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KMID : 0613820210310100905
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Journal of Life Science
2021 Volume.31 No. 10 p.905 ~ p.912
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Effect of Various LED Light Wavelengths on the Growth of Food-borne Bacteria
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Lee Ji-Eun
Xu Xiaotong
Jeong So-Mi
Kim Su-Ryong
Kim Han-Ho
Kang Woo-Sin
Ryu Si-Hyeong
Lee Ga-Hye
Ahn Dong-Hyun
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Abstract
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In this study, four common food-borne bacteria, namely, Escherichia coli, Salmonella typhimurium, Staphylococcus aureus, and Bacillus subtilis, were targeted via irradiation with 270 nm UV C-LED, 365 nm UV A-LED, 465~475 and 620~630 nm visible-LED, and 850 and 5,000~7,000 nm infrared-LED light. The effect on the growth of each bacterial species was investigated. In the case of 270 nm UV C-LED, all four strains showed inhibitory effects compared with the control group when irradiated for 10 or 30 min. Furthermore, when irradiated with 365 nm UV A-LED for 1 or 3 hr, B. subtilis showed 100% growth inhibition. When irradiated with 465~475 nm visible-LED for 1 hr, all four strains showed no significant difference from the control group but showed significant growth inhibition when irradiated for 3 hr. S. aureus and B. subtilis treated with 620~630 nm visible-LED; S. typhimurium and S. aureus treated with 850 nm infrared-LED; and E. coli, S. typhimurium, and S. aureus treated with 5,000~7,000 nm infrared-LED were confirmed to significantly proliferate compared with the control group. The results of this experiment show the potential of the use of various LED light sources as a food preservation and application technology by examining their effect on the inhibition and growth of food-borne bacteria and by grasping the characteristics of each wavelength.
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KEYWORD
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Food borne bacteria, infrared-LED, UV A-LED, UV C-LED, visible-LED
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