Özet:

The aim of this study was to determine the antimicrobial activities of aerial parts extracts of some Bidens species against some bacteria and yeast. Aqueous and ethanolic aerial parts extracts of Bidens cernua L. var. radiata DC., B. frondosa L. and B. tripartita L. were screened for their antimicrobial activities against Staphylococcus aureus ATCC 25923, S. aureus ATCC 43300 methicillin-resistant S. aureus , Bacillus subtilis ATCC 6633, Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853 and Candida albicans ATCC 10231. Broth macrodilution method was used to determine the antimicrobial activities of plant extracts. Ethanolic extracts of tested species exhibited better antimicrobial activity than aqueous extracts. Ethanolic extracts of tested species possessed activity having MIC values of 0.125-0.250 mg/ ml against the tested microorganisms. No antibacterial activity was observed for all the aqueous extracts. Only aqueous extracts of B. frondosa and B. tripartita showed antifungal activity having MIC values of 0.500-1.000 mg/ml against C. albicans, respectively. It is conceivable that use of Bidens species for treatment of various skin diseases and injuries, and also cold in folk medicine is because of its antimicrobial activity. This is the first research on antimicrobial activity of Turkish Bidens species.

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