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In the present study,  Salvia fruticosa  and  Salvia aramiensis  essential oils’ chemical composition was compared, and their  in vitro  antimicrobial activity was tested against  Escherichia coli ,  Klebsiella pneumoniae ,  Bacillus subtilis, Staphylococcus aureus ,  Candida albicans  and  Candida parapsilosis . The major compounds of  S. fruticosa  oil were eucalyptol (29.04%) and camphor (21.32%). Major components of  S. aramiensis  essential oil were eucalyptol (59.51%) and  β -pinene (20.03%). The antimicrobial activities of essential oils were investigated by using disc diffusion and spectrophotometric broth micro-dilution methods. The highest inhibition zone diameter of  S. aramiensis  was found at 10.2 mm against  C. albicans  while the low inhibition zones (IZ) were on  E. coli  and  B. subtilis  (0.1 mm). Whereas the highest IZs of  S. fruticosa  was 8.38 for  C. parapsilosis , the lowest IZs were 0.1 mm for  E. coli ,  K. pneumoniae  and  B. subtilis  by disc diffusion method (P˂0.05). The Minimum Inhibitory Concentration (MIC) of  S. aramiensis  and  S. fruticosa  EOs ranged from 56.2 to 146 μg/mL for all pathogens (P˂0.05). As a result, the antimicrobial efficacy of  S. aramiensis  on  S. aureus  and  C. parapsilosis  was demonstrated for the first time in this study, furthermore, both essential oils were found to be more effective against studied fungi rather than bacteria.

Comparison of Chemical Composition and Antimicrobial Activity of Salvia fruticosa Mill. and S. aramiensis Rech. Fill. (Lamiaceae)