Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/54428
Title: Adaptation of O157:H7 and non-O157 Escherichia coli strains in orange juice and subsequent resistance to UV-C radiation
Keywords: Foodborne pathogens
Fruit juices
Emerging technologies
Acid adaptation
Irradiation
Issue Date: Mar-2022
Publisher: Elsevier
Citation: OTEIZA, J. M. et al. Adaptation of O157:H7 and non-O157 Escherichia coli strains in orange juice and subsequent resistance to UV-C radiation. LWT, [S.l.], v. 157, Mar. 2022.
Abstract: This study assessed the acid-adaptation of pathogenic and non-pathogenic strains of Escherichia coli in orange juice and the microbial resistance to the subsequent UV-C radiation treatment. Nine Shiga toxin-producing E. coli (STEC) and one strain of a non-pathogenic surrogate E. coli were used in this study. Each E. coli strain was inoculated in orange juice, following pre-exposure during 0, 1, 2, and 3 h at 10 °C. Then, the inoculated juices with the ten different strains separately were exposed to 0 and 2 J/cm2 of UV-C radiation. The D value (i.e., the UV-C dose in J/cm2 required to cause a one-log reduction in the target microorganism) was calculated. Further, the resistance coefficient [RC; i.e., the ratio between the D-values for the control condition (D0h) and each pre-exposure tested time (D1h, D2h, D3h)] were determined. The results indicated that the resistance of E. coli was influenced by the pre-exposure period in the orange juice, with increased resistance to UV-C observed for periods >2 h. Furthermore, the sensitivity of cells to subsequent UV-C treatment was found to be strain-dependent. The results may allow the development of more reliable UV-C radiation processes for orange juice processing aiming the inactivation of pathogenic E. coli.
URI: https://www.sciencedirect.com/science/article/pii/S0023643822000421
http://repositorio.ufla.br/jspui/handle/1/54428
Appears in Collections:DCA - Artigos publicados em periódicos

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