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Chemical characterization of eucalypt pulp lignin during totally chlorine free bleaching including a laccase-mediator stage: 2D-NMR, FTIR and Py-GC/MS of enzymatically-isolated residual lignins.

AuthorsIbarra, David ; Chávez, M.I.; Rencoret, Jorge ; Río Andrade, José Carlos del ; Gutiérrez Suárez, Ana ; Camarero, Susana ; Martínez, María Jesús ; Jiménez-Barbero, Jesús ; Martínez, Ángel T.
TCF bleaching
Issue Date27-Aug-2006
CitationIn: Proceedings of the 9th European Workshop on Lignocellulosics and Pulp, Vienna, Austria, August 27-30, Advances in Chemistry and Processing of Lignocellulosics, pp. 286-289.
AbstractChemical modification of residual lignin isolated from eucalypt pulp after the different stages of a TCF sequence including a laccase-mediator stage was investigated by FTIR, Py-GC/MS and 2D-NMR (using HSQC, HSQC-TOCSY and HMBC). The enzymatic treatment resulted in strong oxidative modification of a lignin fraction, which could be removed under alkaline conditions enabling a final increase of brightness by hydrogen peroxide. In addition to changes in the ratios between syringyl and guaiacyl units and between β-O-4, syringaresinol and phenylcoumaran substructures, formation of acetosyringone and muconate terminal units were observed during the TCF sequence due to oxidative breakdown of lignin side-chains and aromatic nuclei respectively.
Appears in Collections:(IRNAS) Comunicaciones congresos
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