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RISS 인기검색어
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- 저자 : Adeline Ng, Bao Xian (검색결과 1 건)
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Kim, Min-Jeong,Adeline Ng, Bao Xian,Zwe, Ye Htut,Yuk, Hyun-Gyun Elsevier 2017 Food control Vol.82 No.-
<P><B>Abstract</B></P> <P>A 405 ± 5-nm LED illumination was evaluated for its antibacterial effect against <I>Salmonella</I> Enteritidis in phosphate buffered saline (PBS) and on the surface of cooked chicken. Its antibacterial mechanism was also elucidated by determining the injury of cellular components using metabolic inhibitors. LED illuminated three <I>S</I>. Enteritidis strains in PBS at doses as high as 0.45 kJ/cm<SUP>2</SUP> (for 7.5 h) and on cooked chicken at doses of 1.58–3.80 kJ/cm<SUP>2</SUP> (for 20–48 h) at 4, 10, and 20 °C. Results showed that illumination inactivated 1.4–2.1 log CFU/ml of populations in PBS at 0.45 kJ/cm<SUP>2</SUP>, indicating that <I>S</I>. Enteritidis 130 was more susceptible to illumination than 124 and 125 strains. At 4 °C, <I>Salmonella</I> populations on illuminated cooked chicken decreased by 0.8–0.9 log CFU/cm<SUP>2</SUP> at 3.80 kJ/cm<SUP>2</SUP>, whereas bacterial growth inhibition and delay were observed by illumination at 10 and 20 °C, respectively, regardless of bacterial strain. These results indicate that illumination temperature significantly (<I>P</I> ≤ 0.05) influenced the antibacterial effect of LED on cooked chicken. LED illumination at 4 °C resulted in the incapability of <I>Salmonella</I> cells to repair cellular damage related to metabolism of DNA, RNA, protein, and cell wall. These results suggest that 405 ± 5-nm LEDs under refrigeration conditions could control <I>Salmonella</I> linked to cooked chicken.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 405-nm LED illumination inactivated <I>Salmonella</I> Enteritidis on chicken at 4 °C. </LI> <LI> The efficacy of LED on chicken was lower than that in buffered solution. </LI> <LI> Bacterial inactivation by LED might be due to multi-damage to cellular components. </LI> <LI> LED in a food chiller could be applied to control <I>Salmonella</I> on cooked chicken. </LI> </UL> </P>
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