Abstract
AbstractThe synthesis of polysaccharide sulfates without harmful solvents used is a serious environmental problem. A method for the synthesis of xylan sulfate using the sulfamic acid–urea melt as a sulfating agent without solvents is proposed. The melt is prepared by heating the sulfamic acid–urea mixture with a molar ratio of 1 : 1 at a temperature of 110 °C. This ratio allows significant reduction of side reactions, in particular, carbamation of xylan. Sulfation is carried out at temperatures of 110,115, 120, 125, and 130 °C. The maximum yield and degree of substitution (DSsulfate 1.40) are attained at atemperature of 115 °C. The proposed method makes it possible to synthesize xylan sulfate rapidly (for 0.5 h) and without contamination of the obtained product with toxic solvents, e. g., dimethyl sulfoxide, pyridine, etc. The composition and structure of initial and sulfated xylan are confirmed by FTIR, NMR, GC, and elemental analysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
