Inactivation modeling of microorganisms using organic chlorine and acetic acid solutions and estimation of growth kinetics of adhered Enterobacteriaceae to lettuce (Lactuca sativa L.)

This study was aimed to evaluate the efficiency of the organic chlorine and acetic acid solutions on the inactivation of adhered cells of Escherichia coli, Cronobacter sakazakii and Klebsiella pneumoniae to lettuce. Besides, the growth and inactivation of K. pneumoniae adhered to lettuce was modeled...

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Veröffentlicht in:Journal of food safety Jg. 40; H. 3
Hauptverfasser: Alves, Roberta B. T., Mousavi Khaneghah, Amin, Antunes, Maria A., Silva, Beatriz S., Sant'Ana, Anderson S., Peña, Wilmer E. L., Andrade, Nélio J.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Hoboken, USA John Wiley & Sons, Inc 01.06.2020
Blackwell Publishers Inc
Schlagworte:
Acetic acid
Acids
Chlorine
Cronobacter sakazakii
Deactivation
E coli
Escherichia coli
Food safety
Growth kinetics
growth models
Inactivation
Klebsiella
Klebsiella pneumoniae
Lactuca sativa
leaves
lettuce
Microorganisms
Residual chlorine
Sanitizers
Sodium chloride
Vegetables
ISSN:0149-6085, 1745-4565
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Zusammenfassung:This study was aimed to evaluate the efficiency of the organic chlorine and acetic acid solutions on the inactivation of adhered cells of Escherichia coli, Cronobacter sakazakii and Klebsiella pneumoniae to lettuce. Besides, the growth and inactivation of K. pneumoniae adhered to lettuce was modeled. According to the findings, the use of chlorine solution (170 mg/ml of total residual chlorine) caused reductions of 1.8, 1.9, and 1.9 log for E. coli, C. sakazakii, and K pneumoniae, respectively, were recorded. In this regard, the organic chloramine was more effective in controlling the adhered microorganisms while compared with 1.5% acetic acid solution, while the addition of 0.5% sodium chloride to 1.5% acetic acid solution increased microbial inactivation. K. pneumoniae RC‐34 inactivation was characterized by the presence of two sub‐populations with different resistances against the proposed sanitizers. Moreover, the growth kinetic parameters of K. pneumoniae RC‐34 adhered to lettuce leaves were very similar to that reported in the literature for nonadhered microorganisms. The predictive data generated can be valuable to assess the growth and inactivation of produce adhered microorganisms in leafy produce.
Bibliographie:Funding information
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Conselho Nacional de Desenvolvimento Científico e Tecnológico, Grant/Award Numbers: #305804/2017‐0, #302763/2014‐7
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ISSN:0149-6085
1745-4565
DOI:10.1111/jfs.12790