Bioassay-guided fractionation and antimicrobial and cytotoxic activities of Cassia bakeriana extracts

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• 作者：Luí ; s C.S. Cunha^a ; Sé ; rgio A.L. de Morais^a ; Francisco J.T. de Aquino^a ; Roberto Chang^a ; Alberto de Oliveira^a ; Má ; rio M. Martins^a ; Carlos H.G. Martins^b ; Laí ; s C.F. Sousa^a ; Tricya T. Barros^a ; Clá ; udio V. da Silva^c ; Evandro A. do Nascimento^a ; ^{eanascimento@ufu.br}
• 关键词：Antimicrobial activity ; Cassia bakeriana ; Cassic acid ; Cytotoxicity ; 1 ; 8-Dihydroxy-anthraquinone-3-carboxylic acid ; Rhein
• 刊名：Revista Brasileira de Farmacognosia
• 出版年：2017
• 出版时间：January-February 2017
• 年：2017
• 卷：27
• 期：1
• 页码：91-98
• 全文大小：608 K
• 卷排序：27

文摘

The antimicrobial potential of extracts of bark and leaves of Cassia bakeriana Craib, Fabaceae, against aerobic and anaerobic oral bacteria was evaluated by the microdilution broth method. For crude ethanol extracts and organic fractions tested, the bark dichloromethane phase showed a significant antibacterial effect, with MIC values ranging from 12.5 to 100 μg/ml for most of the microorganisms tested. Thus, a bioassay-guided fractionation of this fraction was performed. This fractionation led to isolation of the 1,8-dihydroxy-anthraquinone-3-carboxylic acid, also known as cassic acid or rhein. It is the first time that this bioactive anthraquinone has been isolated from this plant. Rhein exhibited good selectivity and high activity against anaerobic microorganisms, with MIC values ranging between 3.12 μg/ml (11.0 μM) and 25 μg/ml (88.0 μM). These results were considered very promising since the most active samples and rhein showed greater selectivity against oral microorganisms than toxicity to Vero cells.