. 2022 Mar 31;2022:3046483. doi: 10.1155/2022/3046483

Table 2.

ABTS and DPPH scavenging assay for the aqueous extract of the stem bark of S. purpurea L. (EBSp) and standard antioxidants.

Sample	ABTS			DPPH
	IC₅₀ [μg.mL⁻¹]	Maximum inhibition		IC₅₀ [μg.mL⁻¹]	Maximum inhibition
	IC₅₀ [μg.mL⁻¹]	%	[μg.mL⁻¹]	IC₅₀ [μg.mL⁻¹]	%	[μg.mL⁻¹]
AA	4.9 ± 0.30^a	93	10	4.3 ± 0.20^a	92	25
BHT	9.0 ± 1.40^a	98	50	15.2 ± 1.50^b	80	50
EBSp	8.1 ± 1.20^a	94	50	7.1 ± 0.70^a	91	25

AA: ascorbic acid, BHT: butylated hydroxytoluene (BHT), EBSp: aqueous extract of S. purpurea stem bark. IC₅₀: half maximal inhibitory concentration of EBSp necessary for scavenging ABTS and DPPH. Values are expressed as the mean ± SEM.