Effect of nanovesicle-encapsulated nisin on growth of Listeria monocytogenes in milk

被引:88
|
作者
Malheiros, Patricia da Silva [1 ]
Daroit, Daniel Joner [1 ]
da Silveira, Nadya Pesce [2 ]
Brandelli, Adriano [1 ]
机构
[1] Univ Fed Rio Grande do Sul, ICTA, Dept Ciencia Alimentos, Lab Bioquim & Microbiol Aplicada, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Inst Quim, Lab Instrumentacao & Dinam Mol, BR-91501970 Porto Alegre, RS, Brazil
关键词
Liposome; Encapsulation; Nisin; Listeria monocytogenes; Milk; LIPOSOMES; PRESERVATION; ACID; INHIBITION; STABILITY; LYSOZYME; EFFICACY; CHEESE; SIZE; FAT;
D O I
10.1016/j.fm.2009.09.013
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
commercial nisin was encapsulated in nanovesicles (mean diameter 140 nm) prepared from partially purified soy lecithin. Nisin-loaded liposomes and unencapsulated (free) nisin were initially tested in BHI medium and skim milk inoculated with Listeria monocytogenes and incubated for 48 h at 30 degrees C. At such abuse temperature conditions, free nisin showed better inhibitory than the liposomal counterparts. Subsequently, the effect of encapsulated or free nisin was evaluated in combination with refrigeration (7 +/- 1 degrees C) in both whole (3.25% fat) and skim (0% fat) milk for up to 14 day. A decrease of 3-4 log cycles in L. monocytogenes counts was observed for free and encapsulated nisin at 0.5 mg/ml concentration. Liposome encapsulation of antimicrobial peptides may be important to overcome stability issues and interaction with food components. The utilization of nanovesicle-encapsulated nisin in combination with low temperatures appeared to be effective to control L monocytogenes in milk, emphasizing the importance of hurdle technology to assure food safety. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:175 / 178
页数:4
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