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Molecules 2015, 20(5), 8440-8452; doi:10.3390/molecules20058440

Assessing the Chemical Composition and Antimicrobial Activity of Essential Oils from Brazilian Plants—Eremanthus erythropappus (Asteraceae), Plectrantuns barbatus, and P. amboinicus (Lamiaceae)

1
Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, 09972-270 Diadema, SP, Brazil
2
Instituto de Química, Universidade Federal de Alfenas, 37130-000 Alfenas, MG, Brazil
3
Departamento de Química, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil
4
Instituto Plantarum de Estudos da Flora. Av. Brasil, 2000, 13460-000 Nova Odessa, SP, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Peter J. Rutledge
Received: 20 March 2015 / Revised: 22 April 2015 / Accepted: 5 May 2015 / Published: 11 May 2015
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Abstract

The chemical composition and antimicrobial activity of essential oils obtained from three Brazilian plant species—leaves and branches of Eremanthus erythropappus (Asteraceae), leaves of Plectranthus barbatus, and leaves of P. amboinicus (Lamiaceae)—were determined. Analysis by GC/MS and determination of Kovats indexes both indicated δ-elemene (leaves—42.61% and branches—23.41%) as well as (−)-α-bisabolol (leaves—24.80% and stem bark—66.16%) as major constituents of E. erythropappus essential oils. The main components of leaves of P. barbatus were identified as (Z)-caryophyllene (17.98%), germacrene D (17.35%), and viridiflorol (14.13%); whereas those of leaves of P. amboinicus were characterized as p-cymene (12.01%), γ-terpinene (14.74%), carvacrol (37.70%), and (Z)-caryophyllene (14.07%). The antimicrobial activity against yeasts and bacteria was assessed in broth microdilution assays to determine the minimum inhibitory concentration (MIC) necessary to inhibit microbial growth. In addition, the crude oil of branches of E. erythropappus was subjected to chromatographic separation procedures to afford purified (−)-α-bisabolol. This compound displayed biological activity against pathogenic yeasts, thus suggesting that the antimicrobial effect observed with crude oils of E. erythropappus leaves and branches may be related to the occurrence of (−)-α-bisabolol as their main component. Our results showed that crude oils of Brazilian plants, specifically E. erythropappus, P. barbatus, and P. amboinicus and its components, could be used as a tool for the developing novel and more efficacious antimicrobial agents. View Full-Text
Keywords: Eremanthus erythropappus; Plectranthus barbatus; Plectranthus amboinicus; essential oils; chemical composition; antimicrobial activity Eremanthus erythropappus; Plectranthus barbatus; Plectranthus amboinicus; essential oils; chemical composition; antimicrobial activity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Santos, N.O.; Mariane, B.; Lago, J.H.G.; Sartorelli, P.; Rosa, W.; Soares, M.G.; da Silva, A.M.; Lorenzi, H.; Vallim, M.A.; Pascon, R.C. Assessing the Chemical Composition and Antimicrobial Activity of Essential Oils from Brazilian Plants—Eremanthus erythropappus (Asteraceae), Plectrantuns barbatus, and P. amboinicus (Lamiaceae). Molecules 2015, 20, 8440-8452.

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