Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
The genus Russula is rich in colourless, yellow and red pteridine derivatives. The main dyestuffs of the pileus of the red species (R. emetica, badia, sardonia, obscura, paludosa) are recognized as glycosides of dimeric pteridine derivatives. The main component is a D-riboside. It has been named Russupteridin-sIII. The chromophore is very similar to that of rhodopterine (pterorhodine; I).Rhodopterine has been cleaved by aqueous ammonia to give xanthopterine and 7-methyl-xanthopterine, respectively.The new technique of isoelectric focusing using a pH and sucrose gradient   effectively separated pterines and Russula-dyestuffs. Preparative separation was achieved by means of a sephadex G25 chromatographic column using pyridine-water as a eluant.
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