341672021-12-02T12:32:57ZRevealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments10.1038/s41598-017-00711-w2045-2322https://doaj.org/article/965a5cc3919e40a280b621b9113341672017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00711-whttps://doaj.org/toc/2045-2322Abstract An integrated pretreatment process based on hydrothermal pretreatment (HTP) followed by alkaline pretreatment has been applied to treat Eucalyptus. The chemical composition and structure changes of lignin during the pretreatment were comprehensively characterized. The surface morphology of the cell walls and lignin distribution of the pretreated Eucalyptus were detected by scanning electron and confocal Raman microscopies. It was found that the chemical bonds between lignin and hemicelluloses were cleaved during the pretreatment. The results also indicated that the contents of β-O-4′, β-β′, and β-5′ linkages were decreased with the increase of hydrothermal pretreatment temperature and the cleavage of β-O-4′ linkages in lignin was accompanied with repolymerization reactions. 31P NMR analysis showed that the content of aliphatic OH was reduced as the temperature increased and the total phenolic OH was elevated and then declined with the increase of temperature. Raman spectra analysis revealed that the dissolution rate of lignin in the secondary wall regions was faster than that in cell corner middle lamella regions during the pretreatment. These results will enhance the understanding of the cell wall deconstruction during the pretreatment and the mechanism of the integrated pretreatment process acting on Eucalyptus.Chenzhou WangHanyin LiMingfei LiJing BianRuncang SunNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chenzhou Wang Hanyin Li Mingfei Li Jing Bian Runcang Sun Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments
description	Abstract An integrated pretreatment process based on hydrothermal pretreatment (HTP) followed by alkaline pretreatment has been applied to treat Eucalyptus. The chemical composition and structure changes of lignin during the pretreatment were comprehensively characterized. The surface morphology of the cell walls and lignin distribution of the pretreated Eucalyptus were detected by scanning electron and confocal Raman microscopies. It was found that the chemical bonds between lignin and hemicelluloses were cleaved during the pretreatment. The results also indicated that the contents of β-O-4′, β-β′, and β-5′ linkages were decreased with the increase of hydrothermal pretreatment temperature and the cleavage of β-O-4′ linkages in lignin was accompanied with repolymerization reactions. 31P NMR analysis showed that the content of aliphatic OH was reduced as the temperature increased and the total phenolic OH was elevated and then declined with the increase of temperature. Raman spectra analysis revealed that the dissolution rate of lignin in the secondary wall regions was faster than that in cell corner middle lamella regions during the pretreatment. These results will enhance the understanding of the cell wall deconstruction during the pretreatment and the mechanism of the integrated pretreatment process acting on Eucalyptus.
format	article
author	Chenzhou Wang Hanyin Li Mingfei Li Jing Bian Runcang Sun
author_facet	Chenzhou Wang Hanyin Li Mingfei Li Jing Bian Runcang Sun
author_sort	Chenzhou Wang
title	Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments
title_short	Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments
title_full	Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments
title_fullStr	Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments
title_full_unstemmed	Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments
title_sort	revealing the structure and distribution changes of eucalyptus lignin during the hydrothermal and alkaline pretreatments
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/965a5cc3919e40a280b621b911334167
work_keys_str_mv	AT chenzhouwang revealingthestructureanddistributionchangesofeucalyptusligninduringthehydrothermalandalkalinepretreatments AT hanyinli revealingthestructureanddistributionchangesofeucalyptusligninduringthehydrothermalandalkalinepretreatments AT mingfeili revealingthestructureanddistributionchangesofeucalyptusligninduringthehydrothermalandalkalinepretreatments AT jingbian revealingthestructureanddistributionchangesofeucalyptusligninduringthehydrothermalandalkalinepretreatments AT runcangsun revealingthestructureanddistributionchangesofeucalyptusligninduringthehydrothermalandalkalinepretreatments
_version_	1718393933930692608

Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments

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