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© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Sulfation of arabinogalactan (AG) from larch wood (Larix sibirica Ledeb.) in the melt of a sulfamic acid–urea mixture has been first examined. The impact of the AG sulfation temperature on the AG sulfate yield and the sulfur content has been established. The high sulfur content (11.3–11.6%) in sulfated AG has been obtained in the temperature range of 115–120 °C for a sulfation time of 0.5 h. The process effectively prevents molecular degradation under these conditions. The incorporation of sulfate groups into the arabinogalactan structure has been confirmed by the appearance of absorption bands in the FTIR spectrum that are typical of sulfate group vibrations. The 13C NMR spectroscopy study has proven that the AG sulfation in the melt of a sulfamic acid–urea mixture leads to the substitution of some free hydroxyl groups for C6, C4, and C2 carbon atoms of the AG β-D-galactopyranose units. The advantage of the proposed AG sulfation method is that the reaction occurs without solvent, and the reaction time is only 0.5 h. The kinetics of the thermal decomposition of the initial AG and sulfated AG samples have been studied. It has been found that the sulfated AG samples have a lower thermal resistance than the initial AG. The kinetic analysis has revealed a decrease in the activation energy of the thermal degradation of the sulfated samples as compared to the initial AG.

Details

Title
Green Sulfation of Arabinogalactan in the Melt of a Sulfamic Acid–Urea Mixture
Author
Levdansky, Vladimir A 1 ; Levdansky, Alexander V 1 ; Malyar, Yuriy N 2   VIAFID ORCID Logo  ; Timur Yu Ivanenko 1   VIAFID ORCID Logo  ; Olga Yu Fetisova 1   VIAFID ORCID Logo  ; Kazachenko, Aleksandr S 3   VIAFID ORCID Logo  ; Kuznetsov, Boris N 2 

 Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center, Krasnoyarsk Science Center SB RAS, Akademgorodok 50, Bld. 24, Krasnoyarsk 660036, Russia; [email protected] (V.A.L.); [email protected] (A.V.L.); [email protected] (Y.N.M.); [email protected] (T.Y.I.); [email protected] (O.Y.F.) 
 Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center, Krasnoyarsk Science Center SB RAS, Akademgorodok 50, Bld. 24, Krasnoyarsk 660036, Russia; [email protected] (V.A.L.); [email protected] (A.V.L.); [email protected] (Y.N.M.); [email protected] (T.Y.I.); [email protected] (O.Y.F.); School of Non-Ferrous Metals and Material Science, Siberian Federal University, Pr. Svobodny 79, Krasnoyarsk 660041, Russia 
 Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center, Krasnoyarsk Science Center SB RAS, Akademgorodok 50, Bld. 24, Krasnoyarsk 660036, Russia; [email protected] (V.A.L.); [email protected] (A.V.L.); [email protected] (Y.N.M.); [email protected] (T.Y.I.); [email protected] (O.Y.F.); School of Non-Ferrous Metals and Material Science, Siberian Federal University, Pr. Svobodny 79, Krasnoyarsk 660041, Russia; Institute of Chemical Technologies, Reshetnev Siberian State University of Science and Technology, Mira St. 82, Krasnoyarsk 660049, Russia; Professor V. F. Voino-Yasenetsky Krasnoyarsk State Medical University of the Ministry of Healthcare of the Russian Federation, St. Partizan Zheleznyak, Bld. 1, Krasnoyarsk 660022, Russia 
First page
642
Publication year
2025
Publication date
2025
Publisher
MDPI AG
e-ISSN
20734360
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3176344671
Copyright
© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.