Validation of a mathematical model for predicting high pressure carbon dioxide inactivation kinetics of Escherichia coli spiked on fresh cut carrot |
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| Affiliation: | 1. Department of Industrial Engineering, University of Trento, via Mesiano 77, 38050 Trento, Italy;2. Department of Industrial Engineering, University of Padova, via Marzolo 9, 35131 Padova, Italy;1. Faculty of Science and Technology, Free University of Bozen/Bolzano, Piazza Università 5, 39100 Bolzano, Italy;2. Institute for Alpine Environments, EURAC, Viale Druso 1, 39100 Bolzano, Italy;1. Department of Chemical and Bioprocess Engineering, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Macul, Santiago, Chile;2. ASIS-UC Interdisciplinary Research Program on Tasty and Healthy Foods, UC, Santiago, Chile;3. Department of Chemical and Environmental Engineering, Universidad Técnica Federico Santa María, Av. Vicuña Mackenna 3939, San Joaquín, Santiago, Chile;1. Institute of Ecology, University of Innsbruck, Sternwartestraße 15, 6020 Innsbruck, Austria;2. Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy;3. Institute for Alpine Environment, European Academy Bolzano, Viale Druso 1, 39100 Bolzano, Italy;1. Artificial Intelligence Research Institute (IIIA-CSIC), Bellaterra, Spain;2. Goldsmiths College, University of London, London, UK;3. Institute de Recherche en Informatique de Toulouse (IRIT), Université Paul Sabatier, Toulouse, France;1. Department of Industrial Engineering, University of Trento, Via Sommarive, 9-38123 Povo, Trento, Italy;2. Department of Industrial Engineering, University of Padova, Via Marzolo, 9-35131 Padova, Italy;3. Venetian Institute of Molecular Medicine, Via Orus Giuseppe, 2-35129 Padova, Italy;4. Stem Cells and Regenerative Medicine Section, Developmental Biology and Cancer Program, Institute of Child Health, University College London, 30 Guilford Street, WC1N 1EH London, United Kingdom;5. Laboratory of Bio-inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy;6. Stem Cells and Regenerative Medicine Lab, Foundation Institute of Pediatric Research Città della Speranza, Corso Stati Uniti 4, 35136 Padova, Italy;7. Center for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo, TN, Italy;8. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom |
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| Abstract: | Inactivation kinetics of Escherichia coli spiked on fresh cut carrot and exposed to high pressure carbon dioxide (HPCD) treatment at several conditions of pressure (6, 8, 10, and 12 MPa) and two conditions of temperature (26 and 35 °C) were obtained as a function of the treatment time (up to 30 min).The Weibull model was applied to fit the inactivation kinetics and calculate δ and n model parameters for each pressure and temperature. The results demonstrated that the model was able to fit with good agreement the inactivation curves (high R2 and low RMSE values). In a second attempt, the model parameters were correlated with CO2 density resulting in a linear relationship. Validation of the proposed model was also performed at 6.6 and 10 MPa, 26 °C and at 8 MPa, 35 °C providing log reduction residual values (observed value–predicted value) lower than 0.50 and showing a good agreement between the experimental and the predicted inactivation data.The model proved to be a powerful tool to fit and predict, in the proposed operative range, the inactivation kinetics of E. coli spiked on fresh cut carrot treated by HPCD. The results demonstrated the potential of a relative simple correlative model for the interpretation of the inactivation data and for HPCD process design and optimization. |
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| Keywords: | High pressure carbon dioxide Weibull model Fresh cut carrot |
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