Antimicrobial cholic acid derivatives from the Pitch Lake bacteriumBacillus amyloliquefaciensUWI-W23

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Abstract

Six cholic acid derivatives (1–6) were isolated from broth cultures of Bacillus amyloliquefaciens UWI-W23, an isolate from the Trinidad Pitch Lake. The compounds were extracted via solvent extraction and/or XAD resin adsorption and purified using silica gel column chromatography. Their structures were elucidated using 1D, 2D NMR and ESI-MS spectrometry and FT-IR spectrophotometry. One of the compounds, taurodeoxycholate (2) is for the first time being reported from a bacterial source while deoxycholate (4) is for the first time being reported from a Gram-positive bacterium. The other compounds have not been previously isolated from Bacillus spp. viz. cholate (1), taurocholic acid (3); glycodeoxycholic acid (5) and glycocholic acid (6). All six compounds exhibited antimicrobial activity against P. aeruginosa and B. cereus with MICs ranging from 7 to 250μg/mL. Cholate (1) also showed activity against MRSA (MICs=125μg/mL) and glycocholic acid (6) against S. cerevisiae (MICs=15.6μg/mL).

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