PDF(Pubmed)
Abstract：
Lactoperoxidase systems (LPSs) can enhance the microbiological quality of raw milk when there is lack of cooling facilities. In this study, a total of 250 milk samples were collected from farmers, collectors, and factories. Experimental samples were both LPS-activated morning and overnight milk. The samples were tested with several chemical and microbiological tests, such as total bacterial count (TBC), total coliform count (TCC), and Escherichia coli count (EC). Results indicated that all LPS-activated milk samples had a higher quality than all the control samples. For instance, both the morning and overnight farm milk samples had mean TBCs of 5.79 log and 6.55 log cfu/mL, which is significantly (p < 0.05) lower than the control samples\' mean TBC of 6.73 log and 7.31 log cfu/mL, respectively. When this was compared with the Ethiopian Standard, 51.4% of morning and 39.5% of overnight farm milk with LPS activation met the acceptable quality, while only 28% of morning and 15.7% of overnight control milk met the standard. Moreover, LPS activation has also significantly improved the shelf life of collectors\' raw milk and pasteurized milk at the factories. Therefore, a better hygienic practice with LPS application can be practiced in conditions that lack cooling infrastructure and electricity.
摘要：
当缺乏冷却设施时，乳过氧化物酶系统（LPSs）可以提高原料奶的微生物质量。在这项研究中,总共从农民那里收集了250份牛奶样本，收藏家,和工厂。实验样品均为LPS活化的早晨牛奶和过夜牛奶。样品进行了几次化学和微生物测试，如细菌总数(TBC)，总大肠杆菌计数(TCC)，和大肠杆菌计数（EC）。结果表明,所有LPS活化的乳样品具有比所有对照样品更高的质量。例如,早晨和过夜农场牛奶样品的平均TBC为5.79log和6.55logcfu/mL，显着（p<0.05）低于对照样品的平均TBC为6.73log和7.31logcfu/mL，分别。当这与埃塞俄比亚标准相比时，51.4％的早晨和39.5％的农场隔夜牛奶与LPS激活达到可接受的质量，而只有28%的早晨和15.7%的隔夜对照牛奶符合标准。此外，LPS的激活也显著改善了工厂的原料奶和巴氏杀菌奶的保质期。因此,在缺乏冷却基础设施和电力的条件下，可以使用LPS应用更好的卫生实践。
