Table 7.

Antioxidant Activities of the Crude Extract and Solvent Fractions of Stem Bark of F. angolensis in DPPH Assay Model

% Inhibition of DPPH
Concentration (mg/mL)	Aqueous Fraction	Chloroform Fraction	n- Butanol Fraction	Crude Extract	Ascorbic Acid
50	13.24 ± 1.52	30.07 ± 0.80	39.19 ±0.55	44.37 ±0.66	48.67 ±1.23
100	28.64 ± 0.45	43.54 ±1.11	56.62 ±1.20	65.40 ±0.57	69.53 ±0.88
200	42.37 ± 0.48	55.22 ±0.12	68.51 ±0.49	72.37 ±1.02	76.19 ±0.36
400	48.94 ± 0.78	65.37 ± 0.75	75.27 ±0.46	78.79 ±0.66	83.55 ±0.73
600	59.37 ± 1.03	70.79 ± 0.34	79.27 ±0.67	82.48 ±0.59	90.34 ±0.84
800	68.84 ± 0.66	78.64 ± 0.47	81.27 ±0.82	85.49 ±0.64	94.27 ±0.54
1000	71.42±0.26	83.71 ± 1.22	86.44 ±1.34	90.57 ±0.65	98.07 ±0.18
IC50 mg/mL	14.93 ± 0.44	8.33 ± 0.15	6.11 ±0.23	3.64 ±0.12	2.72 ±0.34

Notes: The values are presented as means + standard error of the mean (SEM); n = 3, triplicate measurements.

Abbreviation: IC50, 50% inhibitory concentration.