Table 6.

Total antioxidant status (TAS) in HaCaT cells exposed to essential oils for 24 h.

Essential Oil	Dose (% w/v)	TAS (mmol/prot)
Control (−)	-	0.54 ± 0.04
Control (+)	-	4.32 ± 0.08
Lemongrass	8 × 10−3	0.56 ± 0.07
	4 × 10−3	0.71 ± 0.07 **
	2 × 10−3	0.73 ± 0.03 **
Clove	8 × 10−3	0.74 ± 0.12**
	4 × 10−3	1.03 ± 0.08 **
	2 × 10−3	1.45 ± 0.06 **
Oregano	8 × 10−3	1.53 ± 0.08 **
	4 × 10−3	2.07 ± 0.13 ***
	2 × 10−3	2.20 ± 0.16 ***
Melaleuca	6.4 × 10−2	0.78 ± 0.12 **
	3.2 × 10−2	1.19 ± 0.06 ***
	1.6 × 10−2	1.51 ± 0.28 **
Cassia	8 × 10−3	1.47 ± 0.11 **
	4 × 10−3	2.01 ± 0.14 ***
	2 × 10−3	2.72 ± 0.09 ***
Arborvitae	4 × 10−3	0.42 ± 0.08
	2 × 10−3	0.91 ± 0.13 **
	1 × 10−3	1.01 ± 0.08 **
Lavender	8 × 10−3	0.61 ± 0.05 *
	4 × 10−3	0.65 ± 0.09 *
	2 × 10−3	0.89 ± 0.07 **
Thyme	8 × 10−3	0.77 ± 0.11 *
	4 × 10−3	1.13 ± 0.09 ***
	2 × 10−3	1.47 ± 0.12 **
Clary sage	8 × 10−3	0.75 ± 0.04 **
	4 × 10−3	1.31 ± 0.11 **
	2 × 10−3	1.41 ± 0.10 **
Eucalyptus	8 × 10−3	0.77 ± 0.08 **
	4 × 10−3	0.93 ± 0.05 **
	2 × 10−3	1.23 ± 0.05 ***

Data represent mean ± SD of three independent experiments. * p < 0.05; ** p < 0.01; *** p < 0.001 indicate significant differences compared to untreated control cells.