Efeito antibacteriano do óleo de girassol ozonizado em diferentes concentrações

Abstract

The world is currently facing a crisis regarding microorganisms and microbial resistance. The evaluation of alternative antimicrobial therapies has been a constant search in recent decades. Ozonized oil can be an alternative within this field. The present study aims to analyze the antimicrobial efficacy of commercially available ozonated sunflower oil in different concentrations. A gram-positive bacteria Staphylococcus aureus and the gram-negative bacteria Escherichia coli were used. The microorganisms were grown in BHI broth (Brain and Heart Infusion) for 24h. Plates containing BHI agar were prepared for the inhibition halo test with a 3 mm diameter central well and contaminated with 50 µL of bacterial suspension. The wells made in the plates were filled with ozonated sunflower oil in concentrations ranging from 80 mmol-Eq / kg to 1290 mmol-Eq /. The plates were taken to the incubator at 37°C for 24h and the inhibition zone was measured with a millimeter probe, two control groups one with non-ozonated sunflower oil and one with 2% chlorhexidine gluconate solution were also evaluated. The results demonstrated that the efficacy for E.coli increases linearly with increasing concentration, however, only the concentrations of 702 mmol-Eq / kg and 1290 mmol-Eq / kg were significantly different (p<0.004). For S.aureus, the results showed significant differences only in the concentration of 1290 mmol-Eq / kg, but with a similar effect between the intermediate and higher concentrations (p<0.0001). The chlorhexidine group demonstrated to have a more effective action for both microorganisms under the conditions of this study (p<0.001). According to the results ozonized sunflower oil has less antimicrobial effect than chlorhexidine, the result is dependent on the concentration and only concentrations above 702 mmol-Eq / kg showed some efficacy.