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Monteiro EDS, da Silva FS, Gomes KO, do Prado BA, dos Santos RD, Gomes da Camara CA, de Moraes MM, da Silva ICR, de Macêdo VT, Gelfuso GM, de Sá Barreto LCL, Orsi DC. Characterization and Determination of the Antibacterial Activity of Baccharis dracunculifolia Essential-Oil Nanoemulsions. Antibiotics (Basel) 2023; 12:1677. [PMID: 38136711 PMCID: PMC10740613 DOI: 10.3390/antibiotics12121677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/19/2023] [Accepted: 11/22/2023] [Indexed: 12/24/2023] Open
Abstract
The aim of this study was to evaluate the antibacterial activity of nanoemulsions of Baccharis dracunculifolia essential oil. The volatile compounds of the essential oil were identified using gas chromatography-mass spectrometry. The properties of the nanoemulsions (droplet size, polydispersity index, pH, and electrical conductivity) were determined. The antibacterial activities of the essential oil and its nanoemulsions were evaluated using MIC, MBC, and disk diffusion. The microorganisms used were: Gram-positive bacteria (Staphylococcus aureus ATCC 25923, Bacillus cereus ATCC 14579, Streptococcus mutans ATCC 25175, and Enterococcus faecalis ATCC 29212) and Gram-negative bacteria (Pseudomonas aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC BAA-1706, Salmonella enterica ATCC 14028, and Escherichia coli ATCC 25922). The major volatile compounds of the B. dracunculifolia essential oil were limonene (19.36%), (E)-nerolidol (12.75%), bicyclogermacrene (10.76%), and β-pinene (9.60%). The nanoemulsions had a mean droplet size between 13.14 and 56.84 nm. The nanoemulsions presented lower and statistically significant MIC values compared to the essential oil, indicating enhancement of the bacteriostatic action. The disk diffusion method showed that both the nanoemulsions and the essential oil presented inhibition zones only for Gram-positive bacteria, while there were no results against Gram-negative bacteria, indicating that B. dracunculifolia essential oil has a better antimicrobial effect on Gram-positive microorganisms.
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Affiliation(s)
- Erika da Silva Monteiro
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | - Franklyn Santos da Silva
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | - Karolina Oliveira Gomes
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | - Bruno Alcântara do Prado
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | - Rebeca Dias dos Santos
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | | | - Marcilio Martins de Moraes
- Department of Chemistry, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (C.A.G.d.C.); (M.M.d.M.)
| | - Izabel Cristina Rodrigues da Silva
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | - Vinicius Teixeira de Macêdo
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
| | - Guilherme Martins Gelfuso
- Laboratory of Food, Drugs, and Cosmetics, University of Brasília, Brasília 70910-900, DF, Brazil; (G.M.G.); (L.C.L.d.S.B.)
| | | | - Daniela Castilho Orsi
- Laboratory of Quality Control, University of Brasília, Brasília 72220-900, DF, Brazil; (E.d.S.M.); (F.S.d.S.); (K.O.G.); (B.A.d.P.); (R.D.d.S.); (I.C.R.d.S.); (V.T.d.M.)
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