文献类型： 外文期刊
作者： Zhang, Y. X. 1 ; Wang, F. 2 ; Wu, H. 2 ; Fan, L. L. 1 ; Wang, Y. 1 ; Liu, X. L. 2 ; Zhang, H. Z. 2 ;
作者机构： 1.Jiangsu Univ, Sch Food & Biol Engn, Zhenjiang 212013, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Argo Prod Proc, Nanjing 210014, Peoples R China
关键词： high power pulse microwave; Listeria monocytogenes; sterilisation; membrane damage
期刊名称：INTERNATIONAL FOOD RESEARCH JOURNAL （ 影响因子：1.169； 五年影响因子：1.401 ）
ISSN： 1985-4668
年卷期： 2022 年 29 卷 5 期
页码：
收录情况： SCI
摘要： In the present work, Listeria monocytogenes was used as the target strain to investigate the sterilising potential and mechanism of high power pulse microwave (HPPM). Results showed that the inactivation was positively correlated with the pulse frequencies and operating times. The count of Listeria monocytogenes was decreased by 5.09 log CFU/mL under 200 Hz for 9 min, which was used as the optimised condition to further explore the sterilisation mechanism. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that the L. monocytogenes cells of untreated group presented intact surfaces, clear boundary, and its intracellular contents distributed uniformly in the cytoplasm. Following treatment, the cell wall surfaces began to deform in small areas, and cell membranes were severely ruptured, thus resulting in the appearance of electron transmission areas. Extracellular protein and nucleic acid contents, represented by OD260 nm and OD280 nm, increased with the increase in operating time significantly. After treatment, SDS-PAGE profiles of whole-cell proteins displayed that the protein bands became lighter or even disappeared. Na+ K+-ATPase activities and intracellular ATP content decreased by 72.97 and 79.09%, respectively. This was consistent with the cell viability of L. monocytogenes observed by confocal laser scanning microscopy. Overall, the sterilisation mechanism of HPPM on L. monocytogenes may be caused by membrane damage, intracellular component leakage, and energy metabolism hindrance.
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