Cationised O-acetyl galactoglucomannans: Synthesis and characterisation
2014 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 99, 755-764 p.Article in journal (Refereed) Published
Water-soluble O-acetyl-galactoglucomannans (GGMs) can be obtained from Norway spruce by hot-water-extraction of the wood or as a side product by ultrafiltration of mechanical pulping waters. Cationic and amphiphilic polysaccharides and their derivatives are of interest for a number of applications and thus quaternary nitrogen moieties with cationic charge were grafted onto GGMs in the heterogeneous reaction to render a cationic polyelectrolyte. The degree of substitution was measured by elemental analysis of nitrogen, by quantitative C-13 NMR and interestingly also by polyelectrolyte titration and the results were congruent. NMR, matrix-assisted laser desorption/ionisation mass spectroscopy (MALDI-TOF-MS), and FT-IR analysis were used to characterise the product. THF or DMSO with water enhanced the reaction efficiency and decreased M-w reduction in comparison to plain water as a reaction media. Cationised GGM was also successfully acetylated. The cationic derivatives of hemicelluloses can potentially be utilised as polyelectrolyte layers in packaging and pharmaceutical applications.
Place, publisher, year, edition, pages
2014. Vol. 99, 755-764 p.
Cationized, Galactoglucomannans, Hemicelluloses, C-13 NMR, MALDI-TOF-MS
IdentifiersURN: urn:nbn:se:kth:diva-140660DOI: 10.1016/j.carbpol.2013.09.009ISI: 000329256600095ScopusID: 2-s2.0-84884298504OAI: oai:DiVA.org:kth-140660DiVA: diva2:692545
QC 201401312014-01-312014-01-302014-01-31Bibliographically approved