Mise en oeuvre de Lactococcus Lactis subsp. Lactis Biovar. Diacetylactis et de Leuconostoc Mesenteroides subsp. Cremoris en cultures pures et en co-cultures : études cinétiques et suivi en ligne de l'influence de l'acide citrique et du pH sur le comportement métabolique

Abstract : aThe aim of this thesis is to analyse, to understand and to quantify the influence of operating conditions on metabolic behavior, on growth kinetics and on aromatic compounds production kinetics of two mesophilic lactic acid bacteria : Lactococcus lactis subsp. Lactis biovar. Diacetylactis and Leuconostoc mesentieroides subsp. Cremoris. The first part of this work deals with the perfecting and the validation of original analytical methods used for on-line and out-line monitoring of about tend different compounds. This part leads to the utilization of a membrane gas sensor for the on-line volatile compound analysis and of a steile liquid auto-sampler for the on-line detection of other compounds. In a second part, studies in pure cultures led to show and to quantify pH influence on kinetics and metabolisms of bacteria and to specify the importance of the role of citric acid in general metabolism of the two studied species. The third part deals with the use of the two types of bacteria in mixed cultures at different pH values and analyse the kinetic results
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_1993_STIEN_G.pdf
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https://hal.univ-lorraine.fr/tel-01752290
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Submitted on : Thursday, March 29, 2018 - 1:40:30 PM
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Gilles Stien. Mise en oeuvre de Lactococcus Lactis subsp. Lactis Biovar. Diacetylactis et de Leuconostoc Mesenteroides subsp. Cremoris en cultures pures et en co-cultures : études cinétiques et suivi en ligne de l'influence de l'acide citrique et du pH sur le comportement métabolique. Autre. Institut National Polytechnique de Lorraine, 1993. Français. ⟨NNT : 1993INPL107N⟩. ⟨tel-01752290⟩

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