Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR

Yellowing of lignin-rich mechanical pulp is mainly attributed to light-induced changes in lignin structure. Hence, in this study the photodegradation of milled wood lignin (MWL) prepared from hardwood bleached chemimechanical pulp (BCMP) was investigated. The lignin preparation was then impregnated...

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Autores principales:	Mohammad Azadfallah, Arezo Noori
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2009
Materias:	MWL Photodegradation CMP 13C-NMR Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/e7683d51983a4553ba5e971ed2310ff1
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spelling	oai:doaj.org-article:e7683d51983a4553ba5e971ed2310ff12021-12-02T02:41:43ZAnalysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR1735-09132383-112X10.22092/ijwpr.2009.117380https://doaj.org/article/e7683d51983a4553ba5e971ed2310ff12009-09-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_117380_fdfa3a6c370122c554d7262c92a3f202.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XYellowing of lignin-rich mechanical pulp is mainly attributed to light-induced changes in lignin structure. Hence, in this study the photodegradation of milled wood lignin (MWL) prepared from hardwood bleached chemimechanical pulp (BCMP) was investigated. The lignin preparation was then impregnated on Whatman filter paper and irradiated with UV light during 4 hour exposure time. Then, photodegraded lignin was recovered and characterized by 13C-NMR.Irradiation caused to β-O-4 bonds cleavage, increase in carboxylic and phenolic hydroxyl groups, decrease in methoxyl, primary and secondary hydroxyl group. The amount of β-β and β-5 condensation structures was increased during irradiation.Mohammad AzadfallahArezo NooriRegional Information Center for Science and Technology (RICeST)articleMWLPhotodegradationCMP13C-NMRForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 24, Iss 2, Pp 254-263 (2009)
institution	DOAJ
collection	DOAJ
language	FA
topic	MWL Photodegradation CMP 13C-NMR Forestry SD1-669.5
spellingShingle	MWL Photodegradation CMP 13C-NMR Forestry SD1-669.5 Mohammad Azadfallah Arezo Noori Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR
description	Yellowing of lignin-rich mechanical pulp is mainly attributed to light-induced changes in lignin structure. Hence, in this study the photodegradation of milled wood lignin (MWL) prepared from hardwood bleached chemimechanical pulp (BCMP) was investigated. The lignin preparation was then impregnated on Whatman filter paper and irradiated with UV light during 4 hour exposure time. Then, photodegraded lignin was recovered and characterized by 13C-NMR.Irradiation caused to β-O-4 bonds cleavage, increase in carboxylic and phenolic hydroxyl groups, decrease in methoxyl, primary and secondary hydroxyl group. The amount of β-β and β-5 condensation structures was increased during irradiation.
format	article
author	Mohammad Azadfallah Arezo Noori
author_facet	Mohammad Azadfallah Arezo Noori
author_sort	Mohammad Azadfallah
title	Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR
title_short	Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR
title_full	Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR
title_fullStr	Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR
title_full_unstemmed	Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR
title_sort	analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13c-nmr
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2009
url	https://doaj.org/article/e7683d51983a4553ba5e971ed2310ff1
work_keys_str_mv	AT mohammadazadfallah analysisofphotodegradedligninfromhardwoodbleachedchemimechanicalpulpby13cnmr AT arezonoori analysisofphotodegradedligninfromhardwoodbleachedchemimechanicalpulpby13cnmr
_version_	1718402321450270720

Analysis of photodegraded lignin from hardwood bleached chemimechanical pulp by 13C-NMR

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