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STUDIES ON THE STRUCTURAL MODIFICATIONS OF THE STEROIDS AND RELATED COMPOUNDS BY MICROORGANISMS

Sultan, Sadia (2004) STUDIES ON THE STRUCTURAL MODIFICATIONS OF THE STEROIDS AND RELATED COMPOUNDS BY MICROORGANISMS. PhD thesis, University of Karachi, Karachi.

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Abstract

The work embodied in this dissertation comprises on three parts. Part-A describes the microbial transformations of five bioactive steroids, i.e., mesterolone (70), 17a-ethynyl-17B-hydroxy-4-androsten-3-one (81), 17a-ethyl-17B-hydroxy-4-androsten-3-one (82), cortisol (8) and (+)-androst-4-ene-3, 17-dione (4). Part-B describes the biotransformation of a seaquiterpene cedryl acetate (100). Part-C describes the bioactivities of substrates 70, 81, 82, 8, 4 and 100 and their microbial and chemical derivatives. It is further divided into two parts. Part C-1 explains the inhibitory activities of microbial and chemical derivatives of starting materials 81, 82, 8, 4 and 100 against the enzymes tyrosinase, prolyl endopoptidase and a-glucosidase while Part-C-II deals with the anti-inflammatory activity of mesterolone (70) and its derivatives. Part_A: This part of the thesis is mainly concerned with the structural modification and characterization of steroids through microorganisms. The transformed products were either new or previously reported in the literature. They were characterized by various sophisticated spectroscopic techniques available at this institute Mesterolone (70), on incubation with cephalosporium aphidicola, Rhizopus stolonifer and Fusarium lini, afforded six new and three known metabolites namely methyl-5a-androstan-3, 17-dione (71), 3B, 17B-dihydroxy-1a-methyl-5a-androstane (72) 1a-methyl-androst-1-ene-3, 17-dionw (73). 15a-hydroxy-1a-methydroxy-1a-methyl-5a-androst-3-one (77), 11a, 17B-dihydroxy-1a-methyl-5a-androstan-3-one (78) 15a, 17B-dihyroxy-1a-methyl-5a-androstane-3-one (79) and 15a, 17B-dihydroxy-1a-methyl-androst-1-en-3-one (80)

Item Type:Thesis (PhD)
Uncontrolled Keywords:steroids, microorganisms, bioactive steroids, biotransformation, microbial transformations, bioactivities, inhibitory activities, anti-inflammatory activity
Subjects:Physical Sciences (f) > Chemistry(f2)
ID Code:1104
Deposited By:Mr. Muhammad Asif
Deposited On:20 Dec 2006
Last Modified:04 Oct 2007 21:04

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