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The purpose of this study is to evaluate the hygienic-sanitary quality of vegetables and irrigation water and assess the effectiveness of lemon juice and vinegar in reducing E. coli strains inoculated on lettuce. One hundred and forty samples of vegetables and 45 samples of irrigation water were investigated for thermotolerant coliforms and Salmonella spp. In order to verify the effectiveness of natural household sanitizers in reducing E. coli in inoculated lettuce, four treatment solutions were tested: fresh lemon juice, alcohol vinegar, lemon juice-vinegar mixture, and lemon juice-vinegar-water mixture. The microbiological analysis revealed high rates of contamination by thermotolerant coliforms and identified the presence of E. coli in 32% of the tested vegetable samples and 56% of the water samples. While no significant statistical difference (p < 0, 05) was identified in the tested solutions, the treatment with a combination of lemon juice and vinegar resulted in the highest Decimal Reductions (DR) of E. coli O157: H7 while the treatment with vinegar alone was the most effective against the indigenous E. coli strain O objetivo desse estudo foi avaliar a qualidade higiênico-sanitária de hortaliças e água de irrigação e a eficácia do uso de suco de limão e vinagre na redução de cepas de E. coli inoculadas em alface. Cento e quarenta amostras de hortaliças e 45 amostras da água de irrigação foram coletadas e investigadas para a presença de coliformes termotolerantes e Salmonella spp. Para verificar a eficácia de sanitizantes naturais de uso doméstico na redução de E. coli na alface inoculada, quatro tratamentos foram testados: suco de limão fresco, vinagre de álcool, mistura suco de limão-vinagre e mistura suco de limão-vinagre-água. A análise microbiológica revelou altas taxas de contaminação por coliformes termotolerantes e identificou a presença de E. coli em 32% das amostras das hortaliças investigadas e em 56% das amostras de água. Embora nenhuma diferença estatística significativa (p < 0, 05) tenha sido identificada entre as soluções testadas, o tratamento com a combinação de suco de limão e vinagre forneceu a mais alta Redução Decimal (RD) para E. coli O157: H7, enquanto o uso de vinagre apenas foi o tratamento mais efetivo contra a cepa E. coli indígen

food science and technology

Hygienic-sanitary quality of vegetables and evaluation of treatments for the elimination of indigenous E. coli and E. coli O157:H7 from the surface of leaves of lettuce (Lactuca sativa L.)