. 2020 Jul 14;25:2515690X20937988. doi: 10.1177/2515690X20937988

Table 3.

In Vitro DPPH Radical Scavenging Activities of the Aqueous and Methanolic Stem Bark Extracts of Piliostigma thonningii.*

Concentration (μg/mL)	% DPPH radical scavenging activity of stem bark extracts of P thonningii		L-Ascorbic acid
Concentration (μg/mL)	Aqueous extract	Methanolic extract	L-Ascorbic acid
0	0.00 ± 0.00	0.00 ± 0.00	0.00 ± 0.00
0.01	66.28 ± 0.71^aB	49.43 ± 1.55^bC	67.11 ± 1.62^aC
0.1	67.74 ± 1.72^aB	52.06 ± 0.85^bC	71.49 ± 0.88^aC
1	69.61 ± 1.35^bB	56.66 ± 0.53^cB	79.55 ± 2.36^aB
10	72.24 ± 0.82^cB	95.27 ± 0.10^bA	99.01 ± 0.01^aA
100	83.28 ± 3.13^bA	97.63 ± 0.04^aA	99.08 ± 0.02^aA
1000	90.95 ± 0.50^cA	97.79 ± 0.12^bA	99.12 ± 0.01^aA
IC₅₀ (μg/mL)	0.0095	0.0325	0.0098

* Values are expressed as $\bar{x}$ ± SEM. Values with the same lowercase superscript letter across the rows and uppercase superscript letter along the columns are not significantly different (P > .05; one-way ANOVA followed by Tukey’s test).