Inada SA, Sakurai T, Soma T and Zadrak WD
Sterilization using UV-C light has the potential to damage pathogenic bacteria and virus. However, it also has disadvantages such as material deterioration, cellular destruction and limited use depending on the sterilization target. In this study, we focus on the UVA1 light, which is near visible light, but has the potential to induce apoptosis in the cancer cells. To investigate the sterilization characteristics of UVA1 light, three peak wavelengths of 365, 385 and 405 nm were applied by UVA1-LED on E. coli colonies with irradiation doses of 0 (control), 10, 50 and 100 J/ cm2. Comparing the three peak wavelengths, 365 nm showed a significant effect with an irradiation dose of 100 J/ cm2 after which the colony growth was greatly reduced. These results show that a peak wavelength of 365 nm is sufficient and effective for sterilization if applied with a high power light source, possibly achieving the same effect as sterilization with UV-C light.
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