Determination of Eucalyptus spp lignin S/ G ratio: A comparison between methods

The syringyl/guaiacyl ratio was determined for six different Eucalyptus spp. wood clones cultivated in four regions in Brazil. The determinants were made by pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS) and the results were compared with those obtained by alkaline nitrobenzene oxidation...

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Bibliographic Details
Published in:	Bioresource technology Vol. 101; no. 11; pp. 4056 - 4061
Main Authors:	Nunes, Cleiton A., Lima, Cláudio F., Barbosa, Luiz C.A., Colodette, Jorge L., Gouveia, A.F.G., Silvério, Flaviano O.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-06-2010 [New York, NY]: Elsevier Ltd Elsevier
Subjects:	Analytical pyrolysis benzene Biological and medical sciences chemical constituents of plants Chromatography, High Pressure Liquid Eucalyptus Eucalyptus - chemistry Eucalyptus grandis Eucalyptus spp Eucalyptus urophylla Fundamental and applied biological sciences. Psychology gas chromatography Gas Chromatography-Mass Spectrometry guaiacyl lignin guaiacylpropane hybrids Lignin Lignin - analysis mass spectrometry nitrobenzene oxidation Oxidation-Reduction pyrolysis S/ G ratio syringyl lignin syringylpropane Brazil Lignin S/ G ratio Eucalyptus spp Analytical pyrolysis Eucalyptus Pyrolysis Dicotyledones Angiospermae S/G ratio Myrtaceae Spermatophyta Woody plant
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Summary:	The syringyl/guaiacyl ratio was determined for six different Eucalyptus spp. wood clones cultivated in four regions in Brazil. The determinants were made by pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS) and the results were compared with those obtained by alkaline nitrobenzene oxidation method. The S/ G ratios were obtained considering all the identified lignin derivatives in the pyrograms and also using two groups of markers. The first group of markers consisted of guaiacol, 4-methylguaiacol, 4-vinylguaiacol, trans-isoeugenol, syringol, 4-methylsyringol, 4-vinylsyringol and trans-4-propenylsyringol compounds as markers. The second group included guaiacol, 4-methylguaiacol, 4-vinylguaiacol, vanillin, 4-ethylsyringol, 4-vinylsyringol, syringaldehyde, syringylacetone and trans-4-propenylsyringol. It was observed from the statistical analysis that the values of S/ G obtained by Py–GC–MS using the two groups of markers did not differ significantly from those obtained by nitrobenzene oxidation method.
Bibliography:	http://dx.doi.org/10.1016/j.biortech.2010.01.012 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0960-8524 1873-2976
DOI:	10.1016/j.biortech.2010.01.012