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The Efficiency of Atmospheric Dielectric Barrier Discharge Plasma against <i>Escherichia coli</i> and <i>Bacillus cereus</i> on Dried Laver (<i>Porphyra tenera</i>)
oleh: Ji Yoon Kim, Eun Bi Jeon, Man-Seok Choi, Eun Ha Choi, Jun Sup Lim, Jinsung Choi, Shin Young Park
Format: | Article |
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Diterbitkan: | MDPI AG 2020-07-01 |
Deskripsi
This study investigated the effects of atmospheric dielectric barrier discharge (DBD) plasma (1.1 kV, 43 kHz, 5–30 min, N<sub>2</sub>: 1.5 L/m) on the reduction of <i>Escherichia coli</i> and <i>Bacillus cereus</i> on dried laver. The reductions of <i>E. coli</i> and <i>B. cereus</i> 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 <i>E. coli</i> and <i>B. cereus</i> was predicted as 29.80 and 20.53 min, respectively, using the Weibull model for <i>E. coli</i> (R<sup>2</sup> = 0.95) and first-order kinetics for <i>B. cereus</i> (R<sup>2</sup> = 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.