A new pentacyclic triterpene with potent antibacterial activity from Limnophila indica Linn. (Druce)

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• 作者：Goutam Brahmachari ; Narayan C. M ; al ; Rajiv Roy ; Ranjan Ghosh ; Soma Barman ; Sajal Sarkar ; Shyamal K. Jash ; Sadhan Mondal
• 关键词：CC ; column chromatography ; CFU ; colony forming units ; CLSI ; Clinical and Laboratory Standards Institute ; DMSO ; dimethyl sulphoxide ; GCMS ; gas chromatographic mass spectrophotometer ; MIC ; minimum inhibitory concentration ; MTCC ; microbial type culture colle
• 刊名：Fitoterapia
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：90
• 期：Complete
• 页码：104-111
• 全文大小：666 K

文摘

A new pentacyclic triterpenoid constituent, characterized as 3-oxo-olean-12(13),18(19)-dien-29¦Á-carboxylic acid (1) on the basis of detailed spectral studies, was isolated from the aerial parts and roots of Limnophila indica (Scrophulariaceae). Compound 1 exhibited considerable antibacterial activity against three Gram-positive bacteria viz. Bacillus subtilis, Staphylococcus aureus and Listeria monocytogenes (MICs within a range of 25-30 ¦Ìg/ml) and moderate activity against four Gram-negative bacteria Salmonella typhimurium, Escherichia coli, Pseudomonas aeruginosa, and Pantoea ananatis (MICs within a range of 30-100 ¦Ìg/ml). The plant pathogenic bacterium P. ananatis and human pathogenic S. typhimurium responded at comparatively higher concentrations of the compound 1, which were 75 and 100 ¦Ìg/ml respectively. The compound inhibited the growth of Gram-positive B. subtilis and Gram-negative P. aeruginosa completely with a clear bactericidal mode of action at their MIC values. The compound upon treatment on both B. subtilis and P. aeruginosa released substantial amount of nucleic acid in the external medium and also effected the change of morphology towards pleomorphicity, thereby indicating its probable action on cell membrane. Furthermore, the triterpenoid 1 was found not to inhibit a probiotic lactic acid bacterium Lactococcus lactis subsp. lactis LABW4 under in vitro condition and to possess no toxicity in Swiss albino mice.