Table 2.

Anti-oxidant effect of the tested extracts.

	Calluna vulgaris		Ferula hermonis		Tribulus terrestris
Concentration	TBARS inhibition (%)	DPPH scavenging (%)	TBARS inhibition (%)	DPPH scavenging (%)	TBARS inhibition (%)	DPPH scavenging (%)
25 ug/mL	20 ± 2.1a	30 ± 1.1a	11 ± 0.9a	21 ± 4.3a	18 ± 1.4a	23 ± 5.1a
50 ug/mL	30 ± 1.9b	45 ± 3.1b	29 ± 2.1b	32 ± 1.7b	29 ± 3.2b	41 ± 3.9b
70 ug/mL	51 ± 3.5c	60 ± 5.1c	41 ± 5.6c	45 ± 2.9c	33 ± 2.6b	51 ± 3.2c
100 ug/mL	64.2 ± 4.2d	80 ± 3.5d	57.8 ± 3.4d	69 ± 5.3d	43 ± 2.8c	54 ± 1.2c

Within the column, means with different letters (a, b, c, or d ) were significantly different at p < 0.05. Mean with letter (a) was significantly the lowest value while mean with the letter (d) was significantly the highest value. If two or three groups have the same letters that means there is no significant difference detected at p < 0.05.