Medical & Biological Engineering & Computing

, Volume 45, Issue 12, pp 1237–1241 | Cite as

Development of a new water sterilization device with a 365 nm UV-LED

  • Mirei Mori
  • Akiko Hamamoto
  • Akira Takahashi
  • Masayuki Nakano
  • Noriko Wakikawa
  • Satoko Tachibana
  • Toshitaka Ikehara
  • Yutaka Nakaya
  • Masatake Akutagawa
  • Yohsuke Kinouchi
Short Communtication

Abstract

Ultraviolet (UV) irradiation is an effective disinfection method. In sterilization equipment, a low-pressure mercury lamp emitting an effective germicidal UVC (254 nm) is used as the light source. However, the lamp, which contains mercury, must be disposed of at the end of its lifetime or following damage due to physical shock or vibration. We investigated the suitability of an ultraviolet light-emitting diode at an output wavelength of 365 nm (UVA-LED) as a sterilization device, comparing with the other wavelength irradiation such as 254 nm (a low-pressure mercury lam) and 405 nm (LED). We used a commercially available UVA-LED that emitted light at the shortest wavelength and at the highest output energy. The new sterilization system using the UVA-LED was able to inactivate bacteria, such as Escherichia coli DH5α, Enteropathogenic E. coli, Vibrio parahaemolyticus, Staphylococcus aureus, and Salmonella enterica serovar Enteritidis. The inactivations of the bacteria were dependent on the accumulation of UVA irradiation. Taking advantage of the safety and compact size of LED devices, we expect that the UVA-LED sterilization device can be developed as a new type of water sterilization device

Keywords

UVA-LED Disinfection Sterilization Bacteria 

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Copyright information

© International Federation for Medical and Biological Engineering 2007

Authors and Affiliations

  • Mirei Mori
    • 1
  • Akiko Hamamoto
    • 2
  • Akira Takahashi
    • 2
  • Masayuki Nakano
    • 2
  • Noriko Wakikawa
    • 2
  • Satoko Tachibana
    • 2
  • Toshitaka Ikehara
    • 3
  • Yutaka Nakaya
    • 2
  • Masatake Akutagawa
    • 1
  • Yohsuke Kinouchi
    • 1
  1. 1.Department of Electrical and Electronic Engineering, Institute of Socio Techno SciencesThe University of TokushimaTokushima CityJapan
  2. 2.Department of Nutrition and Metabolism, Institute of Health BiosciencesThe University of Tokushima Graduate SchoolTokushima CityJapan
  3. 3.Department of Physiology, Institute of Health BiosciencesThe University of Tokushima Graduate SchoolTokushima CityJapan

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