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Efficacy of sodium hypochlorite and peracetic acid against Aspergillus nomius in Brazil nuts

机译：次氯酸钠和过乙酸对巴西坚果曲霉Nomius的疗效

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摘要

The objective of this work was to assess the efficacy of sodium hypochlorite and peracetic acid for sanitization of Brazil nuts. To evaluate the natural microbiota of the nuts, the total bacteria and fungi as well as the Aspergillus section Flavi were counted. The moisture, water activity and the presence of aflatoxins was quantified. The response surface method was used to determine the influence of exposure time and sanitizers concentration on the reduction of Aspergillus nomius inoculated on the nuts. Microbiological, sensory and quantification analyzes of aflatoxins were performed under optimum conditions The evaluation of the initial contamination of the nuts, despite presenting high microbiological contamination, humidity and water activity, was not detected aflatoxins in any samples. In artificially inoculated samples, the response surface and the desirability function were obtained to determine the optimal point of use for each sanitizer. The nuts had high microbiological contamination, moisture content and water activity. Aflatoxins were not detected in any samples. The response surface and desirability function indicated the optimal sanitization conditions were 250 mg/L and 8.5 min and 140 mg/L and 15 min for sodium hypochlorite and peracetic acid, respectively. Reductions greater than 2 log CFU/g were obtained with sodium hypochlorite and of 1 log CFU/g for peracetic acid. In the tests performed with new Brazil nuts samples under the optimized conditions, reductions of less than 2 log CFU/g were obtained. Aflatoxin B1 was detected in one untreated sample (1.51 μg/kg), one sample treated with sodium hypochlorite (0.60 μg/kg) and two samples treated with peracetic acid (0.64 and 0.72 μg/kg). Demonstrating that the sanitizers in the concentrations used had no action on aflatoxins, despite being efficient for fungal control. The treatments did not cause an unacceptable sensorial impact on the samples.
机译：这项工作的目的是评估次氯酸钠和过乙酸对巴西坚果的待遇的疗效。为了评估坚果的天然微生物，总细菌和真菌以及曲霉部分Flavi被计算。量化了水分，水活动和黄曲霉毒素的存在。响应表面方法用于确定暴露时间和消毒剂浓度对接种在螺母上的曲霉菌的减少的影响。在最佳条件下进行微生物，感官和定量分析，在最佳条件下进行螺母的初始污染的评价，尽管呈现高微生物污染，湿度和水活动，但在任何样品中都没有检测到过曲霉素。在人工接种的样品中，获得响应表面和期望功能以确定每个清水仪的最佳使用点。坚果具有高微生物污染，水分含量和水活动。在任何样品中未检测到黄曲霉毒素。响应表面和期望功能表明，最佳消毒条件为250mg / L和8.5分钟，次氯酸钠和过乙酸的140mg / L和15分钟。用次氯酸钠和1种LOG CFU / g获得大于2个LOG CFU / g的降低，得到过乙酸。在用新的巴西坚果样品在优化条件下进行的测试中，获得少于2个LOG CFU / g的降低。在一个未处理的样品（1.51μg/ kg）中检测到黄曲霉毒素B1，用次氯酸钠（0.60μg/ kg）处理的一种样品，并用过乙酸处理的两个样品（0.64和0.72μg/ kg）。尽管对真菌控制有效，但所用浓度的消毒剂在嗜浓度下没有作用于黄曲霉毒素。治疗没有对样品产生不可接受的感觉影响。

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  • 来源
    《Food microbiology》 |2020年第9期|103449.1-103449.8|共8页
  • 作者

    M.S.S. Ribeiro; O. Freitas-Silva; I.M. Castro; A. Teixeira; S.H. Marques-da-Silva; A.C.S. Sales-Moraes; L.F. Abreu; C.L. Sousa;

  • 作者单位

    Federal University of Para Graduate Program in Food Science and Technology (UFPA/PPGCTA) Rua Augusta Correa 01 66.075.110 Campus Untversitario Do Guama Belem Brazil;

    Embrapa Food Agroindustry Av Das Americas 29501 23020-470 Rio de Janeiro Brazil;

    Embrapa Food Agroindustry Av Das Americas 29501 23020-470 Rio de Janeiro Brazil;

    Embrapa Food Agroindustry Av Das Americas 29501 23020-470 Rio de Janeiro Brazil;

    Evandro Chagas Institute Bacteriology and Mycology Section Mycology Laboratory Rodovia BR-316 KM 7 S/N 67030-000 Ananindeua Brazil;

    Federal University of Para Graduate Program in Food Science and Technology (UFPA/PPGCTA) Rua Augusta Correa 01 66.075.110 Campus Untversitario Do Guama Belem Brazil;

    Embrapa Eastern Amazon Trav. Eneas Pinheiro S/N 66095-903 Postal Code 48 Belem Brazil;

    Federal University of Para Graduate Program in Food Science and Technology (UFPA/PPGCTA) Rua Augusta Correa 01 66.075.110 Campus Untversitario Do Guama Belem 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

    Contamination; Nuts; Sanitizers;

    机译：污染;坚果;消毒剂;

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