Current Microbiology

, Volume 39, Issue 6, pp 309–312

Bioconversion of Progesterone by the Activated Immobilized Conidia of Aspergillus ochraceus TS


  • Tapan K.  Dutta
    • Marine Biology Institute, 3-75-1 Heita, Kamaishi City, Iwate 026, Japan
  • Timir B.  Samanta
    • Department of Microbiology, Bose Institute, P-1/12, C I T Scheme VIIM, Calcutta 700 054, India

DOI: 10.1007/s002849900464

Cite this article as:
Dutta, T. & Samanta, T. Curr Microbiol (1999) 39: 309. doi:10.1007/s002849900464


Progesterone was transformed to its 11α-hydroxy derivative (100% e.e) by the activated immobilized conidia of Aspergillus ochraceus TS. The immobilized preparation retained 79% of free conidial activity. The immobilized conidia, activated by nutrients, exhibited an increase in 11α-hydroxylation, and it was free of the side product 6β, 11α-dihydroxy progesterone. The half life and turnover of immobilized and activated immobilized conidia were 14 and 12 days and 187 and 416 μmoles of the product/g of conidia respectively. The pH and temperature profiles of the free conidia remained unaltered after immobilization and activation. Some germination of conidia inside the matrix owing to incubation with nutrients was detected by scanning electron microscopy.

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© Springer-Verlag New York Inc. 1999