Sulfation of arabinogalactan with sulfamic acid under homogeneous conditions in dimethylsulfoxide medium.

ABSTRACT: Sulfation of larch wood arabinogalactan (AG) with sulfamic acid in dimethylsulfoxide (DMSO) medium in the presence of urea was studied for the first time. The use of DMSO as a solvent instead of more toxic 1,4-dioxane allows to sulfate AG under homogeneous conditions. The sulfated AG with a high sulfur content (12.0-12.5 wt %) was produced by sulfation at a temperature of 85-90 °C, the molar ratio of AG / sulfating agent equal to 1:0.85 during 2-3 h. The introduction of sulfate groups into the structure of arabinogalactan was confirmed by the appearance of new absorption bands in FTIR and FT Raman spectra, characteristic for the vibrations of the sulfate groups. It was proved by ¹³C NMR spectroscopy that the predominant substitution of the primary hydroxyl groups at C6 carbon at

SUBMITTER: Levdansky AV 

PROVIDER: S-EPMC8527290 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature