Abstract: The chemical composition of the essential oil obtained from the leaves of Piper ovatum Vahl by hydrodistillation was analyzed by GC–MS. The main constituents found were δ-amorphene (16.5 %), cis-muurola-4(14),5-diene (14.29 %) and γ-muurolene (13.26%). The crude extracts and isolated compounds were screened for their antimicrobial activity. Hydroalcoholic extracts of different parts of Piper ovatum Vahl, essential oil and amides isolated from leaves were tested against Gram-positive and Gram-negative bacteria and Candida species. All extracts and amides were active against Bacillus subtilis and Candida tropicalis, including clinical strains. Essential oil was active against C. tropicalis. These amides showed an inhibitory effect on the adherence of C. tropicalis ATCC 28707 on cover glasses at 10 μg/mL, but did not show morphological alterations at the tested concentrations. Amides were identified as piperovatine and piperlonguminine, and showed MIC values of 15.6 and 31.2 μg/mL to B. subtilis and 3.9 μg/mL to C. tropicalis, and low toxic effects to Vero cells and macrophages.
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Silva, D.R.; Endo, E.H.; Filho, B.P.D.; Nakamura, C.V.; Svidzinski, T.I.E.; De Souza, A.; Young, M.C.M.; Ueda-Nakamura, T.; Cortez, D.A.G. Chemical Composition and Antimicrobial Properties of Piper ovatum Vahl. Molecules 2009, 14, 1171-1182.
Silva DR, Endo EH, Filho BPD, Nakamura CV, Svidzinski TIE, De Souza A, Young MCM, Ueda-Nakamura T, Cortez DAG. Chemical Composition and Antimicrobial Properties of Piper ovatum Vahl. Molecules. 2009; 14(3):1171-1182.
Silva, Daniel Rodrigues; Endo, Eliana Harue; Filho, Benedito Prado Dias; Nakamura, Celso Vataru; Svidzinski, Terezinha Inez Estivaleti; De Souza, Amanda; Young, Maria Claudia M.; Ueda-Nakamura, Tânia; Cortez, Diógenes Aparício Garcia. 2009. "Chemical Composition and Antimicrobial Properties of Piper ovatum Vahl." Molecules 14, no. 3: 1171-1182.