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Little information is available on a direct comparison of the antibacterial efficacy of light emitting diode (LEDs) of different peak wavelengths. Thus, the objective of this study was to evaluate the effect of LEDs of three different wavelengths on bacterial inactivation.

Lactobacillus plantarum, Staphylococcus aureus and Vibrio parahaemolyticus were illuminated with 405, 460 and 520 nm LEDs at 4, 10 and 25°C respectively. Inactivation curves were plotted and fitted using Gompertz Model. Illumination with 405 and 460 nm LED produced significant inactivation (P < 0·05) in the population of V. parahaemolyticus (>4 log) while Lact. plantarum and Staph. aureus showed relatively less susceptibility to the LED illumination. The 520 nm LED produced negligible inactivation.

The 405 and 460 nm LEDs proved more …