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  • Title: Biotransformation of the diperpenoid, isosteviol, by Aspergillus niger, Penicillium chrysogenum and Rhizopus arrhizus.
    Author: de Oliveira BH, dos Santos MC, Leal PC.
    Journal: Phytochemistry; 1999 Jul; 51(6):737-41. PubMed ID: 10389273.
    Abstract:
    The biotransformation of isosteviol (ent-16-ketobeyeran-19-oic acid) by three fungi is described. Aspergillus niger produced the 7 beta-OH derivative, ent-7 alpha-hydroxy-16-ketobeyeran-19-oic, and the 1 alpha, 7 beta-diOH derivative, ent-1 beta, 7 alpha-dihydroxy-16-ketobeyeran-19-oic acid. The 17-OH compound, ent-17-hydroxy-16-ketobeyeran-19-oic acid, was obtained with Penicillium chrysogenum. Rhizopus arrhizus produced the 7 beta-OH derivative, ent-7 alpha-hydroxy-16-ketobeyeran-19-oic acid. The isolated metabolites were characterised by IR, NMR and MS.
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