Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy
In this study, optical behavior of methylated and unmethylated Bjorkman lignin from poplar wood and two lignin model compound (phenolic and non phenolic) with β-O-4 linkages was investigated. First, these lignins were precipitated on a cellulosic matrix (Whatman Paper) using different times (0, 5, 1...
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Regional Information Center for Science and Technology (RICeST)
2014-09-01
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doaj-91294e05eab84c0382ae924f71302a162020-11-24T23:57:18ZfasRegional Information Center for Science and Technology (RICeST) تحقیقات علوم چوب و کاغذ ایران1735-09132383-112X2014-09-0129334335310.22092/ijwpr.2014.61856185Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR SpectroscopyAhmad Mirshkraee0Jalil Lari1Fatemeh Mstaghni2Ali Abdolkhani3Professor, Dept. of Chemistry, Payam Noor University, P.O.Box: 73918-83649, Tehran, Iranاستادیار، گروه شیمی، دانشگاه پیام نور،دانشجوی دکتری، گروه شیمی، دانشگاه پیام نورAssociate Professor, Dept. of wood and Paper, Faculty of Natural Resources, University of Tehran, Karaj, IranIn this study, optical behavior of methylated and unmethylated Bjorkman lignin from poplar wood and two lignin model compound (phenolic and non phenolic) with β-O-4 linkages was investigated. First, these lignins were precipitated on a cellulosic matrix (Whatman Paper) using different times (0, 5, 10, 15, 20 h) and then matrixcovered surface was analyzed using Attenuated Total Reflectance FTIR technique. The results showed that irradiation altered the chemical structure of all samples. Lignin was the most sensitive component to photodegradation and the intensities of its characteristic bands decreased significantly during the process of irradiation. This was accompanied by formation of new carbonyl groups appearing at 1735 cm_1. Compared with the unmethylated forms, the rate of lignin degradation and carbonyl formation was relatively lower in methylated forms. In other words, methylation of phenolic hydroxyl group reduced the chemical changes induced by irradiation.http://ijwpr.areeo.ac.ir/article_6185_1cea5a8a23daddd8448eb24ceef47e1e.pdfBjorkmanβ-O-4 Lignin model compoundsPhotodegradationATR-FTIR spectroscopy |
collection |
DOAJ |
language |
fas |
format |
Article |
sources |
DOAJ |
author |
Ahmad Mirshkraee Jalil Lari Fatemeh Mstaghni Ali Abdolkhani |
spellingShingle |
Ahmad Mirshkraee Jalil Lari Fatemeh Mstaghni Ali Abdolkhani Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy تحقیقات علوم چوب و کاغذ ایران Bjorkman β-O-4 Lignin model compounds Photodegradation ATR-FTIR spectroscopy |
author_facet |
Ahmad Mirshkraee Jalil Lari Fatemeh Mstaghni Ali Abdolkhani |
author_sort |
Ahmad Mirshkraee |
title |
Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy |
title_short |
Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy |
title_full |
Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy |
title_fullStr |
Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy |
title_full_unstemmed |
Analysis of Photodegraded Lignin and Lignin Model Compounds by ATR-FTIR Spectroscopy |
title_sort |
analysis of photodegraded lignin and lignin model compounds by atr-ftir spectroscopy |
publisher |
Regional Information Center for Science and Technology (RICeST) |
series |
تحقیقات علوم چوب و کاغذ ایران |
issn |
1735-0913 2383-112X |
publishDate |
2014-09-01 |
description |
In this study, optical behavior of methylated and unmethylated Bjorkman lignin from poplar wood and two lignin model compound (phenolic and non phenolic) with β-O-4 linkages was investigated. First, these lignins were precipitated on a cellulosic matrix (Whatman Paper) using different times (0, 5, 10, 15, 20 h) and then matrixcovered surface was analyzed using Attenuated Total Reflectance FTIR technique. The results showed that irradiation altered the chemical structure of all samples. Lignin was the most sensitive component to photodegradation and the intensities of its characteristic bands decreased significantly during the process of irradiation. This was accompanied by formation of new carbonyl groups appearing at 1735 cm_1. Compared with the unmethylated forms, the rate of lignin degradation and carbonyl formation was relatively lower in methylated forms. In other words, methylation of phenolic hydroxyl group reduced the chemical changes induced by irradiation. |
topic |
Bjorkman β-O-4 Lignin model compounds Photodegradation ATR-FTIR spectroscopy |
url |
http://ijwpr.areeo.ac.ir/article_6185_1cea5a8a23daddd8448eb24ceef47e1e.pdf |
work_keys_str_mv |
AT ahmadmirshkraee analysisofphotodegradedligninandligninmodelcompoundsbyatrftirspectroscopy AT jalillari analysisofphotodegradedligninandligninmodelcompoundsbyatrftirspectroscopy AT fatemehmstaghni analysisofphotodegradedligninandligninmodelcompoundsbyatrftirspectroscopy AT aliabdolkhani analysisofphotodegradedligninandligninmodelcompoundsbyatrftirspectroscopy |
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1725454604968132608 |