Journal
LWT-FOOD SCIENCE AND TECHNOLOGY
Volume 118, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.lwt.2019.108791
Keywords
Bacteriophage; Biocontrol; LSE7621; Narrow-spectrum; Salmonella enteritidis
Categories
Funding
- National Natural Science Foundation of China [31801629]
- Tianjin Key Laboratory of Food Biotechnology, Tianjin University of Commerce [TJCU-KLFB-18104]
- Education Bureau of Sichuan Province [17ZB0337]
- National Key R&D Program of China [2017YFC1600100]
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As the natural antibacterial agents, bacteriophages have great potential for controlling food pathogens. Compared to broad-spectrum bacteriophages, narrow-spectrum bacteriophages can reduce the risk of developing community-wide resistance and have little impact on microbial flora. The present study aimed to isolate and characterize a narrow-spectrum bacteriophage that effectively controlled Salmonella enterica serovar Enteritidis (Salmonella Enteritidis) in food. A narrow-spectrum bacteriophage LSE7621, which can effectively lyse Salmonella Enteritidis, was obtained from sewage by the double-layer agar plate method. LSE7621, which belonged to the order Caudovirales and family Myoviridae, showed good pH tolerance (pH 4.0-11.0) and thermal stability (30-50 degrees C). LSE7621 was able to significantly and effectively control Salmonella on lettuce and tofu (p < 0.05). When LSE7621 was administered on lettuce, the number of Salmonella was reduced by 0.86 log(10) CFU/mL (MOI = 100) and 1.02 log(10) CFU/mL (MOI = 1) within 6 h. When LSE7621 was administered on tofu, the number of Salmonella decreased by 3.55 log(10) CFU/mL (MOI = 100) and 1.86 log(10) CFU/mL (MOI = 1) within 4 h. This is the first report about narrow-spectrum bacteriophage infecting Salmonella Enteritidis. This study provides insights into fundamental researches on narrow-spectrum bacteriophage and facilitates the utilization of new bacteriophage resource.
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