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

Ji Yoon Kim; Eun Bi Jeon; Man-Seok Choi; Eun Ha Choi; Jun Sup Lim; Jinsung Choi; Shin Young Park

doi:10.3390/foods9081013

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

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

Authors

Ji Yoon Kim^{1

2}, Eun Bi Jeon^{1

2}, Man-Seok Choi^{1

2}, Eun Ha Choi³, Jun Sup Lim³, Jinsung Choi³, Shin Young Park^{1

2}

Affiliations

¹ Institute of Marine Industry, Gyeongsang National University, Tongyeong 53064, Korea.
² Department of Seafood and Aquaculture Science, Gyeongsang National University, Tongyeong 53064, Korea.
³ Department of Electrical and Biological Physics, Plasma Bioscience Research Center, Kwangwoon University, Seoul 01987, Korea.

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.