title: Identification, isolation and optimization of antifungal metabolites from the Streptomyces Malachitofuscus ctf9.
abstract: An indigenous Streptomyces isolate CTF9, exhibiting promising antifungal activity against Mucor miehei and Candida albicans in pre-screening studies, was investigated by cultivation in a 50-L fermenter and by subsequent isolation, purification, and structure elucidation of the active metabolites. Based on the morphological, biochemical, and physiological characterization, as well as the 16S rRNA gene sequence, the isolate CTF9 was identified as Streptomyces malachitofuscus. Using a series of chromatographic techniques, two pure compounds were isolated from the obtained extracts after the fermentation of the isolate CTF9. The isolated compounds were identified as phenylacetic acid and indolyl-3-lactic acid by mass spectrometry (MS) and NMR analysis. The culture optimization studies revealed that the isolate CTF9 can use a variety of low-cost carbon and nitrogen sources to generate the maximum quantity of industrially important metabolites at an elevated temperature of 35°C and at a pH 7.8.
authors.affiliation: Department of Microbiology and Molecular Genetics, University of the Punjab, Quaid-e-Azam Campus , Lahore 54590 , Pakistan ; Institute of Organic and Biomolecular Chemistry, University of Göttingen , Tammannstrasse 2, D-37077 , Göttingen.
authors.forename: Imran
authors.initials: I
authors.lastname: Sajid
authors.forename: Khaled A
authors.initials: KA
authors.lastname: Shaaban
authors.forename: Shahida
authors.initials: S
authors.lastname: Hasnain
keywords: Indolyl-3-lactic acid; Phenylacetic acid; indigenous Streptomyces sp. CTF9
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