Antibacterial efficacy of 405, 460 and 520 nm light emitting diodes on Lactobacillus plantarum, Staphylococcus aureus and Vibrio parahaemolyticus.
OBJECTIVE
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.


RESULTS
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.


CONCLUSIONS
The 405 and 460 nm LEDs proved more effective in inactivating the selected foodborne bacteria in this study compared to 520 nm LED. The 405 nm LED showed the greatest antibacterial effect at the same level of energy dose.


CONCLUSIONS
The results in this study demonstrated the antibacterial efficacy of 405 nm LED on Lact. plantarum and V. parahaemolyticus, suggesting its potential for use in food industry for the control of these micro-organisms.
Food Science and Technology Programme, Department of Chemistry, National University of Singapore, Singapore, Singapore.
A
A
Kumar
Food Science and Technology Programme, Department of Chemistry, National University of Singapore, Singapore, Singapore.
V
V
Ghate
Food Science and Technology Programme, Department of Chemistry, National University of Singapore, Singapore, Singapore.
M J
MJ
Kim
Food Science and Technology Programme, Department of Chemistry, National University of Singapore, Singapore, Singapore.|National University of Singapore (Suzhou) Research Institute, Suzhou, Jiangsu, China.
W
W
Zhou
Post-Harvest Technology Department, Technology & Industry Development Group, Agri-Food & Veterinary Authority of Singapore, Singapore, Singapore.
G H
GH
Khoo
Food Science and Technology Programme, Department of Chemistry, National University of Singapore, Singapore, Singapore.|National University of Singapore (Suzhou) Research Institute, Suzhou, Jiangsu, China.
H G
http://orcid.org/0000-0001-9841-7899
HG
Yuk
D048191:Lactiplantibacillus plantarum / Q000254:growth & development / Q000528:radiation effects*; D008027:Light; D013211:Staphylococcus aureus / Q000254:growth & development / Q000528:radiation effects*; D014736:Vibrio parahaemolyticus / Q000254:growth & development / Q000528:radiation effects*
Gompertz model; food preservation; foodborne bacteria; light emitting diode; photodynamic inactivation