Acetylation and characterization of spruce (Picea abies) galactoglucomannans

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Chunlin Xu, Ann-Sofie Leppänen, Patrik Eklund, Peter Holmlund, Rainer Sjöholm, Kenneth Sundberg, Stefan Willför
Förläggare: ELSEVIER SCI LTD
Publiceringsår: 2010
Tidskrift: Carbohydrate Research
Tidskriftsakronym: CARBOHYD RES
Volym: 345
Nummer: 6
Artikelns första sida, sidnummer: 810
Artikelns sista sida, sidnummer: 816
Antal sidor: 7
ISSN: 0008-6215


Abstrakt

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.


Nyckelord

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

Senast uppdaterad 2020-28-01 vid 05:05