Table 1.

Antioxidant potential of compounds V–VIII isolated from Grewia optiva

Samples	Concentrations(μg/mL)	DPPH % inhibition(mean ± S.E.M)	DPPH IC50(μg/mL)	ABTS percent inhibition(mean ± S.E.M)	ABTS IC50(μg/mL)
Compound V	1000	82.13±1.21**	72	81.21±1.31**	74
	500	72.19±1.63**		75.93±1.81**
	250	64.15±0.94**		63.14±2.10***
	125	57.13. ±1.90***		55.15±2.51**
62.5	48.79±3.33***	47.45±2.06**
Compound VI	1000	85.21±1.10**	65	84.13±2.11**	67
	500	73.19±1.17**		76.23±2.91**
	250	65.64±1.84**		65.24±1.03***
	125	56.19. ±1.18***		56.21±2.11**
62.5	49.68±2.31***	49.18±1.26**
Compound VII	1000	87.41±1.20**	64	86.13±2.31**	65
	500	78.49±1.17**		77.19±2.10**
	250	69.53±1.11**		67.14±1.10***
	125	56.19. ±1.30***		57.19±1.11**
62.5	49.72±3.01***	49.70±1.06**
Compound VIII	1000	81.64±2.76***	118	80.23±1.37**	125
	500	72.84±1.87**		70.10±1.20**
	250	63.13±2.17**		62.19±0.90***
	125	51.10±2.39***		50.02±1.11**
62.5	41.17±1.97***	41.70±1.06**
Ascorbic acid	1000	94.88±1.63	35	93.41±0.73	35
	500	87.21±0.75		83.76±1.16
	250	78.89±1.34		77.64±3.06
	125	65.30±2.05		64.06±1.15
62.5	55.05±1.54	55.51±1.09

Notes: Data presented as mean ± S.E.M; n=3. Values significantly different as compared to positive control, P>0.05, **P<0.05, ***P<0.001. Ascorbic acid was used as a positive control.