Application of combined UV‐C light and ethanol treatment for the reduction of pathogenic Escherichia coli and Bacillus cereus on Gwamegi (semidried Pacific saury)
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Media type:
E-Article
Title:
Application of combined UV‐C light and ethanol treatment for the reduction of pathogenic Escherichia coli and Bacillus cereus on Gwamegi (semidried Pacific saury)
Contributor:
Lee, Eun‐Seon;
Park, Shin Young;
Ha, Sang‐Do
Description:
<jats:title>Abstract</jats:title><jats:sec><jats:label /><jats:p>This study investigated the combined effects of different doses of UV‐C light at 260 nm (0–1,800 mWs/cm<jats:sup>2</jats:sup>) and ethanol (0–70%) on the reduction of <jats:italic>Escherichia coli</jats:italic> and <jats:italic>Bacillus cereus</jats:italic> in experimentally contaminated <jats:italic>Gwamegi</jats:italic> (semidried Pacific saury). After combined treatment of 4,800 mWs/cm<jats:sup>2</jats:sup> of UV‐C and 70% ethanol, <jats:italic>E. coli</jats:italic> and <jats:italic>B. cereus</jats:italic> were reduced by 3.03 and 2.73 log CFU/g, respectively. However, quality losses of the product, including changes in pH, the thiobarbituric acid‐reactive substances value, and color occurred after storage for 2 weeks at 5°C. The results suggested that a combination of 2,400 mWs/cm<jats:sup>2</jats:sup> of UV‐C and 70% ethanol could potentially be used to inactivate <jats:italic>E. coli</jats:italic> and <jats:italic>B. cereus</jats:italic> in this dried fish product during storage for 7 days without any adverse changes in the qualities of the fillets.</jats:p></jats:sec><jats:sec><jats:title>Practical Applications</jats:title><jats:p>Since <jats:italic>Gwamegi</jats:italic> is traditionally air‐dried in the open, it could easily become contaminated by pathogens. Treatment with the combination of UV‐C (2,400 mWs/cm<jats:sup>2</jats:sup>) and ethanol (70%) is optimal to prevent microbial proliferation on the product during drying without causing organoleptic changes. Despite the cost, this hurdle technology can be applied in the small fishery industry.</jats:p></jats:sec>