Chemical Characterization and Antimicrobial Activity Evaluation of Natural Oil Nanostructured Emulsions.
The aim of this work was to investigate the antimicrobial activity of nanostructured emulsions based on copaiba (Copaifera langsdorffii) resin-oil, copaiba essential oil, and bullfrog (Rana catesbeiana Shaw) oil against fungi and bacteria related to skin diseases. Firstly, the essential oil was extracted from copaiba resin-oil and these oils, along with bullfrog oil, were characterized by gas chromatography combined with mass spectrometry (GC-MS). Secondly, nanostructured emulsion systems were produced and characterized. The antimicrobial susceptibility assay was performed, followed by the Minimum Inhibitory Concentration (MIC) determination, the bioautography assay, and the antibiofilm determination. Strains of the genera Staphylococcus, Pseudomonas, and Candida were used. The CG-MS analysis was able to identify the components of copaiba resin-oil, copaiba essential oil, and bullfrog oil. The MIC assay in association with the bioautography revealed that some esters of palmitic and oleic acids, a-curcumene, a-himachalene, isothujol, and α-fenchene--probably inhibited some strains. The nanostructured emulsions based on copaiba resin-oil and essential oil improved the antimicrobial activity of the pure oils, especially against Staphylococcus and Candida, resistant to azoles. The bullfrog oil nanostructured emulsion showed a lower antimicrobial effect when compared to the copaiba samples. However, bullfrog oil-based nanostructured emulsion showed a significant antibiofilm activity (p < 0.05). Given the significant antimicrobial and antibiofilm activities of the evaluated oils, it may be concluded that nanostructured emulsions based on copaiba and bullfrog oils are promising candidates for the treatment of infections and also may be used to incorporate other antimicrobial drugs.
Everton N
EN
Alencar
Francisco H
FH
Xavier-Júnior
Andreza R V
AR
Morais
Teresa R F
TR
Dantas
Nednaldo
N
Dantas-Santos
Lourena M
LM
Verissimo
Vera L G
VL
Rehder
Guilherme M
GM
Chaves
Anselmo G
AG
Oliveira
E Sócrates T
ES
Egitol
D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D018441:Biofilms / Q000187:drug effects; D001688:Biological Products / Q000737:chemistry* / Q000494:pharmacology*; D007887:Fabaceae / Q000737:chemistry; D005658:Fungi / Q000187:drug effects; D008401:Gas Chromatography-Mass Spectrometry; D008826:Microbial Sensitivity Tests; D049329:Nanostructures / Q000737:chemistry*; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D010938:Plant Oils; D011898:Ranidae
D000890:Anti-Infective Agents; D001688:Biological Products; D009822:Oils, Volatile; D010938:Plant Oils