Acetylation and characterization of spruce (Picea abies) galactoglucomannans

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Chunlin Xu, Ann-Sofie Leppänen, Patrik Eklund, Peter Holmlund, Rainer Sjöholm, Kenneth Sundberg, Stefan Willför
Publisher: ELSEVIER SCI LTD
Publication year: 2010
Journal: Carbohydrate Research
Journal acronym: CARBOHYD RES
Volume number: 345
Issue number: 6
Start page: 810
End page: 816
Number of pages: 7
ISSN: 0008-6215


Abstract

Acetylated galactoglucomannans (GGMs) are the main hemicellulose type in most softwood species and can be utilized as, for example, bioactive polymers, hydrocolloids, papermaking chemicals, or coating polymers. Acetylation of spruce GGM using acetic anhydride with pyridine as catalyst under different conditions was conducted to obtain different degrees of acetylation on a laboratory scale, whereas, as a classic method, it can be potentially transferred to the industrial scale. The effects of the amount of catalyst and acetic anhydride, reaction time, temperature and pretreatment by acetic acid were investigated. A fully acetylated product was obtained by refluxing GGM for two hours. The structures of the acetylated GGMs were determined by SEC-MALLS/RI, (1)H and (13)C NMR and FTIR spectroscopy. NMR studies also indicated migration of acetyl groups from O-2 or O-3 to O-6 after a heating treatment in a water bath. The thermal stability of the products was investigated by DSC-TGA. (C) 2010 Elsevier Ltd. All rights reserved.


Keywords

Acetylation, Galactoglucomannans, O-Acetyl migration, SEC-MALLS/RI, Structural features, Thermal stability

Last updated on 2019-18-10 at 04:27