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Effectiveness of visible and ultraviolet light emitting diodes for inactivation of Staphylococcus aureus, Pseudomonas aeruginosa,and Escherichia coli: a comparative study

Malik, Sameen Ahmed and Tan, Tian Swee and Nik Malek, Nik Ahmad Nizam and Yahya, Azli and Emoto, Takahiro and Akutagawa, Masatake and Leong, Kah Meng and Tan, Jia Hou and Tengku Alang, Tengku Ahmad Iskandar and Ling, Kelvin Chia Hiik (2019) Effectiveness of visible and ultraviolet light emitting diodes for inactivation of Staphylococcus aureus, Pseudomonas aeruginosa,and Escherichia coli: a comparative study. Malaysian Journal of Fundamental and Applied Sciences, 15 (4). pp. 572-576. ISSN 2289-5981

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Abstract

The rapid use of ultraviolet light emitting diodes (UV-LEDs) in various disinfection applications is growing tremendously due to their advantages unachievable using UV lamps. In this study, a comparison of standard LED at 460 nm wavelength and UVA LED at 385 nm was conducted to determine their effectiveness in disinfection of frequently isolated pathogens in hospitals (Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli). Determination of disinfection efficiency was carried out by measuring inhibition zone. Effects of varied exposure time on the inactivation of pathogenic microorganisms was studied. The results demonstrated that LED does not have germicidal activities. The highest inactivation for UVA LED was achieved for Pseudomonas aeruginosa. Linear relationship was found between exposure time and log reduction. This study showed that UVA LEDs can effectively inactivate significantly higher number of microorganisms hence can be used in disinfection of various applications.

Item Type:Article
Uncontrolled Keywords:Visible LED, UVA-LED, pathogens, inactivation effectiveness
Subjects:Q Science > QD Chemistry
Divisions:Biosciences and Medical Engineering
ID Code:85034
Deposited By: Fazli Masari
Deposited On:29 Feb 2020 13:24
Last Modified:29 Feb 2020 13:24

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