Pomegranate Peel Extract-Mediated Green Synthesis of ZnO-NPs: Extract Concentration-Dependent Structure, Optical, and Antibacterial Activity

Table 3

Antibacterial activity of ZnO-NPs using the zone of inhibition method compared to Azithromycin standard drug.

Samples	Bacteria	Zone of inhibition (ZOI; diameter in mm) ± standard deviation (SD) at various concentrations
		ZnO-NPs concentration (mg/mL)			Azithromycin (control)
		50 mg/mL	100 mg/mL	200 mg/mL
Z20	S. aureus	27 ± 1.25	31 ± 1.75	32 ± 1.25	28 ± 0.25
	E. coli	22 ± 1.05	26 ± 0.25	27 ± 1.25	23 ± 0.25
Z30	S. aureus	29 ± 2.00	26 ± 1.75	34 ± 1.50	28 ± 0.50
	E. coli	22 ± 0.25	23 ± 0.25	25 ± 2.25	23 ± 0.25
Z40	S. aureus	13 ± 0.50	15 ± 0.25	17 ± 0.00	28 ± 0.25
	E. coli	12 ± 0.25	15 ± 0.50	16 ± 0.75	23 ± 0.50