Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study
2021
Zdravković, Nemanja | Radanović, Oliver | Ninković, Milan | Savić Radovanović, Radoslava | Rajić Savić, Nataša | Marjanović, Đorđe | Bojkovski, Jovan | Škrbić, Zdenka
Antimicrobial therapy is important tool in fighting infectious diseases. The significance of the role of antimicrobials in nature remains vastly uninvestigated. Plants produce secondary metabolites for, among other functions, natural protection against microbial infection. The aim of this research was to investigate antimicrobial effects of 5 different essential oils and 5 main constituents of plant essential oils toward some of the common veterinary microbial pathogens. Plant etheric oils (EO) of oregano (Origanum vulgare L.), black caraway (Nigella sativa L.), sandalwood (Santalum album L.), peppermint (Mentha balsamea Wild.) and eucalyptus (Eucalyptus obliqua L'Hér.) and active components of etheric oils: D-limonene, D-α pinene, thymol, carvacrol and cynamaldehyde were tested for antimicriobial activity against referent strains of: Staphylococcus aureus, Methicilin resistant S. aureus (MRSA), Escherichia coli; as well as against clinical isolates of: Staphylococcus pseudintermedius, E. coli, Pseudomonas aeruginosaand yeast Candida sp. For each etheric oil and active compound minimal inhibitory concentrations (MIC) are observed by method of broth microdilution. Results of these investigations have shown that active components of the EO have stronger antimicrobial effect than complete formulation of essential oils used in the study. Among tested EOs the most potent was the peppermint etheric oil, while carvacrol showed the strongest antimicrobial effect among active components of EO. Interesting finding is that there was almost no difference among MICs between referent S. aureus and MRSA.
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