Conservation sous atmosphère modifiée de fromages comportant une flore de surface : dynamique de l'activité respiratoire et des transferts au travers des matériaux d'emballage

Abstract : The scope of this work was to optimise a modified atmosphere package adapted to the requirements of surface-flora cheese so was to moniter the gas equilibrium. The first part of the study focused on unwrapped cheese under various environmental conditions. These conditions were shown to modify the «morphology» (aspect) and physiology (respiration) of the flora. The most suitable conditions (P02, PC02, RH, température) were determined to optimise the preservation of the cheese with Penicillium surface-flora and associated micro-organisms. Five parameters were monitored, establishing their impact on the respiration of Penicillium. Relation to PO2 followed the Michealis-Menten law, whilst the Arrhenius equation translated it' s temperature dependence. ln the second part of the study, a theoretical model of the gas transfer (02 and CO2) was constructed, taking into account the two major phenomena implied: respiration and gas transfer through the package. The validity of the model was checked for cheeses with the two types of flora, using 19 packages with various gas permeability properties. Non withstanding the complexity and variability of a cheese and the characteristics of packages, this model has a 1 good prediction capacity of the partial pressures in the headspace. This modem approach enables to select the best package for surface- flora cheese using scientific criteria. It is a tool that will facilitate communication between dairy factories and packaging suppliers.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_1999_ROGER_B.pdf
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https://hal.univ-lorraine.fr/tel-01750691
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Submitted on : Thursday, March 29, 2018 - 12:52:43 PM
Last modification on : Monday, April 16, 2018 - 10:40:56 AM

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Bruno Roger. Conservation sous atmosphère modifiée de fromages comportant une flore de surface : dynamique de l'activité respiratoire et des transferts au travers des matériaux d'emballage. Sciences agricoles. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL078N⟩. ⟨tel-01750691⟩

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