RuCo-ANFs with different proportions can be successfully prepared by magnetron sputtering, and their lattice constants can be adjusted accurately. In the RuCo-ANF, there is an obvious electronic interaction between Ru...
Food-borne diseases are widespread all over the world, and food safety has attracted much attention. This study is the first to use plasma to activate acidic electrolyzed water (AEW) to obtain a new disinfectant for food processing. The germicidal efficacy of plasma-activated acidic electrolyzed water (PA-AEW) on B. subtilis suspension and biofilm was investigated. Furthermore, the synergistic effect of different bactericidal factors was inferred by investigating the physicochemical parameters of PA-AEW and the influencing factors of bactericidal effect. The results demonstrate that PA-AEW is a highly effective and rapid disinfectant. The killing logarithm (KL) value of PA-AEW on B. subtilis suspension could reach 2.33 log10CFU/mL with a sterilization time of 10 s, which is significantly higher than that of AEW (KL = 0.58 log10CFU/mL) and plasma-activated water (PAW) (KL = 0.98 log10CFU/mL) (significant difference, p < 0.01). Moreover, the KL value of the B. subtilis biofilm of PA-AEW was 2.41 log10CFU/mL, better than that of PAW and AEW (significant difference, p < 0.01), indicating that PA-AEW has important application prospects in food processing. The synergistic effect should come from the interaction between reactive chlorine species (RCS) and reactive oxygen and nitrogen species (RONS) in PA-AEW.
The food hygiene
problems caused by bacterial biofilms in food
processing equipment are directly related to human life safety and
health. Therefore, it is of great strategic significance to study
new food sterilization technology. An acidic electrolyzed water (AEW)
disinfectant is an electrochemical sterilization technology which
has the characteristics of wide adaptability, high efficiency, and
environmental friendliness. However, since the sterilization efficiency
of AEW for biofilms is not ideal, it is necessary to increase the
available chlorine content (ACC) in AEW. A feasible method to increase
the ACC is by increasing the chlorine evolution reaction (CER) selectivity
of the electrode for AEW preparation. In this paper, the RuO
2
@TiO
2
electrode was prepared by thermal decomposition
combined with high-vacuum magnetron sputtering. Compared with the
oxygen evolution reaction (OER) activity of an ordinary RuO
2
electrode, the OER activity of the RuO
2
@TiO
2
electrode is significantly reduced. However, the CER activity of
the RuO
2
@TiO
2
electrode is close to the OER
activity of RuO
2
. The CER mechanism of the RuO
2
@TiO
2
electrode is the second electron transfer, and the
OER mechanism is the formation and transformation of OH
ads
. The potential difference between the CER and OER of the RuO
2
@TiO
2
electrode is 174 mV, which is 65 mV higher
than that of the RuO
2
electrode, so the selectivity of
the CER of the RuO
2
@TiO
2
electrode is remarkably
improved. During the preparation of AEW, the ACC obtained with the
RuO
2
@TiO
2
electrode is 1.7 times that obtained
with the RuO
2
electrode. In the sterilization experiments
on
Escherichia coli
and
Bacillus subtilis
biofilms, the logarithmic killing
values of AEW prepared the by RuO
2
@TiO
2
electrode
are higher than those of AEW prepared by the RuO
2
electrode.
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