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Inactivation of Escherichia coli by O- water
1Department of Chemical Physics, University of Science & Technology of China, Hefei, Anhui, P.R. China.
Letters in Applied Microbiology
|July 27, 2007
Summary
Atomic oxygen radical anion (O-) water effectively inactivates Escherichia coli, causing cell damage and nucleic acid release. This discovery offers a novel approach for microbial decontamination in various applications.
Area of Science:
- Microbiology
- Biochemistry
- Materials Science
Background:
- Escherichia coli (E. coli) is a common bacterium relevant to public health.
- Understanding novel inactivation methods is crucial for microbial control.
Purpose of the Study:
- To investigate the effects of atomic oxygen radical anion (O-) water on E. coli viability and morphology.
- To explore the potential of O- water for microbial decontamination.
Main Methods:
- O- water was prepared by bubbling O-/argon flux into deionized water.
- O- and hydrogen peroxide concentrations were quantified using electron paramagnetic resonance and UV absorption spectroscopy.
- E. coli was treated with O- water, and its population, morphology, and nucleic acid release were analyzed.
Main Results:
- O- water treatment reduced E. coli population by over 3 log CFU/ml within 60 minutes.
- Scanning electron microscopy revealed significant cellular collapse in treated E. coli.
- UV absorption spectroscopy confirmed the release of nucleic acids from O- water-treated cells.
Conclusions:
- O- water effectively inactivates E. coli, inducing cellular damage and nucleic acid release.
- Reactive oxygen species likely play a key role in the observed inactivation.
- O- water presents a promising novel method for microbial decontamination of food, water, and heat-sensitive materials.
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