| Título: | COMPARISON BETWEEN ANALYTICAL PYROLYSIS AND NITROBENZENE OXIDATION FOR DETERMINATION OF SYRINGYL/GUAIACYL RATIO IN Eucalyptus spp. LIGNIN |
| Autores: |
Lima, Claudio Ferreira Barbosa, Luiz Claudio A Marcelo, Cristiana R Silvério, Flaviano O Colodette, Jorge L |
| Fecha: | 2008-04-30 |
| Publicador: | Bioresources |
| Fuente: |
 |
| Tipo: |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| Tema: | Analytical pyrolysis, S/G ratio, Lignin, eucalyptus ssp |
| Descripción: | Pyrolysis-gas chromatography/mass spectrometry (Py-GC-MS) was applied to measure lignin syringyl/guaiacyl (S/G) ratio in E. dunni, E. grandis, E. nitens, E. urograndis and E. urophylla woods. A total of 41 compounds were identified, being 11 derived from carbohydrates and 30 from lignins. The S/G ratio was calculated on the basis of the areas of peaks recorded in the pyrograms and compared with the results obtained by alkaline nitrobenzene oxidation. The values of S/G found by pyrolysis were similar for all the species using the compounds guaiacol, 4-methylguaiacol, 4-vinylguaiacol, vanillin, 4-ethylsyringol, 4-vinylsyringol, homosyringaldehyde, acetosyringone and syringylacetone, as lignin markers. The selected markers were efficient for the determination of S/G ratio in eucalyptus wood by Py-GC-MS. The Py-GC-MS technique produced results that are comparable to the nitrobenzene oxidation method, with the advantage of requiring small wood samples and a short analysis time. |
| Idioma: | Inglés |