The Effect of Charge at the Surface of Silver Nanoparticles on Antimicrobial Activity against Gram-Positive and Gram-Negative Bacteria: A Preliminary Study

Table 2

Previous published reports regarding the antibacterial activity of AgNPs with different characteristics against our test organisms.

Studies	Physical properties of AgNPs	Bacteria	MIC (m/L)
Kim et al. 2007 [24]	13.4 nm (negatively charged)	E. coli	6.6 × 10^−9
		S. aureus	3.3 × 10^−8
Agnihotri et al. 2014 [25]	7 nm (negatively charged)	E. coli	1.8 to 8.3 × 10^−4
		S. aureus	6.5 × 10^−4
Hernndez-Sierra et al. 2008 [26]	25 nm (charge not determined)	S. mutans	4.5 × 10^−5
Lara et al. 2010 [27]	100 nm (charge not determined)	S. pyogenes	6.3 × 10^−2
Chudasama et al. 2010 [28]	8.2 nm (charge not determined)	P. vulgaris	2.5 × 10^−3