Table 2.

RC₅₀ values of silver fir essential oil and reference antioxidants

Sample b)	RC50 value (%) a)
	DPPH scavenging	ABTS scavenging
Silver fir oil	2.7 ± 0.63	8.5 ± 0.27
BHA c) (µg/ml)	3.7 ± 0.60	—
BHT c) (µg/ml)	39.3 ± 1.11	—
Ascorbic acid c) (µg/ml)	2.0 ± 0.13	—
Trolox d) (µM)	—	73.5 ± 0.59

^a) Concentration required for 50% reduction of DPPH (0.15 mM) or ABTS (7 mM) radicals

^b) Values are means ± SEM (n = 5).

^c) Standard compound for DPPH assay

^d) Standard compound for ABTS assay