Effect of Surface Charge and Hydrophobicity Modulation on the Antibacterial and Antibiofilm Potential of Magnetic Iron Nanoparticles

Table 3

Assessment of 50% minimum inhibitory concentrations (MIC₅₀) of MNPs using microdilution method.

MNPs (µg/mL)	% inhibition
	S. aureus		E. coli
	OA-MNPs	APTMS-MNPs	OA-MNPs	APTMS-MNPs
15.625	46 ± 2	13 ± 1	31 ± 1	9 ± 1
31.25	58 ± 2	22 ± 2	47 ± 2	20.0 ± 2
62.5	62 ± 2	37 ± 1	57 ± 2	34.0 ± 1
125	65 ± 2	54 ± 4	62 ± 2	51 ± 3
250	68 ± 3	58 ± 2	68 ± 2	60 ± 1
500	80 ± 4	64 ± 1	71 ± 3	68 ± 2

Note. OA-MNP: oleic acid modified MNP and APTMS-MNP: amino-propyl trimethoxy silane MNP.