Department of Agricultural and Biological Engineering, The Pennsylvania State University, PA 16802, USA.
Poult Sci. 2010 Mar;89(3):570-81. doi: 10.3382/ps.2008-00476.
The effectiveness of pulsed UV light on the microbial load of boneless chicken breast was investigated. Unpackaged and vacuum-packaged samples inoculated with an antibiotic-resistant strain of Salmonella Typhimurium on the top surfaces were treated with pulsed UV light for 5, 15, 30, 45, and 60 s at 5, 8, and 13 cm distance from the quartz window in the pulsed UV light chamber. The log(10) reductions of Salmonella (cfu/cm(2)) on unpackaged samples varied from 1.2 to 2.4 after a 5-s treatment at 13 cm and a 60-s treatment at 5 cm, respectively. The log(10) reductions on vacuum-packaged samples varied from 0.8 to 2.4 after the 5-s treatment at 13 cm and the 60-s treatment at 5 cm, respectively. The optimum treatment conditions were determined to be 5 cm-15 s for unpackaged samples and 5 cm-30 s for vacuum-packaged samples, both of which resulted in about 2 log(10) reduction (approximately 99%). The total energy and temperatures of samples increased with longer treatment time and shorter distance from the quartz window in the pulsed UV light chamber. The changes in chemical quality and color of samples were determined after mild (at 13 cm for 5 s), moderate (at 8 cm for 30 s), and extreme (at 5 cm for 60 s) treatments. Neither malonaldehyde contents nor color parameters changed significantly (P > 0.05) after mild and moderate treatments. Mechanical properties of the packaging material were analyzed before and after pulsed UV light treatments. The elastic modulus at both along-machine and perpendicular-to-machine direction and yield strength at perpendicular-to-machine direction changed significantly (P < 0.05) after extreme treatment. Overall, these results clearly indicate that pulsed UV light has a potential to be used for decontamination of unpackaged and vacuum-packaged poultry.
研究了脉冲紫外光对无骨鸡胸肉微生物负荷的影响。将未包装和真空包装的样品接种在顶部表面上的一种抗生素抗性鼠伤寒沙门氏菌菌株，然后用脉冲紫外光在距离脉冲紫外光腔石英窗 5、8 和 13 cm 处处理 5、15、30、45 和 60 s。未包装样品的沙门氏菌（cfu/cm2）的 log(10)减少量在 13 cm 处 5 s 处理和 5 cm 处 60 s 处理后分别为 1.2 到 2.4。真空包装样品的 log(10)减少量在 13 cm 处 5 s 处理和 5 cm 处 60 s 处理后分别为 0.8 到 2.4。确定最佳处理条件为未包装样品为 5 cm-15 s，真空包装样品为 5 cm-30 s，两者均可实现约 2 log(10)减少（约 99%）。随着处理时间的延长和距离石英窗的缩短，样品的总能量和温度增加。在温和（13 cm 处 5 s）、中度（8 cm 处 30 s）和极端（5 cm 处 60 s）处理后，测定了样品化学质量和颜色的变化。在温和和中度处理后，丙二醛含量和颜色参数均无明显变化（P > 0.05）。在脉冲紫外光处理前后分析了包装材料的机械性能。在极端处理后，沿机器方向和垂直于机器方向的弹性模量以及垂直于机器方向的屈服强度均发生了显著变化（P < 0.05）。总体而言，这些结果清楚地表明，脉冲紫外光有可能用于未包装和真空包装家禽的消毒。
