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Communication Dans Un Congrès Année : 2021

Drying dynamics in complex mixes of dairy proteins

Résumé

The dairy powders production represents a significant portion of the market related to dairy industry. Controlling powder nutritional properties has become crucial due to the increasing number of end-users. So far, this question has been addressed taking advantage of the empirical experience gained in the last decades. However, a full understanding of the physics governing the droplet-to-particle transition in industrial dryers, which would be decisive for the tight control of the process, is far from being achieved. To this purpose, the single droplet approach has been used to explore the drying dynamics at the lab scale in dairy simplified model systems, such as mixes of the two milk proteins: the whey proteins (WPI), i.e. globular colloids, and the casein micelles (NPC), i.e. deformable sponge-like structures. In this work, we focused on the evaporation in droplets of WPI/NPC suspensions with different protein concentration (cp) and composition (WPI%R). We investigated the formation of the skin at the air-liquid interface and we explored the paradigm linking protein physico-chemical properties to skin rheology and, consequently, to final droplet shape. A general overview of the process was carried out observing droplet profile evolution and evaluating the drying kinetics by mass measurements. A characterization of the skin organization at the colloidal scale was provided by interfacial rheology, using the oscillatory drop method, and scanning electron microscopy. Our outcomes revealed the separate role of WPI and NPC in skin formation. Under certain conditions, we observed WPI segregation on the external part of droplet surface, which significantly affected dry particle shape. Our systematic approach allowed to obtain a phase diagram able to predict dry particle morphology for a wide range of cp and WPI%R. To summarize, our results represent a potential tool for the control of dairy powder characteristics and contribute also to the understanding of the evaporation in polydisperse colloid systems.
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Dates et versions

hal-03194150 , version 1 (09-04-2021)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

  • HAL Id : hal-03194150 , version 1

Citer

Ming Yu, Cécile Le Floch-Fouéré, Francoise Boissel, L. Pauchard, Arnaud Saint-Jalmes, et al.. Drying dynamics in complex mixes of dairy proteins. AERC 2021 - Annual European Rheology Conference, Apr 2021, visioconference, Norway. ⟨hal-03194150⟩
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