Antimicrobial effects of zero-valent iron nanoparticles on gram-positive Bacillus strains and gram-negative Escherichia coli strains

Table 2 XPS analysis of B. subtilis 3610, B. thuringiensis 407, oxidized Fe NPs, E. coli K12, and E. coli ATCC11634

Sample	Integrated area percentages of iron species (%)
Fe species	Fe (2p _3/2)
Fe species	Fe(0)	Fe(II)	Fe(III)
Bs 3610	17.6	27.0	55.4
Bt 407	11.9	26.9	61.2
Oxidized Fe(ZVI) NPs	0.0	39.2	60.8
Ec K12	ND	ND	ND
Ec ATCC11634	ND	ND	ND

The Fe₂O₃ content was over 50% in both Bacillus strains, but the percentage of FeS was substantially lower. In addition, the Fe content was minimal in Bacillus strains
ND not detected

ISSN: 1477-3155