Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/23150
Tipo: Artigo
Título: In situ determination of the syringyl/guaiacyl ratio of residual lignin in pre-bleached eucalypt kraft pulps by analytical pyrolysis
Autor(es): Lima, Cláudio Ferreira
Barbosa, Luiz CLaudio Almeida
Silva, Marcela N. N.
Colodette, Jorge Luiz
Silvério, Flaviano Oliveira
Abstract: Pyrolysis coupled with gas chromatography and mass spectrometry (Py-GC/MS) was used for evaluating the syringyl/guaiacyl (S/G) ratios of residual lignins in oxygen pre-bleached kraft pulps from 24 Eucalyptus wood clones. The optimization of the method showed that the best conditions were achieved when pyrolysis is carried out at 550 °C, using a 60 m length SPB-1701 capillary column and the mass spectrometer operating in SIM mode. Pulp pyrograms were analyzed and the compounds produced by pyrolysis of residual lignins identified by mass spectrometry. A total of 18 compounds were identified, being nine derived from guaiacyl units and nine derived from syringyl lignin. The S/G ratios were calculated using the relative area of S-lignin (syringol, 4-methylsyringol, 4-vinylsyringol and trans-4-(prop-2-enyl) syringol) and G-lignin (guaiacol, 4-methylguaiacol, 4-vinylguaiacol and trans-isoeugenol) as lignin markers. These studies showed that Py-GC/MS-SIM is an efficient tool to characterizing the chemical composition of residual lignin in oxygen pre-bleached Eucalyptus pulps.
Palavras-chave: Py-GC/MS-SIM
S/G ratio
Residual lignin
Oxygen pre-bleached cellulosic pulp
Editor: Journal of Analytical and Applied Pyrolysis
Tipo de Acesso: 2015 Elsevier B.V. All rights reserved.
URI: https://doi.org/10.1016/j.jaap.2015.02.002
http://www.locus.ufv.br/handle/123456789/23150
Data do documento: Mar-2015
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