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Microbial bioconversion studies conducted on the diterpene psiadin have revealed that it was metabolized by Aspergillus niger (NRRL 2295) to give 2alpha-hydroxydeoxopsiadin, Cunninghamella blakesleeana (ATCC 8688a) to give 11beta-hydroxypsiadin, and Cylindrocephalum aureum (ATCC 12720), Gongronella butleri (ATCC 22822), Kloeckera africana (ATCC 20111), and Kluyveromyces marxianus var. lactis (ATCC 2628) to yield 7alpha-hydroxypsiadin. Their structures have been established on the basis of spectral data. The structure and relative stereochemistry of 7alpha-hydroxypsiadin was confirmed by single-crystal X-ray analysis.


K Y Orabi, A M Galal, A R Ibrahim, F S El-Feraly, A T McPhail. Microbial hydroxylation and reduction of the diterpene psiadin. Zeitschrift für Naturforschung. C, Journal of biosciences. 2001 Mar-Apr;56(3-4):216-22

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PMID: 11371011

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