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• W2071093929 abstract "Abstract High‐pressure, high‐temperature (HPHT) processing is effective for microbial spore inactivation using mild preheating, followed by rapid volumetric compression heating and cooling on pressure release, enabling much shorter processing times than conventional thermal processing for many food products. A computational thermal fluid dynamic (CTFD) model has been developed to model all processing steps, including the vertical pressure vessel, an internal polymeric carrier, and food packages in an axis‐symmetric geometry. Heat transfer and fluid dynamic equations were coupled to four selected kinetic models for the inactivation of C. botulinum ; the traditional first‐order kinetic model, the Weibull model, an nth‐order model, and a combined discrete log‐linear n th‐order model. The models were solved to compare the resulting microbial inactivation distributions. The initial temperature of the system was set to 90°C and pressure was selected at 600 MPa, holding for 220 s, with a target temperature of 121°C. A representation of the extent of microbial inactivation throughout all processing steps was obtained for each microbial model. Comparison of the models showed that the conventional thermal processing kinetics (not accounting for pressure) required shorter holding times to achieve a 12D reduction of C. botulinum spores than the other models. The temperature distribution inside the vessel resulted in a more uniform inactivation distribution when using a Weibull or an n th‐order kinetics model than when using log‐linear kinetics. The CTFD platform could illustrate the inactivation extent and uniformity provided by the microbial models. The platform is expected to be useful to evaluate models fitted into new C. botulinum inactivation data at varying conditions of pressure and temperature, as an aid for regulatory filing of the technology as well as in process and equipment design. © 2009 American Institute of Chemical Engineers Biotechnol. Prog., 2009" @default.
• W2071093929 created "2016-06-24" @default.
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• W2071093929 date "2009-01-01" @default.
• W2071093929 modified "2023-10-14" @default.
• W2071093929 title "<i>C. botulinum</i>inactivation kinetics implemented in a computational model of a high-pressure sterilization process" @default.
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• W2071093929 doi "https://doi.org/10.1002/btpr.116" @default.
• W2071093929 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19197999" @default.
• W2071093929 hasPublicationYear "2009" @default.
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