Acetylation and characterization of spruce (Picea abies) galactoglucomannans

Chunlin Xu, Ann-Sofie Leppänen, Patrik Christoffer Eklund, Peter Holmlund, Rainer Sjöholm, Kenneth Sundberg, Stefan Willför

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

70 Citeringar (Scopus)

Sammanfattning

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.
OriginalspråkOdefinierat/okänt
Sidor (från-till)810–816
Antal sidor7
TidskriftCarbohydrate Research
Volym345
Utgåva6
DOI
StatusPublicerad - 2010
MoE-publikationstypA1 Tidskriftsartikel-refererad

Nyckelord

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

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