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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.
|Authors:||Ibarra, 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.|
|Citation:||In: 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.|
|Abstract:||Chemical 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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