Structural analysis of photodegraded lime wood by means of FT-IR and 2D IR correlation spectroscopy

In this study the weathering behavior of lime wood (Tillia cordata Mill.) has been examined using FT-IR and 2D IR correlation spectroscopy, which evidenced chemical changes induced by exposure to weathering conditions. It was showed that lignin is most sensitive component to the photodegradation pro...

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Bibliographic Details
Published in:International journal of biological macromolecules 2011-05, Vol.48 (4), p.667-675
Main Authors: Popescu, Carmen-Mihaela, Popescu, Maria-Cristina, Vasile, Cornelia
Format: Article
Language:English
Subjects:
2D IR correlation spectroscopy
Carbon - chemistry
Fourier transform infrared spectroscopy
FT-IR spectroscopy
hemicellulose
lactones
lignin
Lignin - analysis
Lime wood
oxidation
Oxygen - chemistry
Photodegradation
Photolysis
quinine
quinones
Spectrophotometry, Infrared
Spectroscopy, Fourier Transform Infrared
Tilia - chemistry
weathering
wood
Wood - chemistry
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Summary:In this study the weathering behavior of lime wood (Tillia cordata Mill.) has been examined using FT-IR and 2D IR correlation spectroscopy, which evidenced chemical changes induced by exposure to weathering conditions. It was showed that lignin is most sensitive component to the photodegradation processes as indicated by considerable decreases in the intensities of the characteristic aromatic lignin band at 1505cm−1 and other associated bands. By 2D correlation spectroscopy has been demonstrated that the moment of CO from carboxyl and acetyl groups in hemicelluloses is changing first, followed by the CC of aromatic skeletal, CO in non-conjugated ketones, carboxyl groups and lactones, absorbed O–H and conjugated C–O groups in quinones. The carbonyl formation corresponded well with lignin degradation, indicating a close relationship between them. Comparing the rate of carbonyl formation and lignin decay clearly showed that the former is remarkably higher than the latter, indicating the formation of carbonyl bands at 1738cm−1 probably resulted from not only lignin oxidation but also from reactions occurring in other components of the wood. Quinine formation is combined with the decay of aromatic structures and the formation of conjugated carbonyl groups.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2011.02.009