Antibacterial effect of light emitting diodes of visible wavelengths on selected foodborne pathogens at different illumination temperatures
The antibacterial effect of light emitting diodes (LEDs) in the visible region (461, 521 and
642 nm) of the electromagnetic spectrum was investigated on Escherichia coli O157: H7,
Salmonella typhimurium, Listeria monocytogenes and Staphylococcus aureus. The
irradiances of the 461, 521 and 642 nm LEDs were 22.1, 16 and 25.4 mW/cm 2,
respectively. Bacterial cultures suspended in tryptic soy broth were illuminated by 10-watt
LEDs at a distance of 4.5 cm for 7.5 h at 20, 15 and 10° C. Regardless of the bacterial …
642 nm) of the electromagnetic spectrum was investigated on Escherichia coli O157: H7,
Salmonella typhimurium, Listeria monocytogenes and Staphylococcus aureus. The
irradiances of the 461, 521 and 642 nm LEDs were 22.1, 16 and 25.4 mW/cm 2,
respectively. Bacterial cultures suspended in tryptic soy broth were illuminated by 10-watt
LEDs at a distance of 4.5 cm for 7.5 h at 20, 15 and 10° C. Regardless of the bacterial …
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