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Poster De Conférence Année : 2015

Evolution of functional properties of native phospho casein (NPC) during storage

Résumé

Rehydration of powder is an operation commonly encountered in the dairy industry. Despite their importance, few studies concern influence of ageing on rehydration kinetics of Milk Protein Concentrate (MPC). To address this issue, controlled ageing conditions have been applied to a particular MPC powder: a Native Phospho Casein powder (NPC) and impacts on rehydration ability have been reported. NPC powder was obtained by spray drying a concentrate which contains a higher content of casein (90%) compared to traditional MPC (80%). Three characteristic times (penetration, fragmentation and total rehydration times) based on different tests have been determined to understand and quantify effect of ageing on rehydration kinetic steps. Colorimetric changes (evolution of browning index) as well as solubility index evolutions with ageing have also been reported. As expected, it is shown that the three characteristic times and browning index increase with duration and temperature of storage while solubility index decreases. However, relaxation time evolution is in two stages, it declines in the first period and rises thereafter with storage time. It is assumed that the skin around the particles becomes more porous at the beginning, facilitating penetration of water and becomes denser in the second step due to linkage between micelles caseins, delaying the penetration of water. The higher the temperature of storage, the faster the densification of skin. It is shown that chief curves exist between rehydration time increases and the other indicators (fragmentation times, browning index, solubility change). These results suggest that indicators (such as fragmentation time, relaxation time, browning index and solubility loss) could be used to assess ageing state (avoiding tedious manipulation). These rapid tests could be carried out to predict the required rehydration time and setting adequate process parameters.
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Dates et versions

hal-01454534 , version 1 (02-02-2017)

Identifiants

  • HAL Id : hal-01454534 , version 1
  • PRODINRA : 326819

Citer

Sarah Nasser, Anne Moreau, Alain Hédoux, Romain Jeantet, Guillaume Delaplace. Evolution of functional properties of native phospho casein (NPC) during storage. IDF World Dairy Summit 2015, Sep 2015, Vilnius, Lithuania. , 2015. ⟨hal-01454534⟩
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