Composition and Antimicrobial Activity of Euphrasia rostkoviana Hayne Essential Oil

Table 2

The inhibitory and cidal concentrations of E. rostkoviana essential oil.

Microorganism	Euphrasia rostkoviana EO					CIP	TIO
	MIC (µg/mL)		IC50 (µg/mL)		MBC/MFC (µg/mL)	MIC (µg/mL)	MIC (µg/mL)
	24 h	48 h	24 h	48 h	24 h	24 h	48 h
Enterococcus faecalis	512	—	128	—	1024	0.5	—
Staphylococcus aureus	512	—	128	—	>2048	0.5	—
Staphylococcus epidermidis	512	—	256	—	>2048	0.25	—
Klebsiella pneumoniae	2048	—	1024	—	>2048	0.125	—
Escherichia coli	2048	—	1024	—	>2048	0.015	—
Pseudomonas aeruginosa	>2048	—	>2048	—	>2048	0.125	—
Candida albicans	128	1024	128	1024	2048	—	0.063

The growth inhibition was measured after 24 h and 48 h of incubation in case of C. albicans; EO: essential oil; CIP: ciprofloxacin; TIO: tioconazole; MIC: minimum inhibitory concentration; IC50: inhibitory concentration causing ≥50% of bacterial growth; MBC: minimum bactericidal concentration; MFC: minimum fungicidal concentration.