Influence of pH, salt, and temperature on nisin resistance in Listeria monocytogenes

被引:37
作者
DeMartinis, ECP
Crandall, AD
Mazzotta, AS
Montville, TJ
机构
[1] RUTGERS STATE UNIV,COOK COLL,NEW JERSEY AGR EXPT STN,DEPT FOOD SCI,NEW BRUNSWICK,NJ 08903
[2] UNIV SAO PAULO,DEPT NUTR & FOODS,SAO PAULO,BRAZIL
关键词
Listeria monocytogenes; nisin; resistance;
D O I
10.4315/0362-028X-60.4.420
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The influence of pH (5.0, 5.5, and 6.0), salt (0.5, 2.0, and 3.5%) and temperature (10, 20, and 30 degrees C) on the frequency of nisin resistance in Listeria monocytogenes Scott A was evaluated. At 20 and 30 degrees C, resistance frequencies of around 1 in 10(5) were obtained regardless of salt concentration or pH. At 10 degrees C the frequency of nisin resistance dropped with decreasing pH and decreasing salt concentration. At pH 5.5 and 0.5% NaCl it became impossible to generate nisin-resistant isolates. Low salt (2 to 3.5%) appeared to play a protective role, allowing L. monocytogenes to better survive nisin at low temperature (10 degrees C).
引用
收藏
页码:420 / 423
页数:4
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