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Título : Acetylated heteroxylan from Agave sisalana and its behaviour during alkaline pulping and TCF/ECF bleaching
Autor : Marques, Gisela, Gutiérrez Suárez, Ana, Río Andrade, José Carlos del, Evtuguin, Dmitry V.
Palabras clave : Agave sisalana
Soda pulping
Black liquor
Structural analysis
NMR spectroscopy
Fecha de publicación : 2010
Editor: Elsevier
Resumen: The heteroxylan from sisal (Agave sisalana), an O-acetyl-(4-O-methylglucurono)xylan with a molecular weight (Mw) of 18 kDa, was isolated by extraction of peracetic holocellulose with Me2SO and thoroughly characterized by wet chemistry, and NMR spectroscopy. The heteroxylan backbone is composed of (1→4)-linked β-D-xylopyranosyl units (Xylp) partially branched with terminal (1→2)-linked 4-O-methyl-α-D-glucuronosyl (MeGlcpA, 9%mol.) and a small proportion of α-D-glucuronosyl (GlcpA, <1%mol.) residues. Roughly 61%mol. of Xylp residues are acetylated (DS =0.70). During soda/AQ pulping of sisal fibers, MeGlcpA and GlcpA are mostly removed or converted to 4-deoxy-β-L-threo-hex-4-enopyranosyluronic acid (HexA), although about 15% of the initially present MeGlcpA was maintained intact upon cooking. The major part of acetyl groups (95%) was hydrolyzed during pulping. It was proposed that during bleaching, a low molecular weight xylan fraction associated to residual lignin was removed from pulp and small proportion of MeGlcpA was additionally converted to HexA. The profiles of uronosyl residues in xylans from TCF and ECF bleached sisal pulps were rather different.
Descripción : Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080-Seville, Spain and CICECO and University of Aveiro, Department of Chemistry,3810-193 Aveiro, Portugal E-mail address: (G. Marques)
Citación : Carbohydrate Polymers 81: 517-523 (2010)
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