SYNTHESIS OF COCRYSTALS OF BETULIN WITH SUBERIC ACID AND STUDY OF THEIR PROPERTIES
UDC 54.05+547.91
Abstract
Lupane triterpenoids, betulin and its derivatives, are attracting great interest due to their wide range of biological and pharmacological activities. However, the poor solubility of betulin and its derivatives in aqueous media significantly reduces their bioavailability. Obtaining cocrystals, that is, multicomponent crystal systems containing active pharmaceutical ingredients and non-toxic partner molecules in their structure, is used in pharmacy to change the physicochemical properties of drugs, including the rate of dissolution and solubility. In this study, cocrystals of betulin with suberic acid were obtained by liquid-assisted grinding method using organic solvents of different polarity: ethanol, acetone, ethyl acetate, chloroform, toluene, dioxane. The formation of cocrystals was confirmed by X-ray diffraction analysis, IR spectroscopy, and thermal analysis. It has been shown that cocrystals of betulin with suberic acid contain water molecules in their structure; anhydrous cocrystals can be obtained by heating a physical mixture of reagents until the acid melts. The results of experiments on the dissolution of cocrystals of betulin with suberic acid in comparison with the data for cocrystals of betulin with adipic acid showed that an increase in the length of the aliphatic acid chain leads to a decrease in the rate of betulin release into solution.
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