Laboratory of Food Microbiology, Wageningen University, Wageningen, The Netherlands.
Int J Food Microbiol. 2010 Aug 15;142(1-2):260-3. doi: 10.1016/j.ijfoodmicro.2010.06.021. Epub 2010 Jun 30.
Survival of Listeria monocytogenes on a conveyor belt material with or without antimicrobial additives, in the absence or presence of food debris from meat, fish and vegetables and at temperatures of 10, 25 and 37 degrees C was investigated. The pathogen survived best at 10 degrees C, and better at 25 degrees C than at 37 degrees C on both conveyor belt materials. The reduction in the numbers of the pathogen on belt material with antimicrobial additives in the first 6h at 10 degrees C was 0.6 log unit, which was significantly higher (P<0.05) than the reduction of 0.2 log unit on belt material without additives. Reductions were significantly less (P<0.05) in the presence of food residue. At 37 degrees C and 20% relative humidity, large decreases in the numbers of the pathogen on both conveyor belt materials during the first 6h were observed. Under these conditions, there was no obvious effect of the antimicrobial substances. However, at 25 degrees C and 10 degrees C and high humidity (60-75% rh), a rapid decrease in bacterial numbers on the belt material with antimicrobial substances was observed. Apparently the reduction in numbers of L. monocytogenes on belt material with antimicrobial additives was greater than on belt material without additives only when the surfaces were wet. Moreover, the presence of food debris neutralized the effect of the antimicrobials. The results suggest that the antimicrobial additives in conveyor belt material could help to reduce numbers of microorganisms on belts at low temperatures when food residues are absent and belts are not rapidly dried.
研究了在 10、25 和 37°C 温度下，有无抗菌添加剂的情况下，在存在或不存在来自肉、鱼和蔬菜的食物残渣的情况下，李斯特菌在输送带材料上的存活情况。在两种输送带材料上，该病原体在 10°C 下的存活率最高，在 25°C 下的存活率高于 37°C。在 10°C 下，前 6 小时，抗菌添加剂输送带材料上病原体数量减少了 0.6 个对数单位，与无添加剂输送带材料相比，减少了 0.2 个对数单位，差异有统计学意义（P<0.05）。在存在食物残渣的情况下，减少量显著较小（P<0.05）。在 37°C 和相对湿度 20%的条件下，在前 6 小时内，两种输送带材料上病原体数量均大幅减少。在这些条件下，抗菌物质没有明显的效果。然而，在 25°C 和 10°C 以及高湿度（60-75%rh）下，抗菌物质输送带材料上的细菌数量迅速减少。显然，只有在表面湿润的情况下，抗菌添加剂输送带材料上的李斯特菌数量减少才大于无添加剂输送带材料。此外，食物残渣的存在会中和抗菌剂的作用。结果表明，当不存在食物残渣且输送带未迅速干燥时，输送带材料中的抗菌添加剂有助于减少低温下输送带表面微生物的数量。
