Chemical Composition and Antibacterial and Antioxidant Activities of Stem Bark Essential Oil and Extracts of Solanecio gigas

Table 5

Zone of inhibition (mm) of antibacterial activity of the investigated plant in agar diffusion test.

Extracts	Conc. mg/ml	Bacterial strains
		E. coli	K. pneumonia	S. aureus	S. pyogenes
EO	200	23.3 ± 0.36	19.3 ± 0.52	17.2 ± 0.40	18.1 ± 0.40
	100	15.8 ± 0.72	13.9 ± 0.60	13.9 ± 0.85	12.7 ± 0.64
	50	14.9 ± 0.06	13.4 ± 0.35	10.4 ± 0.40	9.5 ± 0.40
	25	10.8 ± 0.76	10.2 ± 0.72	9.1 ± 0.32	8.5 ± 0.47
MeOH	200	20.4 ± 0.45	22.0 ± 0.45	17.5 ± 0.50	18.4 ± 0.51
	100	16.4 ± 0.32	17.1 ± 0.61	15.1 ± 0.46	16.0 ± 0.65
	50	12.1 ± 0.51	10.1 ± 0.15	10.4 ± 0.32	9.3 ± 0.26
	25	9.9 ± 0.12	9.4 ± 0.38	8.4 ± 0.36	7.4 ± 0.46
EAC	200	21.9 ± 0.51	18.1 ± 0.40	17.9 ± 0.17	19.2 ± 0.40
	100	16.9 ± 0.36	14.1 ± 0.31	14.6 ± 0.40	16.8 ± 0.20
	50	13.2 ± 0.15	12.2 ± 0.15	10.4 ± 0.51	8.6 ± 0.36
	25	10.8 ± 0.40	10.1 ± 0.23	9.4 ± 0.36	7.2 ± 0.25
CHM	200	16.4 ± 0.30	14.0 ± 0.60	14.3 ± 0.41	13.2 ± 0.39
	100	12.2 ± 0.31	11.2 ± 0.75	11.4 ± 0.52	9.4 ± 0.29
	50	10.1 ± 0.23	9.1 ± 0.29	9.3 ± 0.32	7.8 ± 0.28
	25	8.2 ± 0.24	7.4 ± 0.1	7.4 ± 0.31	7.5 ± 0.07
Genta	10 mg/disc	24.7 ± 0.3	24.0 ± 0.25	22.5 ± 0.70	22.2 ± 0.21

EO: essential oil; DMSO, the negative control, has no effect.