Comprendre les comportements des micelles de caséines dans des environnements variés, de leur équilibre minéral à leurs propriétés colloïdales et fonctionnelles : émulsion et coagulation présure

Abstract : Caseins micelles, composed of caseins, minerals and water, are under dynamic equilibria, they constantly exchange materials with their surrounding environments. In addition, casein micelles possess valuable functionalities in regards to the formation of dairy products, such as the ability to stabilize emulsions or to form rennet gels. Environmental changes, such as variations in pH, additions of salts or chelating agents, affect the casein micelles equilibria and lead to modifications in their compositional and colloidal properties. Such changes also modify their functional properties, although this aspect is poorly described in the literature. This project aimed to understand the relationships that link the environmental modifications, the mineral balance, the colloidal and functional properties of the casein micelles. The impact of five modifying factors (pH, Na3Cit, NaCl, CaCl2, MgCl2) of the casein micelles were studied and the focus was placed on emulsion and rennet coagulation fuThe former only induce the swelling of casein micelles while the latter led to their disruption into smaller aggregates. NaCl had no impact on the micellar mineral content but also caused the release of small aggregates, as revealed by electronic microscopy and small angle X-ray scattering analyses. The decisive role of micellar calcium phosphate on the functionalities was confirmed and this study highlighted the importance of monitoring the release of small aggregates, as they strongly affected emulsions stability and gels firmness. CaCl2 and MgCl2 additions slightly increased the mineral c
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Fanny Lazzaro. Comprendre les comportements des micelles de caséines dans des environnements variés, de leur équilibre minéral à leurs propriétés colloïdales et fonctionnelles : émulsion et coagulation présure. Alimentation et Nutrition. Agrocampus Ouest, 2017. Français. ⟨NNT : 2017NSARB301⟩. ⟨tel-01814679⟩

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