Abstract
Fourteen microorganisms, including fungi, yeasts, and bacteria, were screened for their ability to metabolize the xanthine drug pentoxifylline. Thirteen cultures either reduced the drug to the alcohol metabolite or oxidatively cleaved the ketonic side chain to homologous carboxylic acid metabolites. The alcohol metabolite was the predominant or sole metabolite in all organisms, with conversions ranging from 6 to 91%. Preparative-scale production of the alcohol metabolite with Rhodotorula rubra (ATCC 20129) allowed for the isolation of this product with a 40% yield. Two organisms also produced the carboxylic acid metabolites at low levels (2 to 10%). The routes of metabolism in microbial cultures are the same as those reported in mammalian systems.
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