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Type: Artigo de periódico
Title: Antibacterial Activity Of Essential Oils Against Strains Of Streptococcus And Staphylococcus [atividade Antibacteriana De óleos Essenciais Sobre Streptococcus Mutans E Staphylococcus Aureus]
Author: Freire I.C.M.
Perez A.L.A.L.
Cardoso A.M.R.
Mariz B.A.L.A.
Almeida L.F.D.
Cavalcanti Y.W.
Padilha W.W.N.
Abstract: The aim of this study is to evaluate the in vitro antimicrobial activity of essential oils of Ocimum basilicum (basil), Thymus vulgaris (thyme) and Cinnamomum cassia (Chinese cinnamon) against strains of Streptococcus mutans (ATCC 25175) and Staphylococcus aureus (ATCC 25923). The antibacterial activity of the essential oils was determined by Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC). The MIC was obtained by the microdilution technique using 96-well microplates, in which we inserted: 100μL of Brain Heart Infusion broth at double concentration, 100μL of the dilution of the essential oils and 10μL of bacterial suspension (1.5 × 106 organisms / mL). The products were diluted from the initial concentration of 8% up to 0.0625%. The MIC corresponded to the last dilution in which there was no presence of bacteria or turbidity in the culture medium. The MBC was obtained by seeding, in Mueller-Hinton agar, 10μL aliquots of dilutions corresponding to the MIC and the two immediately preceding ones (2MIC and 4MIC). The plates were incubated at 37°C in a bacteriological incubator for 24 hours. The tests were performed in triplicate, and 2% Chlorhexidine Digluconate was the control product. For S. aureus, the MIC and MBC of the essential oils of C. cassia, O. basilicum and T. vulgaris were 0.0625%, 0.0625% and 4%, respectively. For S. mutans, the MIC and MBC of the essential oils of C. cassia and T. vulgaris were 0.125% and 0.25%, respectively. The MIC of O. basilicum against S. mutans was 4% and the essential oil showed no bactericidal action. Chlorhexidine Digluconate presented antibacterial activity against all organisms. The evaluated essential oils presented antibacterial activity against the strains of S. mutans and S. aureus, and we highlight the essential oils from C. cassia and T. vulgaris with the lowest MIC and MBC.
Editor: Instituto de Biociencias
Rights: aberto
Identifier DOI: 10.1590/1983-084X/12_053
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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