Suitability of ultraviolet (A)-light emitting diode for air stream disinfection

Mostafa Gadelmoula; Xin Lian; Miku Maeda; Mutsumi Aihara; Kazuaki Mawatari; Akiko Hamamoto; Yumi Harada; Masayuki Yamato; Masatake Akutagawa; Yutaka Nakaya; Yohsuke Kinouchi; Akira Takahashi

doi:10.2152/jmi.56.150

Originals

Suitability of ultraviolet (A)-light emitting diode for air stream disinfection

Mostafa Gadelmoula, Xin Lian, Miku Maeda, Mutsumi Aihara, Kazuaki Mawatari, Akiko Hamamoto, Yumi Harada, Masayuki Yamato, Masatake Akutagawa, Yutaka Nakaya, Yohsuke Kinouchi, Akira Takahashi

Author information

Mostafa Gadelmoula
Department of Preventive Environment and Nutrition
Xin Lian
Department of Preventive Environment and Nutrition
Japan Science and Technology Agency
Miku Maeda
Department of Electrical and Electronic Engineering, Institute of Socio Techno Sciences, the University of Tokushima Graduate School
Mutsumi Aihara
Department of Preventive Environment and Nutrition
Japan Science and Technology Agency
Kazuaki Mawatari
Department of Preventive Environment and Nutrition
Akiko Hamamoto
Department of Preventive Environment and Nutrition
Yumi Harada
Department of Preventive Environment and Nutrition
Masayuki Yamato
Department of Preventive Environment and Nutrition
Masatake Akutagawa
Department of Electrical and Electronic Engineering, Institute of Socio Techno Sciences, the University of Tokushima Graduate School
Yutaka Nakaya
Department of Nutrition and Metabolism, Institute of Health Biosciences, the University of Tokushima Graduate School
Yohsuke Kinouchi
Department of Electrical and Electronic Engineering, Institute of Socio Techno Sciences, the University of Tokushima Graduate School
Akira Takahashi
Department of Preventive Environment and Nutrition

Keywords: airborne pathogens, air disinfection, ultraviolet germicidal irradiation (UVGI), ultraviolet light emitting diodes (UV-LED)

JOURNAL FREE ACCESS

2009 Volume 56 Issue 3,4 Pages 150-156

DOI https://doi.org/10.2152/jmi.56.150

Details

Abstract

We previously developed a high powered light-emitting diode device capable of discharging germicidal ultraviolet irradiation (UVA-LED) at an approximate wavelength of 365 nm. This study examined the bactericidal activity of UVA-LED in moving air streams. Aerosols of Escherichia coli DH5α were exposed to UVA-LED irradiation using a stable current (0.5 A and 1.2 mW/cm²) or pulse current (1.0 A and 0.2 mW/cm²). Settle plate analysis was used for bioaerosol sampling, where results were expressed as Colony Forming Units. A -3 Log inactivation of the E. coli population occurred after 75 minutes of constant exposure to stable current. The pulse current produced inactivation within a similar timeframe. Our results might be significant as a basic study for further investigations about the effect of UVA-LED on airborne bacteria and its suitability for air disinfection applications. J. Med. Invest. 56: 150-156, August, 2009

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