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Antibacterial Effect of $TiO_2$ Photocatalytic Reactor against Food-borne Pathogens  

Kim, Byung-Hoon (Department of Dental Materials, 2nd Stage of Brain Korea 21, College of Dentistry, Chosun University)
Cho, Dong-Lyun (Faculty of Applied Chemistry, 2nd Stage of Brain Korea 21, Chonnam National University)
Ohk, Seung-Ho (Department of Oral Microbiology, 2nd Stage of Brain Korea 21 for School of Dentistry, Chonnam National University)
Ko, Yeong-Mu (Department of Dental Materials, 2nd Stage of Brain Korea 21, College of Dentistry, Chosun University)
Publication Information
Food Science and Biotechnology / v.17, no.6, 2008 , pp. 1345-1348 More about this Journal
Abstract
Titanium dioxide ($TiO_2$) shows antibacterial effects when exposed to near ultra violet (UV) light. In this study, $TiO_2$ photocatalytic continuous reactor was designed and applied to food-borne pathogens such as Vibrio parahaemolyticus ATCC 17802, Salmonella choleraesuis ATCC 14028, and Listeria monocytogenes ATCC 15313. $TiO_2$ films were prepared by conventional sol-gel dip-coating method using titanium tetra iso-propoxide (TTIP). The antibacterial activity of photocatalytic reactor with various flow rates and UV-A illumination time showed effective bactericidal activity. As the UV-A illumination time increased, survival rates of those bacteria decreased. After 60 min of UV-A illumination, the survival rates of V. parahaemolyticus and S. choleraesuis were less than 0.1%. However, that of L. monocytogenes was about 5% at that time point. These results present an effective way to exclude pathogenic bacteria from aqueous foods.
Keywords
$TiO_2$ photocatalyst; bactericidal; Salmonella choleraesuis; Vibrio parahaemolyticus; Listeria monocytogenes;
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