157-162
Antimicrobial Activity of the Istranca Oak (Quercus hartwissiana Steven) against Nosocomial Pathogens
Authors: Adem Akkuş, Emel Çalışkan, Özge Kılınçel, Görkem Dülger
Number of views: 417
Aim: This study aimed to investigate the antimicrobial activity of extracts from the Istranca oak (Quercus hartwissiana Steven) against bacterial and fungal pathogens. Materials and Methods: Extraction of the Istranca oak was carried out with ethanol, formaldehyde, acetone, ethyl acetate, and methanol solvents. After injecting 50 μl of these extracts into sterile discs, the discs were dried in a sterile environment for 24 hours in order for the results not to be affected by the solvents present in the extracts. Antimicrobial activity against the species Pseudomonas aeruginosa, Acinetobacter baumannii, Escherichia coli, Klebsiella pneumoniae, Salmonella spp., methicillin-resistant Staphylococcus aureus, methicillin-susceptible Staphylococcus aureus, Staphylococcus epidermidis, Enterococcus spp., Candida albicans, Candida glabrata and Candida tropicalis was investigated by disc diffusion method. Results: It was observed that the extract prepared with ethanol showed the widest zone diameter against Enterococcus spp. (8mm) and S. epidermidis (8mm), the extracts with formaldehyde and ethyl acetate against E. coli (16mm, 28mm), the extract with acetone against Enterococcus spp. (21mm), and the extract with methanol against methicillin-susceptible S. aureus (28mm). For the yeasts, the extract prepared with ethanol showed the widest zone diameter against C. glabrata (12mm), the extract with formaldehyde against C. albicans (28mm) and C. tropicalis (28mm), and the extracts prepared with acetone, ethyl acetate, and methanol against C. albicans (19mm, 30mm, 22mm). Discussion and Conclusion: It was determined that the extract prepared with ethyl acetate showed wider zone diameter against the strains studied, compared to extracts prepared with the other solvents. Given that the widest zone diameters were observed against the strains E. coli, S. aureus and C. albicans, we think that it is important to conduct in vivo antimicrobial studies on the inhibitory effects of the Istranca oak indigenous to our country.