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Article
Structure and thermochemical properties of copper-containing birch xylan sulfates obtained by the ion exchange method
For the first time, the synthesis of water-soluble copper-containing xylan sulfates (Cu-XS) was carried out by ion exchange method. The composition and structure of the obtained polymers were studied by chemic...
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Article
Isolation of Dihydroquercetin and Arabinogalactan from Larch Wood by Water-Ethanol Solutions
Siberian larch wood (Larix sibirica Lebed.) contains such valuable biologically active substances as dihydroquercetin (DHQ) and arabinogalactan (AG), promising for the use in the pharmaceutical and food industrie...
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Article
Esterification of Betulin 3-Acetate in Melts of Some Organic Acids
Synthetic methods for betulin 3-acetate-28-benzoate, betulin 3-acetate-28-p-bromobenzoate, betulin 3-acetate-28-cinnamate, betulin 3-acetate-28-succinate, and betulin 3-caetate-28-phthalate based on the reacti...
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Article
Sulfation of arabinogalactan with sulfamic acid under homogeneous conditions in dimethylsulfoxide medium
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...
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Article
Synthesis of Betulin Bromobenzoate, Dicinnamate, and Disuccinate in Melts of the Corresponding Acids
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Article
Sulfation of Xylan with Sulfamic Acid in N,N-Dimethylformamide
Sulfation of birch wood xylan by sulfamic acid in N,N-dimethylformamide (DMF) in the presence of urea was studied for the first time. The effect of the duration of sulfation of xylan with a mixture of sulfamic ac...
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Article
Synthesis and Study of Copper-Containing Polymers of Microcrystalline Cellulose Sulfates from Larch Wood
For the first time, the synthesis of water-soluble copper-containing microcrystalline cellulose sulfates (Сu-MCS) has been performed by the ion exchange method. The composition of the products has been studied...
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Article
Synthesis and Study of Copper-Containing Polymers Based on Sulfated Arabinogalactan
Synthesis of water-soluble copper-containing sulfates of arabinogalactan was carried out for the first time by the ion exchange method. Their composition and structure were studied by the methods of elemental ...
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Article
The Raman Spectroscopy, XRD, SEM, and AFM Study of Arabinogalactan Sulfates Obtained Using Sulfamic Acid
The structure of sodium salts of arabinogalactan (AG) sulfates obtained by sulfating AG of larch wood with a sulfamic acid–urea mixture in 1,4-dioxane was studied by the methods of Raman spectroscopy, X-ray di...
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Article
Study of cellulose sulfates by X-ray photoelectron spectroscopy
Samples of microcrystalline cellulose (MCC) have been studied by X-ray photoelectron spectroscopy before and after sulfation. It has been found that the reaction of MCC with chlorosulfonic acid in dioxane resu...
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Article
Sulfation of arabinogalactan by sulfamic acid in dioxane
The sulfation of arabinogalactan (AG) by sulfamic acid in the presence of urea in dioxane has been studied. The degree of AG sulfation increases as the sulfation temperature increases from 70 to 95°C. As indic...
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Article
Sulfation of betulin with chlorosulfonic acid in dimethylformamide and dioxane
The reaction of sulfation of betulin with chlorosulfonic acid in dioxane or dimethylformamide was found to proceed in homogeneous medium at 40–60°C. It was shown that the esterification of betulin to betulin 3...
