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Microbial quality of irrigation water used in leafy green production in Southern Brazil and its relationship with produce safety

机译：巴西南部多叶绿色生产中使用的灌溉水的微生物质量及其与产品安全性的关系

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摘要

Irrigation water has been recognized as an important microbial risk factor for fruits and vegetables in many production areas, but there is still a lack of information about how the microbiological quality of different irrigation water sources and climatic conditions influence the safety of vegetables produced in Brazil. This study evaluated the distribution of generic E coli and the prevalence of E coli 0157:H7 in two different water sources (ponds and streams bordering farmlands and urban areas) used for irrigation and on commercially produced lettuces in Southern Brazil. We also evaluated the effect of agricultural factors and meteorological conditions in the potential contamination of water and produce samples. A longitudinal study was conducted on four farms during a year (July 2014 to August 2015). The results showed generic E coli prevalence of 84.8% and 38.3% in irrigation water samples and on lettuces, respectively, indicating irrigation water as an important source of contamination of lettuces. No significant differences were detected in the counts of E. coli between the two different surface water sources. The climatic conditions, particularly rainfall and environmental temperature, have influenced the high concentration of E. coli. The highest loads of E. coli in irrigation water and on lettuces were found during the warmest time of the year. E. coli 0157:H7 was detected by qualitative polymerase chain reaction (qPCR) in 13 water samples but only 4 were confirmed by isolation in culture media.
机译：在许多生产地区，灌溉水已被认为是水果和蔬菜的重要微生物危险因素，但仍然缺乏有关不同灌溉水源的微生物质量和气候条件如何影响巴西生产的蔬菜安全性的信息。这项研究评估了巴西南部用于灌溉和商业生产的生菜的两种不同水源（与农田和城市地区接壤的池塘和溪流）中普通大肠杆菌的分布和大肠杆菌0157：H7的流行情况。我们还评估了农业因素和气象条件对水的潜在污染的影响，并产生了样品。在一年中（2014年7月至2015年8月）对四个农场进行了纵向研究。结果表明，灌溉用水样品和生菜中的普通大肠杆菌感染率分别为84.8％和38.3％，表明灌溉水是生菜污染的重要来源。两种不同的地表水源之间的大肠杆菌计数没有发现显着差异。气候条件，特别是降雨和环境温度，已经影响了大肠杆菌的高浓度。在一年中最温暖的时候，发现灌溉水中和生菜中的大肠杆菌含量最高。通过定性聚合酶链反应（qPCR）在13个水样品中检测到了大肠杆菌0157：H7，但通过在培养基中分离仅确认了4个。

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  • 来源
    《Food microbiology》 |2017年第8期|105-113|共9页
  • 作者

    Luana Tombini Decol; Letícia Sopeña Casarin; Claudia Titze Hessel; Ana Carolina Fosch Batista; Ana Allende; Eduardo Cesar Tondo;

  • 作者单位

    Laboratório de Microbiologia e Controle de Alimentos, Institute de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul (ICTA/ UFRGS), Av. Bento Gonfalves 9.500, pridio 43212, Campos do Vale, Agronomia, CEP: 91501-970, Porto Alegre, RS, Brazil;

    Laboratório de Microbiologia e Controle de Alimentos, Institute de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul (ICTA/ UFRGS), Av. Bento Gonfalves 9.500, pridio 43212, Campos do Vale, Agronomia, CEP: 91501-970, Porto Alegre, RS, Brazil;

    Laboratório de Microbiologia e Controle de Alimentos, Institute de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul (ICTA/ UFRGS), Av. Bento Gonfalves 9.500, pridio 43212, Campos do Vale, Agronomia, CEP: 91501-970, Porto Alegre, RS, Brazil;

    Laboratório de Microbiologia e Controle de Alimentos, Institute de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul (ICTA/ UFRGS), Av. Bento Gonfalves 9.500, pridio 43212, Campos do Vale, Agronomia, CEP: 91501-970, Porto Alegre, RS, Brazil;

    Research Group on Quality, Safely and Bioactivity of Plant Foods, Department of Food Science and Technology, CEBAS-CSIC, Campus Universitario de Espinardo, 30100, Murcia, Spain;

    Laboratório de Microbiologia e Controle de Alimentos, Institute de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul (ICTA/ UFRGS), Av. Bento Gonfalves 9.500, pridio 43212, Campos do Vale, Agronomia, CEP: 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

    Irrigation water; Fresh produce; Indicator microorganisms; Foodborne pathogens; Primary production;

    机译：灌溉水;新鲜农产品;指示微生物;食源性病原体;初级生产;

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