Journal
LWT-FOOD SCIENCE AND TECHNOLOGY
Volume 139, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.lwt.2020.110553
Keywords
Ultraviolet-C light-Emitting diode (UVC-LED); Tuna fillets; Microbial inactivation; Quality attributes
Categories
Funding
- National Key R&D Program of China [2018YFD0401204]
- China Postdoctoral Science Foundation [2018M632765]
- Young Elite Scientist Sponsorship Program by the Henan Association for Science and Technology [2019HYTP028]
- Key Project of Science and Technology of Henan [192102110106]
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The study demonstrates that UVC-LEDs have a significant inactivation effect on foodborne pathogens in raw tuna fillets, while not significantly altering their physicochemical properties. However, UVC-LED irradiation leads to increased levels of lipid oxidation in the tuna fillets.
Ultraviolet light-emitting diodes (UV-LEDs) have become widespread for decontaminating the surfaces of food products and their packaging as a safer alternative to traditional mercury-vapor based UV lamps. This study aimed to investigate the effect of UVC- LEDs (275 nm) on the inactivation of foodborne pathogens and quality attributes of raw tuna fillets. Raw tuna fillets inoculated with cocktails of Salmonella Typhimurium, Listeria monocytogenes, and Escherichia coli O157:H7 were exposed to UVC-LEDs at 500-4000 mJ/cm(2). UVC-LED treatments of single-layer tuna fillets at a dose of 4000 mJ/cm(2) resulted in 1.31-, 1.86-, and 1.77- log reduction of S. Typhimurium, L. monocytogenes, and E. coli O157:H7, respectively. The pH value, water-holding capacity, metmyoglobin, texture, and color characteristics of tuna fillets were not significantly (p > 0.05) changed following the UVC-LED treatment at radiation doses up to 4000 mJ/cm(2). Nonetheless, the UVC-LED irradiation led to increased levels of lipid oxidation in tuna fillets. Overall, the present study demonstrates that UVC-LEDs are a promising technology to reduce microbial flora and maintain the physicochemical properties of fish products.
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