RT Journal Article SR Electronic A1 Sleha, Radek A1 Mosio, Petra A1 Vydrzalova, Marketa A1 Jantovska, Alexandra A1 Bostikova, Vanda A1 Mazurova, Jaroslava T1 In vitro antimicrobial activities of cinnamon bark oil, anethole, carvacrol, eugenol and guaiazulene against Mycoplasma hominis clinical isolates JF Biomedical papers YR 2014 VO 158 IS 2 SP 208 OP 211 DO 10.5507/bp.2012.083 UL https://biomed.papers.upol.cz/artkey/bio-201402-0008.php AB Aims: The aim of this study was to evaluate the antimicrobial effects of five natural substances against 50 clinical isolates of Mycoplasma hominis. Methods and Results: The in vitro activity of selected natural compounds, cinnamon bark oil, anethole, carvacrol, eugenol and guaiazulene, was investigated against 50 M. hominis isolates cultivated from cervical swabs by the broth dilution method. All showed valuable antimicrobial activity against the tested isolates. Oil from the bark of Cinnamomum zeylanicum (MBC<sub>90</sub> = 500 µg/mL) however was found to be the most effective. Carvacrol (MBC<sub>90</sub> = 600 µg/mL) and eugenol (MBC<sub>90</sub> = 1000 µg/mL) also possessed strong antimycoplasmal activity. Conclusions: The results indicate that cinnamon bark oil, carvacrol and eugenol have strong antimycoplasmal activity and the potential for use as antimicrobial agents in the treatment of mycoplasmal infections.