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Título: | Structural modification of eucalypt pulp lignin in a totally chlorine free bleaching sequence including a laccase-mediator stage |
Autor: | Ibarra, David CSIC ORCID; Chávez Uribe, María Isabel; Rencoret, Jorge CSIC ORCID; Río Andrade, José Carlos del CSIC ORCID ; Gutiérrez Suárez, Ana CSIC ORCID ; Romero Sánchez, Javier; Camarero, Susana CSIC ORCID ; Martínez, María Jesús CSIC ORCID ; Jiménez-Barbero, Jesús CSIC ORCID; Martínez, Ángel T. CSIC ORCID | Palabras clave: | 2D NMR Enzymes Eucalyptus globulus FTIR HMBC HSQC Laccase-mediator system Paper pulp Py-GC/MS TCF bleaching |
Fecha de publicación: | 2007 | Citación: | Holzforschung 61(6): 634-646 (2007) | Resumen: | Modification of eucalypt pulp residual lignin in a totally chlorine free (TCF) bleaching sequence including a laccase-mediator stage, in combination with previous oxygen delignification and subsequent peroxide bleaching, was investigated and compared with a chemical TCF sequence. The enzymatic treatment resulted in a strong oxidative modification, as shown by lignin unit 13C2,6-1H2,6 correlations in HSQC 2D-NMR spectra and presence of oxidized pyrolysis markers. The frequency of inter-unit linkages in residual lignin was also modified, as shown by different side-chain 13C-1H correlations. Moreover, H2,6 correlations with side-chain carbons in HMBC spectra revealed the presence of Cα keto and carboxyl groups in lignin from the oxygen-delignified and especially from the enzymatically-treated pulp, together with normal (Cα-hydroxylated) lignin units. Moreover, the results obtained showed that most of this oxidatively-altered lignin is removed under the alkaline conditions used in the peroxide stage. In this way, the pulp kappa number decreased, and the final residual lignin was more structurally-related to that found before the oxidative stages (although with lower content of resinol structures, and higher presence of aryl-aryl ether structures and carboxyl-bearing terminal units). However, the action of hydrogen peroxide is required to attain the high brightness, over 91% ISO, found in final pulp after the enzyme-containing TCF sequence. | URI: | http://hdl.handle.net/10261/3303 | DOI: | 10.1515/HF.2007.096 | ISSN: | 0018-3830 | E-ISSN: | 1437-434X |
Aparece en las colecciones: | (IRNAS) Artículos (CIB) Artículos |
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Structural modification of eucalypt pulp.pdf | 455,71 kB | Adobe PDF | Visualizar/Abrir |
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