Rehman, Shakil and Khan, Reehana and Bhat, Khursheed A. and Raja, Alsaba F. and Shawl, Abdul S. and Alam, Mohd S. (2010) Isolation, characterisation and antibacterial activity studies of coumarins from Rhododendron lepidotum Wall. ex G. Don, Ericaceae. Revista Brasileira de Farmacognosia, 20 (6). pp. 886-890. ISSN 0102-695X

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RESUMO: “Estudos de isolamento, caracterização e atividade antibacteriana de cumarinas de Rhododendron lepidotum Wall. ex G. Don, Ericaceae”. Seis cumarinas dafinina (1), dafinetina (2), dafinetina glicosídeo (3), rodonetina (4), rodonina (5) eumbeliferona (6) foram isoladas do extrato metanólico das partes aéreas de Rhododendron lepidotum Wall. ex G. Don, Ericaceae. Os compostos e seus derivados acetilados foram testados para verificar sua atividade antibacteriana contra Staphylococcus aureus ATCC-29213, Escherichia coli resistente à meticilina, Staphylococcus aureus ATCC-15187, ATCC-8739,Pseudomonas aeruginosa ATCC-9027, pelo método de microdiluição, usando ciprofloxacina como referência. A substância 2 apresentou a melhor atividade antibacteriana com o MIC 125 μg/mL contra S. aureus ATCC-29213 e MRSA ATCC-15187 seguido pela substância 4, que apresentou o valor de CIM de 250 μg/mL contra as quatro cepas testadas. Todas as moléculas apresentaram melhor atividade antibacteriana do que seus derivados acetilados. Unitermos: Rhododendron lepidotum, glicosídeos cumarínicos, HMBC, antibacteriano, daphnin, daphnetin. ABSTRACT: Six coumarins daphnin (1), daphnetin (2), daphnetin glucoside (3), rhodonetin (4), rhodonin (5) and umbelliferone (6) were isolated from the methanolic extract of Rhododendron lepidotum Wall. ex G. Don, Ericaceae (aerial part). The compounds and their acetyl derivatives were screened for antibacterial activity against Staphylococcus aureus ATCC-29213, methicillin resistant Staphylococcus aureus ATCC-15187, Escherichia coli ATCC-8739, Pseudomonas aeruginosa ATCC-9027 by microdilution method as compared to the reference ciprofloxacin. Compound 2 displayed the best antibacterial activity with MIC 125 μg/mL against S. aureus ATCC-29213 and MRSA ATCC-15187 followed by 4 which exhibited the MIC value of 250 μg/mL against all the four tested strains. All molecules showed better antibacterial activity than their acyl derivatives.

Item Type: Article
Subjects: Biological Sciences
Depositing User: Mr. Amit Nargotra
Date Deposited: 27 Dec 2011 11:50
Last Modified: 27 Dec 2011 11:50

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