Photocatalytic disinfection of marine bacteria using fluorescent light

Photocatalytic disinfection of marine bacteria using fluorescent light Photocatalytic oxidation (PCO) using fluorescent light was used to disinfect two marine bacteria: Alteromonas alvinellae and Photobacterium phosphoreum . Results showed that P. phosphoreum exhibited a lower susceptibility towards PCO than A. alvinellae , which was related to their fatty acid profiles and levels of superoxide dismutase (SOD) and catalase (CAT). Results also revealed that CAT and SOD levels would be triggered by PCO reaction. In addition, PCO disinfection efficiency could be enhanced by acidic pH levels and increased temperatures, while different growth phases demonstrated diverse effects to the studied bacteria, probably due to their morphological difference or change in physiological state. Lastly intracellular leakage of potassium ion (K + ), in line with the loss of cell viability, was observed during PCO. Mineralization of bacteria by PCO was monitored by total organic carbon analysis. From the regrowth study, the tested strains failed to reactivate within 96 h after PCO treatment, indicating PCO caused irreversible bacterial inactivation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Research Elsevier

Photocatalytic disinfection of marine bacteria using fluorescent light

Water Research, Volume 42 (19) – Dec 1, 2008

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Publisher
Elsevier
Copyright
Copyright © 2008 Elsevier Ltd
ISSN
0043-1354
D.O.I.
10.1016/j.watres.2008.08.031
Publisher site
See Article on Publisher Site

Abstract

Photocatalytic oxidation (PCO) using fluorescent light was used to disinfect two marine bacteria: Alteromonas alvinellae and Photobacterium phosphoreum . Results showed that P. phosphoreum exhibited a lower susceptibility towards PCO than A. alvinellae , which was related to their fatty acid profiles and levels of superoxide dismutase (SOD) and catalase (CAT). Results also revealed that CAT and SOD levels would be triggered by PCO reaction. In addition, PCO disinfection efficiency could be enhanced by acidic pH levels and increased temperatures, while different growth phases demonstrated diverse effects to the studied bacteria, probably due to their morphological difference or change in physiological state. Lastly intracellular leakage of potassium ion (K + ), in line with the loss of cell viability, was observed during PCO. Mineralization of bacteria by PCO was monitored by total organic carbon analysis. From the regrowth study, the tested strains failed to reactivate within 96 h after PCO treatment, indicating PCO caused irreversible bacterial inactivation.

Journal

Water ResearchElsevier

Published: Dec 1, 2008

References

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