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KMID : 0382420010270010075
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Korean Journal of Environmental Health Society
2001 Volume.27 No. 1 p.75 ~ p.82
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Studies on Growth and Decontamination of Listeria Monocytogenes Attached to Food Contact Surface Materials
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Yun Hee-Jeong
Kho Young-Lim
Lee Yung-Wook
Na Seung-Sik
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Abstract
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Microorganisms can attach firmly to food contact surface material and the resistance of adherent bacteria differ markedly from planktonic cells. Therefore, adherent cells are a potential contamination problem to the food preparation because of their high resistance, to sanitation and heat treatment. This study was carried out in order to investigate growth and decontamination of Listeria monocytogenes attached to stainless steel, glass and plastic. Listeria monocytogenes cells could attach to all types of surface at three temperatures after contact times for 24 hrs. The numbers of adherent cells were greater at higher temperatures, but not increased with incubation time. When recovery of adherent cells was investigated, after 24 hrs, the numbers of adherent cells were about 10^7, 10^10, 10^11 at 4℃, 25℃, 30℃, respectively. Planktonic cells decreased by 2 log cycles after exposure to the domestic sanitizer. Adherent cells showed high resistance to domestic sanitizers and that was dependent upon surface materials studied, being greatest on plastic followed y stainless steel and glass. Adherent cells were more resistant to heat treatment than planktonic cells. When adherent cells were exposed to the temperature of 50℃, 55℃, 57.5℃ for 10 min, their populations did not decrease significantly. When the temperature increased to 60℃, cells attached to all type of surfaces were completely inactivated for 10 min.
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