The In Vitro Antimicrobial Effects of Lavandula angustifolia Essential Oil in Combination with Conventional Antimicrobial Agents

Table 1

The concentrations of essential oil and antimicrobial agent associated with the volume ratios studied.

	Volume ratio of essential oil : antimicrobial agent	Concentration of antimicrobial agent in combination	Concentration of essential oil in combination
	μL	μg/mL	mg/mL
1	90 : 10	0.25	7.2
2	80 : 20	0.50	6.4
3	70 : 30	0.75	5.6
4	60 : 40	1.00	4.8
5	50 : 50	1.25	4.0
6	40 : 60	1.50	3.2
7	30 : 70	1.75	2.4
8	20 : 80	2.00	1.6
9	10 : 90	2.25	0.8

to points on isobologram graphs.