Characterization of the hemicellulosic fraction obtained after pre-hydrolysis of Pinus radiata wood chips with hot-water at different initial pH

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Pablo Reyes, Regis Teixeira Mendonça, Jaime Rodríguez, Pedro Fardim, Beatriz Vega
Publisher: Sociedad Chilena de Quimica
Publication year: 2013
Journal: Journal of the Chilean Chemical Society
Journal acronym: J. Chil. Chem. Soc.
Volume number: 58
Issue number: 1
Start page: 1614
End page: 1618


Abstract

Hemicelluloses from Pinus radiata wood chips were extracted using different conditions of temperature, time and initial pH of water (120 to 170°C, 30 to 120
min and pH 2 to 12, respectively). Results showed that hemicelluloses represented 26% of wood dry weight and, from this amount, hexoses are responsible for 64%
of its composition. The analysis of extraction results showed that pH has a low effect in disassembling hemicelluloses from wood, and that time and temperature
of reaction were the most important parameters. Maximal amount of hemicellulose extracted in the most severe conditions tested was between 12-16% (on wood
basis). In these conditions approximately 40-50% of the hemicellulose in wood was solubilized. As observed by SEC analysis, the recovered hemicellulosic
fractions were in the form of low molar mass oligomers with Mw varying from 3720 to 54300 g/mol. The FT-IR spectra show peak multiplicity between 1120
and 1000 cm-1 that is a typical characteristic of carbohydrates and only alkaline-extracted hemicelluloses showed the presence of lignin with a characteristic peak
at 1509 cm-1.


Keywords

Biorefinery, Galactoglucomannans, Pinus radiata, wood hemicelluloses

Last updated on 2019-10-12 at 03:02