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. 2020 Jul 28;9(8):1013.
doi: 10.3390/foods9081013.

The Efficiency of Atmospheric Dielectric Barrier Discharge Plasma against Escherichia coli and Bacillus cereus on Dried Laver (Porphyra tenera)

Ji Yoon Kim  1   2 , Eun Bi Jeon  1   2 , Man-Seok Choi  1   2 , Eun Ha Choi  3 , Jun Sup Lim  3 , Jinsung Choi  3 , Shin Young Park  1   2
Affiliations

The Efficiency of Atmospheric Dielectric Barrier Discharge Plasma against Escherichia coli and Bacillus cereus on Dried Laver (Porphyra tenera)

Ji Yoon Kim et al. Foods. .

Abstract

This study investigated the effects of atmospheric dielectric barrier discharge (DBD) plasma (1.1 kV, 43 kHz, 5-30 min, N2: 1.5 L/m) on the reduction of Escherichia coli and Bacillus cereus on dried laver. The reductions of E. coli and B. cereus by 5, 10, 20, and 30 min of DBD plasma were 0.56 and 0.24, 0.61 and 0.66, 0.76 and 1.24, and 1.02 and 1.38 log CFU/g, respectively. The D-value of E. coli and B. cereus was predicted as 29.80 and 20.53 min, respectively, using the Weibull model for E. coli (R2 = 0.95) and first-order kinetics for B. cereus (R2 = 0.94). After DBD plasma 5-30 min treatment, there was no change in pH (6.20-6.21) and this value was higher than the untreated dried laver (6.08). All sensory scores in DBD plasma-treated laver were determined as >6 points. The 30 min of DBD plasma is regarded as a novel intervention for the control of potential hazardous bacteria in dried laver.

Keywords: Bacillus cereus; DBD plasma; Escherichia coli; dried laver; quality.

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Conflict of interest statement

To the best of our knowledge, the named authors (Ji Yoon Kim, Eun Bi Jeon, Man-Seok Choi, Eun Ha Choi, Jun Sup Lim, Jinsung Choi and Shin Young Park) have no conflict of interest, financial or otherwise. There are no other relationships or activities that could appear to have influenced submitted work.

Figures

Figure 1
Figure 1
A flow diagram for atmospheric dielectric barrier discharge (DBD) plasma treatment of dried laver.
Figure 2
Figure 2
Atmospheric dielectric barrier discharge (DBD) plasma device used in experiment (1.1 kV, 43 kHz, N2: 1.5 L/m).
Figure 3
Figure 3
Effects of DBD-plasma treatment on E. coli in dried laver and fitted survival curves by the Weibull model. The letters a and b indicate significant differences (p < 0.05) in reduction over DBD plasma treatment time for E. coli (Duncan’s multiple range test with 5% probability).
Figure 4
Figure 4
Effects of DBD-plasma treatment on B. cereus in dried laver and fitted survival curves by the first-order kinetics. The letters a, b, c, and d indicate significant differences (p < 0.05) in reduction over DBD plasma treatment time for B. cereus (Duncan’s multiple range test with 5% probability).
See this image and copyright information in PMC

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