title: Cationised O-acetyl galactoglucomannans: synthesis and characterisation.
abstract: 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 (13)C 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.
authors.affiliation: Process Chemistry Centre, c/o Laboratory of Wood and Paper Chemistry, Åbo Akademi University, Porthansgatan 3-5, FI-20500, Turku/Åbo, Finland. Electronic address: vkisonen@abo.fi.
authors.forename: Victor
authors.initials: V
authors.lastname: Kisonen
authors.forename: Chunlin
authors.initials: C
authors.lastname: Xu
authors.forename: Patrik
authors.initials: P
authors.lastname: Eklund
authors.forename: Hanna
authors.initials: H
authors.lastname: Lindqvist
authors.forename: Anna
authors.initials: A
authors.lastname: Sundberg
authors.forename: Andrey
authors.initials: A
authors.lastname: Pranovich
authors.forename: Jari
authors.initials: J
authors.lastname: Sinkkonen
authors.forename: Francisco
authors.initials: F
authors.lastname: Vilaplana
authors.forename: Stefan
authors.initials: S
authors.lastname: Willför
mesh_terms: D000107:Acetylation; D001672:Biocompatible Materials / Q000737:chemistry* / Q000302:isolation & purification; D002412:Cations; D009682:Magnetic Resonance Spectroscopy; D008351:Mannans / Q000737:chemistry* / Q000302:isolation & purification; D009584:Nitrogen / Q000737:chemistry; D028222:Picea / Q000737:chemistry*; D012995:Solubility; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D002412:Cations; D008351:Mannans; C443804:galactoglucomannan; D014867:Water; D009584:Nitrogen
keywords: (13)C NMR; Cationized; Galactoglucomannans; Hemicelluloses; MALDI-TOF-MS