Polybuffer separation of the combined alkaloids of Peganum harmala

Chemistry of Natural Compounds
1976.0

Abstract

The mother solution from the combined alkaloids of Peganum harmala (the plant was collected in May, 1973 in the building stage), after the isolation of the peganine and deoxypeganine [1, 2] was separated according to basicities on an apparatus for automatic liquid extraction [3] between buffer solutions of various pH values and chloroform. The chloroform mother solution (4 liters) contained 400 g of combined alkaloids. The solution of the combined alkaloids, and also the washing chloroform, was passed through the column of the apparatus at the rate of 1000-1200 ml/h, and then the buffer solutions were washed with pure chloroform. Each buffer solution was decanted off separately and made alkaline with concentrated ammonia to pH 8-9, and the alkaloids were extracted with chloroform. Then the chloroform was evaporated to dryness. The fractions of alkaloids obtained in this way were analyzed to TLC [nonfixed alumina; chloroform-methanol-benzene (5:1:4)], and the fractions with identical chromatograms were combined. The alkaloids were isolated according to their solubilities, by recrystallization, by the preparation of salts, by precipitation, etc. [2]. Thus, the total alkaloids of Peganum harmala contain strongly basic (pH of the extracting buffer 6.5-7.0), moderately basic (pH 3-6.5), and weakly basic (pH 2 and 10% H2SO4) alkaloids, additional amounts of which can be obtained by using polybuffer separation.

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