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

机译：纳米囊泡乳链菌肽对牛奶中李斯特菌生长的影响

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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 ℃. 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 ℃) 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.
机译：商业乳链菌肽被封装在由部分纯化的大豆卵磷脂制备的纳米囊泡（平均直径140 nm）中。最初在BHI培养基和脱脂乳中接种单株李斯特菌，然后测试乳链菌素负载的脂质体和未封装的（游离）乳链菌肽，然后在30℃下孵育48小时。在这种滥用温度条件下，游离乳链菌肽比脂质体对应物显示出更好的抑制作用。随后，在全脂牛奶（3.25％脂肪）和脱脂牛奶（0％脂肪）中长达14天，结合冷冻（7±1℃）评估封装的或游离乳链菌肽的效果。对于浓度为0.5 mg / ml的游离和胶囊化乳链菌肽，单核细胞增生李斯特菌计数减少了3-4个对数周期。抗菌肽的脂质体封装对于克服稳定性问题和与食品成分的相互作用可能很重要。纳米囊泡乳链菌肽与低温的结合使用似乎可以有效地控制牛奶中的单核细胞增生李斯特氏菌，强调了跨栏技术对确保食品安全的重要性。

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  • 来源
    《Food microbiology》 |2010年第1期|175-178|共4页
  • 作者

    Patricia da Silva Malheiros; Daniel Joner Daroit; Nadya Pesce da Silveira; Adriano Brandelli;

  • 作者单位

    Laboratorio de Bioquimica e Microbiologia Aplicada, Departamento de Ciencia de Alimentos, ICTA, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970 Porto Alegre, RS, Brazil;

    Laboratorio de Bioquimica e Microbiologia Aplicada, Departamento de Ciencia de Alimentos, ICTA, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970 Porto Alegre, RS, Brazil;

    Laboratorio de Instrumentacao e Dinamica Molecular, Instituto de Quimica, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970 Porto Alegre, RS, Brazil;

    Laboratorio de Bioquimica e Microbiologia Aplicada, Departamento de Ciencia de Alimentos, ICTA, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970 Porto Alegre, RS, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    liposome; encapsulation; nisin; listeria monocytogenes; milk;

    机译：脂质体封装乳链菌肽李斯特菌;牛奶;

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