Table 5.

The levels of DNA single strand breaks (% of tail DNA) in HaCaT cells after the exposure to essential oils for 24 h. Data represent means ± SD of three independent experiments.

EOs	Concentrations of EOs
	0	6.25 × 10−5	1.25 × 10−4	2.5 × 10−4	5 × 10−4	1 × 10−3	2 × 10−3	4 × 10−3	8 × 10−3	1.6 × 10−2	3.2 × 10−2	6.4 × 10−2
Clary sage	7.62 ± 0.80	8.92 ± 0.10	9.21 ± 0.99	8.98 ± 0.90	8.68 ± 0.11	9.59 ± 0.26	7.88 ± 0.30	6.93 ± 0.90	7.71 ± 0.99	ND	ND	ND
Clove	8.65 ± 0.27	9.71 ± 1.09	8.91 ± 1.16	7.18 ± 0.75	8.03 ± 1.42	8.50 ± 1.31	7.09 ± 1.91	8.44 ± 0.63	7.61 ± 0.99	ND	ND	ND
Oregano	7.61 ± 1.15	9.29 ± 0.88	7.71 ± 1.45	8.82 ± 0.86	9.73 ± 0.98	9.93 ± 1.54	7.64 ± 1.47	8.27 ± 0.49	8.69 ± 0.53	ND	ND	ND
Lemongrass	9.86 ± 1.22	11.21 ± 1.46	9.95 ± 1.61	11.93 ± 1.16	10.28 ± 1.19	11.62 ± 1.46	10.74 ± 1.73	10.92 ± 1.15	9.63 ± 1.12	ND	ND	ND
Melaleuca	8.34 ± 0.58	8.29 ± 0.88	7.82 ± 0.86	7.50 ± 1.31	7.55 ± 1.04	7.19 ± 0.96	8.17 ± 1.22	8.18 ± 0.96	7.49 ± 0.66	7.56 ± 0.37	7.20 ± 0.42	7.61 ± 0.79
Arborvitae	8.29 ± 0.67	9.31 ± 1.92	9.11 ± 2.19	10.37 ± 0.89	9.07 ± 1.57	8.18 ± 1.22	10.06 ± 1.60	8.89 ± 0.66	ND	ND	ND	ND
Cassia	10.12 ± 0.66	9.33 ± 1.06	10.04 ± 1.27	8.73 ± 0.79	7.89 ± 0.78	9.86 ± 1.34	10.57 ± 0.90	8.89 ± 0.52	10.58 ± 1.11	ND	ND	ND
Lavender	9.24 ± 0.60	8.29 ± 1.36	8.61 ± 0.82	9.02 ± 1.32	7.69 ± 1.20	9.25 ± 1.00	8.27 ± 1.30	8.76 ± 0.81	9.53 ± 1.43	ND	ND	ND
Thyme	8.27 ± 1.32	9.29 ± 0.66	9.28 ± 1.04	9.02 ± 0.33	9.02 ± 1.18	9.82 ± 0.29	8.60 ± 1.37	10.09 ± 0.60	9.53 ± 1.43	ND	ND	ND
Eucalyptus	8.24 ± 0.54	7.59 ± 1.20	9.32 ± 0.32	8.58 ± 1.25	8.93 ± 1.58	9.69 ± 1.19	8.42 ± 1.70	8.40 ± 1.04	8.04 ± 0.68	ND	ND	ND

ND: (not detectable); positive control - hydrogen peroxide (300 μmol/L), 50.94 ± 1.76.