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. 2018 Jan 9;8:2678. doi: 10.3389/fmicb.2017.02678

FIGURE 5.

FIGURE 5

Inactivation of E. coli and B. subtilis using different treatment protocols and nisin-unloaded iron oxide NP with Ca as a capping agent (IONP-Ca), where PEF – 10 kV cm-1 × 8 × 100 μs; EMF1 – 3.3 T × 50, 0.25 Hz; EMF2 – 10 mT, 100 kHz, 2 min. The number of residual culturable cells in the samples after the PEF treatment (CFUT) was compared with ones in the control samples without treatment (CFUC). The asterisk () represents statistically significant (P < 0.05) difference versus NPs only treatment.