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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 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | Texto completo | 1,22 MB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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