Photoelectrocatalytic Inactivation Mechanism of Bacteria
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Sun, Hongwei
Li, Guiying
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Taicheng An, Huijun Zhao, Po Keung Wong
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Abstract
This chapter reviews literature about the mechanisms associated with the photocatalytic (PC) and photoelectrocatalytic (PEC) inactivation of bacteria. It introduces PEC system configuration, reviews bactericide identification (mainly the reactive species (RSs) generated in situ), and identifies the RSs attacking bacterial cell targets. The review concludes that the major cellular component first attacked by RSs is the cell envelope, particularly the membrane lipid contents, resulting in the increase of membrane permeability and the leakage of the bacterial cytoplasmic substances such as K+, proteins, and DNA. In addition, intracellular enzymes (such as superoxide dismutase (SOD) and catalase), the proteins, and the DNA might also be attacked by the RSs generated inside the cell. This induces enzyme inactivation and oxidative damage to proteins and DNA. Any of these cellular disruptions may be responsible for bacterial
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Advances in Photocatalytic Disinfection
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Biological Sciences not elsewhere classified