Abstract
The synthesis of guar gum sulfates by a complex of sulfur trioxide with 1,4-dioxane was studied. The influence of temperature, process duration, and the volume of chlorosulfonic acid on the degree of substitution of guar gum sulfates was studied. The sulfation process has been optimized using the Box-Behnken design. It was shown that the optimal conditions for sulfation of guar gum with a complex of sulfur trioxide-1.4-dioxane: temperature 60 °C, duration 2.9 h, and a volume of chlorosulfonic acid of 3.1 ml. Sulfate groups embedding into the structure of guar gum was confirmed by elemental analysis and FTIR. The initial and sulfated guar gum were also characterized by methods: X-ray diffraction, scanning electron microscopy, and gel permeation chromatography. Using X-ray diffraction, it was shown that amorphization of guar gum occurs during sulfation. Using scanning electron microscopy, it was shown that the morphology of guar gum changes in the process of sulfation. Using gel permeation chromatography, it was shown in the process of guar gum sulfation by a complex of sulfur trioxide with 1,4-dioxane, the molecular weight decreases from 600 to 176 kDa. The geometric parameters of all complexes were carried out by using the DFT/B3PW91 method with a 6-31 + G (d,p) basis set. These structures are optimized to predict the important properties of a theme. MEP with contour map has been performed to obtain the electronic properties. Frontier molecular orbital HOMO-LUMO orbital diagram has been obtained for different energy levels and their band gap energies have been computed.
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Acknowledgments
The devices of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were used in the work. The authors are grateful to G.N. Bondarenko for obtaining X-ray data, Korolkova I.V. for obtaining FTIR spectra and Antonov A.V. for obtaining SEM images. Besides, the authors thank Bitlis Eren University for supporting the Gaussian 09W software and Bingol University for the server.
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This work was supported by the Ministry of Higher Education and Scientific Research of Tunisia. The publication also supported by RFBR, project № 20-33-70256.
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Conceptualization: Aleksandr S. Kazachenko, Feride Akman, Abir Sagaama, Noureddine Issaoui; methodology: Aleksandr S. Kazachenko, Feride Akman, Noureddine Issaoui; formal analysis and investigation: Feride Akman, Abir Sagaama, Noureddine Issaoui, Yuriy N. Malyar, Valentina S. Borovkova, Aleksandr S. Kazachenko; writing—original draft preparation: Noureddine Issaoui, Feride Akman, Abir Sagaama, Aleksandr S. Kazachenko; writing—review and editing: Aleksandr S. Kazachenko, Feride Akman, Abir Sagaama, Noureddine Issaoui; supervision: Feride Akman, Abir Sagaama, Noureddine Issaoui, Natalya Yu. Vasilieva.
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Kazachenko, A.S., Akman, F., Sagaama, A. et al. Theoretical and experimental study of guar gum sulfation. J Mol Model 27, 5 (2021). https://doi.org/10.1007/s00894-020-04645-5
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DOI: https://doi.org/10.1007/s00894-020-04645-5