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Título: Determination of Eucalyptus spp lignin S/G ratio: a comparison between methods
Autor(es): Nunes, C. A.
Lima, C. F.
Barbosa, L. C. A.
Colodette, J. L.
Gouveia, A. F. G.
Silvério, F. O.
Assunto: Lignin
S/G ratio
Analytical pyrolysis
Publicador: ScienceDirect
Data de publicação: 5-Jan-2010
Referência: NUNES, C. A. et al. Determination of Eucalyptus spp lignin S/G ratio: a comparison between methods. Bioresource Technology, Essex, v. 101, n. 11, p. 4056-4061, June 2010.
Abstract: 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 spectrome- try (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-propenylsyrin- gol compounds as markers. The second group included guaiacol, 4-methylguaiacol, 4-vinylguaiacol, van- illin, 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.
URI: http://www.sciencedirect.com/science/article/pii/S0960852410000556
http://repositorio.ufla.br/jspui/handle/1/4744
Idioma: en
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