Continuous-sterilization system that uses photosemiconductor powders. [Escherichia coli]
We report a novel photochemical sterilization system in which Escherichia coli cells were sterilized with photosemiconductor powders (titanium oxide). For sterilization that could be used in practice, it was necessary to separate the TiO/sub 2/ powders from the cell suspension. Therefore, semiconductor powders were immobilized on acetylcellulose membranes. We constructed a continuous-sterilization system consisting of TiO/sub 2/-immobilized acetylcellulose membrane reactor, a mercury lamp, and a masterflex pump. As a result, under the various sterilization conditions examined, E.coli (10/sup 2/ cells per ml) was sterilized to < 1% survival when the cell suspension flowed in this system at a mean residence time of 16.0 min under irradiation (1800 microeinsteins/m/sup 2/ per s). We found that this system was reusable.
- Research Organization:
- Tokyo Univ. of Agriculture and Technology (Japan)
- OSTI ID:
- 6861269
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 54:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ESCHERICHIA COLI
BIOLOGICAL RADIATION EFFECTS
STERILIZATION
TITANIUM OXIDES
USES
MORTALITY
PHOTOCHEMICAL REACTIONS
ULTRAVIOLET RADIATION
BACTERIA
BIOLOGICAL EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
MICROORGANISMS
OXIDES
OXYGEN COMPOUNDS
RADIATION EFFECTS
RADIATIONS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
560300* - Chemicals Metabolism & Toxicology
560130 - Radiation Effects on Microorganisms