NEW METHODS OF PREPARATION OF ALLOBETULIN 3-O-FORMATE FROM BIRCH BARK AND STUDING ITS INFLUENCE ON BLOOD/PLAZMA COAGULATION
UDC 547.597:547.918
Abstract
The purpose of this work was to develop a new one-step method for the synthesis of allobetulin 3-O-formate from birch bark, select optimal synthesis conditions and to studing its influence on blood/plasma coagulation. A new one-step method has been proposed for the synthesis of allobetulin 3-O-formate from birch bark Betula Pendula Roth., based on combining the extraction of betulin, its isomerization into allobetulin in the presence of a catalyst - orthophosphoric acid, and the esterification of allobetulin with formic acid. The influence of the duration of the process of treating birch bark with formic acid and the H3PO4 content on the yield of allobetulin 3-O-formate was established. The highest yield of crude allobetulin 3-O-formate (37% by weight of a.d.b.) is achieved at a process duration of 12 hours in the presence of 10% H3PO4, as well as with a duration of 16 hours in the presence of 8% H3PO4. The yield of recrystallized from ethanol allobetulin 3-O-formate is about 30% by weight of the a.d.b. The composition of the obtained samples of recrystallized allobetulin 3-O-formate was determined by elemental analysis, and its structure was confirmed by IR and NMR spectroscopy.
In vitro experiments conducted using human donor blood showed that allobetulin 3-O-formate exhibits pronounced procoagulant properties and does not have a significant effect on the erythrocyte membrane. Allobetulin 3-O-formate can be used to create biomaterials with specified properties in relation to blood coagulation.
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