Zapico Paloma, Gaya Pilar, Nuñez Manuel, Medina Margarita
Departamento Tecnología de Alimentos. CIT-INIA, Ctra. de La Coruña Km 7, Madrid 28040, Spain.
J Food Prot. 1995 Oct;58(10):1136-1138. doi: 10.4315/0362-028X-58.10.1136.
Bactericidal activity of the lactoperoxidase (LP) system against Pseudomonas fluorescens was observed in refrigerated raw goats' milk. Mean decreases in the levels of P. fluorescens of 1.69 log units at 4°C and 1.85 log units at 8°C were achieved during the first 24 h by LP-system activation. Inhibitory activity depended on temperature and length of incubation. P. fluorescens counts lower than the initial level were recorded in activated LP-system milk for 5 days at 4°C and 3 days at 8°C. Escherichia coli did not grow in raw goats' milk at 4°C, and the influence of LP-system activation at this temperature on E. coli counts was negligible. At 8°C, E. coli was able to grow in control milk with no apparent lag phase. In contrast, a lag phase of 2 days was observed in activated LP-system milk at 8°C, resulting in lower E. coli counts than those of control milk during the first 5 days.
在冷藏的生鲜山羊奶中观察到了乳过氧化物酶（LP）系统对荧光假单胞菌的杀菌活性。通过激活LP系统，在最初24小时内，4°C时荧光假单胞菌水平平均下降1.69个对数单位，8°C时平均下降1.85个对数单位。抑制活性取决于温度和孵育时间。在4°C下，激活LP系统的牛奶中荧光假单胞菌数量在5天内低于初始水平；在8°C下，3天内低于初始水平。大肠杆菌在4°C的生鲜山羊奶中不生长，此温度下激活LP系统对大肠杆菌数量的影响可忽略不计。在8°C时，大肠杆菌能够在对照牛奶中生长，且无明显滞后期。相比之下，8°C时激活LP系统的牛奶中观察到2天的滞后期，导致最初5天内大肠杆菌数量低于对照牛奶。
