Decontamination of Listeria monocytogenes in enoki mushrooms using a 405-nm light-emitting diode illumination combined with organic acid dipping
- Authors
- Yoon, J.-H.; Chu, H.; Jeong, D.-Y.; Choi, S.; Hwang, I.-J.; Lee, S.-Y.; Kim, S.-R.
- Issue Date
- Nov-2020
- Publisher
- Academic Press
- Keywords
- Decontamination; Enoki mushroom; Light-emitting diode; Organic acid; Synergistic effect
- Citation
- LWT, v.133
- Journal Title
- LWT
- Volume
- 133
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/53582
- DOI
- 10.1016/j.lwt.2020.110048
- ISSN
- 0023-6438
1096-1127
- Abstract
- This study was undertaken to examine the effect of a 405-nm light-emitting diode (LED) illumination alone or combined with 3% organic acid dipping on the survival of Listeria monocytogenes in enoki mushrooms stored at 5 °C. Less than 1.0 or 2.1–4.4 log-reductions were achieved when L. monocytogenes in enoki mushrooms was illuminated with a 405-nm LED at 5 °C for 3 h or immersed in 3% malic acid (MA) or lactic acid (LA) at 25 °C for 30 min. Particularly, L. monocytogenes in mushrooms was significantly (p < 0.05) reduced by ≥ 4.6 log CFU g−1 after a 405-nm LED illumination (3 h) at 5 °C, followed by 3% LA dipping (30 min) at 25 °C, leading to its inability to recover in samples stored at 5 °C for up to 5 d. The combined action of a 405-nm LED and 3% LA altered the intracellular structure of L. monocytogenes cells, resulting in condensed granules or cytoplasmic protein agglutination. These findings indicate that the effectiveness of a 405-nm LED illumination can be higher when combined with organic acid dipping than that alone for decontaminating L. monocytogenes in enoki mushrooms without quality deterioration. © 2020 The Authors
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