Inactivation of phage Qß by 254nm UV light and titanium dioxide photocatalyst

Autor:	Miyako Nakamura, Shinichiro Ohgaki, Seockheon Lee
Rok vydání:	1998
Předmět:	Environmental Engineering biology Light irradiation General Medicine biology.organism_classification Photochemistry Titanium oxide Bacteriophage chemistry.chemical_compound chemistry Titanium dioxide Photocatalysis Nucleic acid Water treatment Irradiation
Zdroj:	Journal of Environmental Science and Health, Part A. 33:1643-1655
ISSN:	1532-4117 1093-4529
DOI:	10.1080/10934529809376809
Popis:	The disinfection efficacy of UV light irradiation at wavelength of 254 nm over a titanium dioxide (TiO2) suspension was compared to that of UV alone. Bacteriophage Qs was used as a model virus for the study. Qs in sterilized pure water and TiO2 suspension was irradiated by a 0.4 mW/cm2 intensity of 254nm UV light. The UV light over TiO2 was more effective than 254nm UV alone in inactivating Qs. 3.5‐log10 Qs inactivation was achieved by UV irradiation over TiO2 suspension (103 mg/L) after 2 minutes of irradiation, while UV alone inactivated 2‐log10. Using a MPN‐PCR method, a ca. 1‐log10‐unit decrease in Qs RNA concentration was detected after 3 minutes of photocatalytic irradiation. The decrease was explained by damage to nucleic acid of phage Qs due to radical oxidation, which is generated by photocatalysis.
Databáze:	OpenAIRE
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