The investigation compared the efficiency of single treatments and their combinations in reducing Listeria innocua on fresh-cut Chinese cabbage. Samples were inoculated and treated separately with sweeping frequency ultrasound (SFUS; 28 ± 2–68 ± 2 kHz) and sodium hypochlorite solution (NaOCl; 20–100 mg/L) and their combinations. Treatments were evaluated based on attainable bacterial reduction and treatment synergy. The L. innocua population in the samples reduced to 0.36–0.95 and 0.22–1.29 log CFU/g after treatment with NaOCl and SFUS respectively. The combined application of 40 ± 2 kHz SFUS and 100 mg/L NaOCl accomplished a 3.35 log CFU/g reduction of L. innocua, exhibiting an additional 2.06 log CFU/g reduction compared to single treatments, without causing adverse quality changes to leaf colour, texture, pigments and microstructure. L. innocua population reduction in Chinese cabbage was frequency-dependent rather than NaOCl concentration. Synergistic reductions of L. innocua were recorded in 85% of the combined treatments, though most of the values are below 1.0 log-cycle. The maximum synergistic values of 1.14 or 1.20 log CFU/g were achieved when 40 ± 2 kHz SFUS and 100 mg/L NaOCl or SFUS 68 kHz and 100 mg/L NaOCl were combined respectively.

该研究比较了单一处理及其组合在减少鲜切大白菜上的无毒李斯特菌中的效率。接种样品并分别用扫频超声（SFUS; 28±2–68±2 kHz）和次氯酸钠溶液（NaOCl; 20–100 mg / L）及其组合进行处理。基于可获得的细菌减少和治疗协同作用评估治疗。的无害利斯特氏菌的样品中人口/克与次氯酸钠和交换网处理后分别CFU降低到0.36-0.95和0.22-1.29日志。40±2 kHz SFUS和100 mg / L NaOCl的组合应用可实现无毒李斯特菌减少3.35 log CFU / g，与单处理相比，显示出额外的2.06 log CFU / g降低，而不会引起叶片颜色，质地，色素和微结构的不利质量变化。大白菜中的无害李斯特菌种群减少是频率依赖性的，而不是NaOCl浓度。在大多数联合治疗中，无毒李斯特菌的协同减少记录在85％，尽管大多数值均低于1.0对数周期。当分别组合40±2 kHz SFUS和100 mg / L NaOCl或SFUS 68 kHz和100 mg / L NaOCl时，获得的最大协同值为1.14或1.20 log CFU / g。