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KMID : 1007520080170061345
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Food Science and Biotechnology
2008 Volume.17 No. 6 p.1345 ~ p.1348
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Antibacterial Effect of TiO2 Photocatalytic Reactor against Food-borne Pathogens
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Kim Byung-Hoon
Ko Yeong-Mu
Ohk Seung-Ho
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Abstract
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Titanium dioxide (TiO2) shows antibacterial effects when exposed to near ultra violet (UV) light. In this study,TiO2 photocatalytic continuous reactor was designed and applied to food-borne pathogens such as Vibrio parahaemolyticusATCC 17802, Salmonella choleraesuis ATCC 14028, and Listeria monocytogenes ATCC 15313. TiO2 films were prepared byconventional sol-gel dip-coating method using titanium tetra iso-propoxide (TTIP). The antibacterial activity of photocatalyticreactor with various flow rates and UV-A illumination time showed effective bactericidal activity. As the UV-A illuminationtime 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 timepoint. These results present an effective way to exclude pathogenic bacteria from aqueous foods.
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KEYWORD
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TiO2 photocatalyst, bactericidal, Salmonella choleraesuis, Vibrio parahaemolyticus, Listeria monocytogenes
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