title: Determination of the xanthate group distribution on viscose by liquid-state 1H NMR spectroscopy.
abstract: An analytical method for determination of the xanthate group distribution on viscoses based on liquid-state NMR spectroscopy was developed. Sample preparation involves stabilization of the xanthate group by allylation followed by derivatization of the remaining free hydroxyl groups at the glucose unit. The method was applied for studying (1) the γ-value (number of xanthate groups per 100 glucose units) of viscose, (2) the distribution of the xanthate groups on the anhydroglucose unit (AGU), and (3) changes of the xanthate group distribution during ripening. Results of the γ-value determination are well comparable with reference methods. Elucidation of the xanthate group distribution on the AGU gives the percentage at the C-6 position and a cumulative share of the positions C-2 and C-3. During ripening, xanthate groups at C-2 and C-3 degrade first, while xanthates at C-6 decompose at a slower rate.
authors.affiliation: Kompetenzzentrum Holz GmbH, Linz, Austria.
authors.forename: Andreas
authors.initials: A
authors.lastname: Schwaighofer
authors.forename: Gerhard
authors.initials: G
authors.lastname: Zuckerstätter
authors.forename: Judith
authors.initials: J
authors.lastname: Schlagnitweit
authors.forename: Herbert
authors.initials: H
authors.lastname: Sixta
authors.forename: Norbert
authors.initials: N
authors.lastname: Müller
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011522:Protons; D012997:Solvents / Q000737:chemistry; D014970:Xanthines / Q000032:analysis*
chemical_list: D011522:Protons; D012997:Solvents; D014970:Xanthines; D002482:Cellulose