Biological Synthesis of Silver Nanoparticles by Cell-Free Extract of Spirulina platensis

Table 1

Antibacterial activity of AgNPs.

Bacterial strain	AgNPs (1 mg/mL)				Mean ± SE	Gentamicin (+)	S. platensis extracts	AgNO3 (1 mM)
	(ZOI in mm)					Control (ZOI in mm)	(ZOI in mm)	(ZOI in mm)
Escherichia coli, MTCC-9721	24	23	25	25	24.3 ± 0.48	28	12	15
Proteus vulgaris, MTCC-7299	30	32	34	29	31.3 ± 1.11	22	8	10
Klebsiella pneumoniae, MTCC-9751	26	27	24	23	25.0 ± 0.91	16	8	11
Staphylococcus aureus, MTCC-9542	30	33	30	31	31.0 ± 0.71	25	9	12
S. epidermidis, MTCC-2639	21	20	19	20	20.0 ± 0.41	24	9	11
Bacillus cereus, MTCC-9017	23	25	26	23	24.3 ± 0.75	10	8	9