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首页> 外文期刊>Food microbiology >Light based technologies for microbial inactivation of liquids, bead surfaces and powdered infant formula
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Light based technologies for microbial inactivation of liquids, bead surfaces and powdered infant formula

机译：用于液体，微珠表面和婴儿配方奶粉的微生物灭活的基于光的技术

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摘要

This study evaluates the potential of continuous wave Ultraviolet C light (UV-C) and broad-spectrum intense pulsed light (in this study referred to as High Intensity Light Pulses, HILP) for the inactivation of pathogens of public concern in powdered infant formula (PIF) producers. To achieve this goal a sequential set of experiments were performed, firstly in clear liquid media, secondly on the surface of spherical beads under agitation and, finally in PIF. L innocua was the most sensitive microorganism to both technologies under all conditions studied with reductions exceeding 4 log_(10) cycles in PIF. In the clear liquid medium, the maximum tolerance to light was observed for C. sakazakii against UV-C light and for B. subtilis spores against HILP, with a fluence of approximately 17 mJ/cm~2 required for a 1 login cycle inactivation (D value) of each species. In PIF it was possible to inactivate >99% of the vegetative cell populations by HILP with a fluence of 199 mJ/cm~2 and of B. subtilis spores by doubling the fluence. By contrast, for UV-C treatments a fluence of 2853 mJ/cm~2 was needed for 99.9% reduction of C. sakazakii, which was the most light-resistant microorganism to UV-C. Results here obtained clearly show the potential for light-based interventions to improve PIF microbiological safety.
机译：这项研究评估了连续波紫外线C光（UV-C）和广谱强脉冲光（在本研究中称为高强度光脉冲HILP）灭活婴儿配方奶粉中公共关注的病原体的潜力（ PIF）生产者。为了实现此目标，先进行了一系列实验，首先是在透明的液体介质中，其次是在搅拌下在球形微珠的表面上进行，最后是在PIF中进行。在所有研究的条件下，无毒金枪鱼对这两种技术最敏感，在PIF中减少超过4 log_（10）个循环。在清澈的液体介质中，观察到阪崎肠杆菌对UV-C光的最大耐受性以及枯草芽孢杆菌孢子对HILP的最大耐受性，1次登录循环失活所需的通量约为17 mJ / cm〜2 D值）。在PIF中，通过HILP可使通量为199 mJ / cm〜2的营养细胞群体失活> 99％，而通过使通量倍增而使枯草芽孢杆菌孢子失活。相比之下，对于UV-C处理，需要2853 mJ / cm〜2的通量才能使阪崎肠杆菌的减少99.9％，而阪崎肠杆菌是对UV-C最耐光的微生物。此处获得的结果清楚地表明了基于光的干预措施可能会提高PIF微生物安全性。

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  • 来源
    《Food microbiology》 |2017年第10期|49-57|共9页
  • 作者

    Cristina Arroyo; Anna Dorozko; Edurne Gaston; Michael OSullivan; Paul Whyte; James G. Lyng;

  • 作者单位

    UCD School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland;

    UCD School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland;

    IRIS - Innovacid i Recerca Industrial i Sostenible, Avda. Carl Friedrich Gauss 11, 08860 Castelldefels, Spain;

    UCD School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland;

    UCD School of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland;

    UCD School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland;

  • 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

    Infant formula; Powder; Ultraviolet-light; Pulsed light; Cronobacter; spores;

    机译：婴幼儿配方奶粉;粉末;紫外光线;脉冲光;克罗诺杆菌孢子;

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