Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN, USA; Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN, USA.
Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN, USA.
Food Chem. 2020 Dec 1;332:127420. doi: 10.1016/j.foodchem.2020.127420. Epub 2020 Jun 27.
The outbreaks of Cronobacter sakazakii, Salmonella spp, and Bacillus cereus in powdered foods have been increasing in worldwide. However, an effective method to pasteurize powdered foods before consumption remains lacking. A prototype Intense Pulsed Light (IPL) system was developed to disinfect powdered foods under different IPL and environmental conditions. Synergistic effect of IPL and TiO photocatalysis on microbial inactivation was studied. The results show that high energy intensity of each pulse, high peak intensity, and short pulsed duration contributed to a high microbe inactivation. With TiO photocatalysis, one additional log reduction was achieved, bringing the total log reduction to 4.71 ± 0.07 (C. sakazakii), 3.49 ± 0.01 (E. faecium), and 2.52 ± 0.10 (B. cereus) in non-fat dry milk, and 5.42 ± 0.10 (C. sakazakii), 4.95 ± 0.24 (E. faecium), 2.80 ± 0.23 (B. cereus) in wheat flour. IPL treatment combined with the TiO photocatalysis exhibits a strong potential to reduce the energy consumption in improving the safety of powdered foods.
阪崎克罗诺杆菌、沙门氏菌和蜡样芽孢杆菌在粉末食品中的爆发在全球范围内呈上升趋势。然而，在食用前对粉末食品进行巴氏消毒的有效方法仍然缺乏。开发了一种原型强脉冲光（IPL）系统，以在不同的 IPL 和环境条件下对粉末食品进行消毒。研究了 IPL 和 TiO2 光催化对微生物灭活的协同作用。结果表明，每个脉冲的高能量强度、高峰值强度和短脉冲持续时间有助于实现高微生物灭活。在 TiO2 光催化作用下，非脂乳粉中克罗诺杆菌的总对数减少量额外增加了 1 个，达到 4.71±0.07（Cronobacter sakazakii），粪肠球菌（E. faecium）为 3.49±0.01，蜡样芽孢杆菌（B. cereus）为 2.52±0.10；在小麦粉中，克罗诺杆菌的总对数减少量额外增加了 1 个，达到 5.42±0.10（Cronobacter sakazakii），粪肠球菌（E. faecium）为 4.95±0.24，蜡样芽孢杆菌（B. cereus）为 2.80±0.23。IPL 处理与 TiO2 光催化相结合，具有降低提高粉末食品安全性所需能量消耗的巨大潜力。
