High heating rates affect greatly the inactivation rate of Escherichia coli
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Huertas Baquero, Juan Pablo; Aznar Samper, María Aranzazu; Esnoz Nicuesa, Arturo; Fernández Escámez, Pablo Salvador; Iguaz Gainza, Asunción; [et al.]Knowledge Area
Tecnología de los AlimentosSponsors
This research was financially supported by the Ministry of Economy and Competitiveness of the Spanish Government and European Regional Development Fund (ERDF) through project AGL2013-48993-C2-1-RPublication date
2016-08Publisher
Frontiers MediaBibliographic Citation
HUERTAS BAQUERO, Juan Pablo et al. High heating rates affect greatly the inactivation rate of Escherichia coli. En: Frontiers in Microbiology, 2016, v. 7: 1256. ISSN: 1664-302XKeywords
Heat resistanceHeating rate
Escherichia coli
Heat exchanger
Thermoresistometer
Abstract
Heat resistance of microorganisms can be affected by different influencing factors. Although, the effect of heating rates has been scarcely explored by the scientific community, recent researches have unraveled its important effect on the thermal resistance of different species of vegetative bacteria. Typically heating rates described in the literature ranged from 1 to 20°C/min but the impact of much higher heating rates is unclear. The aim of this research was to explore the effect of different heating rates, such as those currently achieved in the heat exchangers used in the food industry, on the heat resistance of Escherichia coli. A pilot plant tubular heat exchanger and a thermoresistometer Mastia were used for this purpose. Results showed that fast heating rates had a deep impact on the thermal resistance of E. coli. Heating rates between 20 and 50°C/min were achieved in the heat exchanger, which were much slower than those around 20°C/s achieved in the thermoresistometer. In all ...
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