Table 2.

Diameters of inhibition zones and minimum inhibitory concentration of different bacteria culture after 24 hours of treatment with Cinnamomum zeylanicum, Curcuma longa, or Origanum vulgare essential oil.

	Compounds	Bacteria strain
		Escherichia coli	Staphylococcus aureus	Pseudomonas aeruginosa
Inhibition zones (mm)	Cinnamomum zeylanicum	15.00 ± 1.000	14.67 ± 0.577	10.33 ± 0.577
	Curcuma longa	12.67 ± 0.577	15.33 ± 0.577	9.66 ± 0.577
	Origanum vulgare	14.67 ± 0.577	15.67 ± 0.577	12.00 ± 1.000
	gentamycin	14.33 ± 0.577	20.67 ± 0.577	16.67 ± 0.577
MIC (μg/mL)	Cinnamomum zeylanicum	133.3 ± 14.43	216.7 ± 28.87	550.0 ± 0.00
	Curcuma longa	216.7 ± 28.87	83.3 ± 14.43	383.3 ± 57.74
	Origanum vulgare	266.7 ± 28.87	166.7 ± 28.87	483.3 ± 28.87
	amoxicillin	16.0 ± 0.00	8.0 ± 0.00	n.d.
	gentamycin	n.d.	2.0 ± 0.00	n.d.
	polymyxin B	n.d.	n.d.	16.0 ± 0.00

To determine the inhibition zones, 75μL of each essential oil was used in the disk diffusion test. n.d.: not determined. Data represents mean ± standard deviation of experiment realized in triplicate.