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Title: | Lignin modification during Eucalyptus globulus kraft pulping followed by totally chlorine free bleaching: a two dimensional nuclear magnetic resonance, Fourier transform infrared, and pyrolysis-gas chromatography/mass spectrometry study |
Authors: | Ibarra, David CSIC ORCID CVN; 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 | Keywords: | Lignin structure 2D NMR HSQC HMBC HSQC-TOCSY Analytical pyrolysis Infrared spectroscopy Eucalyptus globulus Kraft pulping Totalli chlorine free bleaching Paper pulp residual lignin |
Issue Date: | 2007 | Publisher: | American Chemical Society | Citation: | Journal of Agriculture and Food Chemistry 55:3477-3490 (2007) | Abstract: | Chemical modification of eucalypt lignin was investigated during kraft pulping and chlorine-free bleaching by comparing milled-wood lignin, kraft lignin, and enzymatic residual lignins. The syringyl-to-guaiacyl ratio (S/G) from analytical pyrolysis slightly changed during pulping and bleaching (S/G 3-4) but was much higher in the kraft lignin. Semiquantitative HSQC NMR showed that the relative amount of β-O-4' (around 80% side-chains) and resinol-type substructures (around 15%) was only slightly modified during pulping and oxygen delignification. Other minor inter-unit linkages and terminal units were also detected. However, a decrease of resinol substructures (to only 6%) was found after alkaline-peroxide bleaching. The relative amount of surviving linkages in the highly-phenolic kraft lignin was dramatically modified, resinols being predominant. Oxygen delignification did not change inter-unit linkages, but an increase of oxidized units was found in the HSQC aromatic region, in agreement with the higher amount of pyrolysis markers with oxidized side-chains. HMBC NMR correlations showed that the oxidized units after oxygen delignification bore conjugated ketone groups, and conjugated carboxyls after peroxide bleaching. Presence of xylan and lignin-carbohydrate linkage signals was shown by the HSQC spectra of pulp lignins | Description: | Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, E-28040 Madrid, Spain, Instituto de Química, UNAM, Ciudad Universitaria, Coyoacán, CP 04510, México, DF, Instituto de Recursos Naturales y Agrobiología, CSIC, PO Box 1052, E-41080 Seville, Spain, CIT, ENCE, Ctra. Campañó, Ribeiro Vao, E-36157 Pontevedra, Spain; E-mail address: ATMartinez@cib.csic.es (A.T.Martínez | URI: | http://hdl.handle.net/10261/35167 | DOI: | 10.1021/jf063728t |
Appears in Collections: | (IRNAS) Artículos (CIB) Artículos |
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