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Insolubility of milk powder products — A minireview

Insolubilité des poudres laitières — une mini-revue

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Dairy Science & Technology

Abstract

In this paper, the formation of insolubility in milk powder is described, and the factors affecting the reaction are discussed. The zone in which casein proteins are most sensitive to heat is in the moisture range that occurs during spray drying. The rate of reaction has been determined and shows differences of orders of magnitude with the moisture content. The effect of chemical reagents on the extent of reaction gives insights into the chemical bonds that inhibit hydration. Information on the drying of casein products and individual proteins is used to infer that the withdrawal of moisture from casein proteins and the concentration of divalent cations during drying lead to alterations in the conformation of proteins that have an adverse effect on their rehydration during reconstitution. Further work to fully characterise these effects is required.

Résumé

L’apparition de l’insolubilité des poudres laitières est décrite et les facteurs affectant cette réaction sont discutés dans cet article. La zone dans laquelle les caséines sont les plus sensibles à la chaleur se situe dans la gamme d’humidité intervenant au cours du procédé de séchage par atomisation. La vitesse de réaction a été déterminée et montre des différences d’ordres de grandeur des taux d’humidité. L’effet des réactifs chimiques sur l’étendue de la réaction donne un aperçu des liaisons chimiques qui inhibent l’hydratation. On peut déduire de l’information obtenue sur le séchage des caséines et des protéines individuelles que l’élimination de l’humidité des caséines et la concentration en cations divalents au cours du séchage conduisent à des modifications de la conformation des protéines qui peuvent avoir des effets négatifs sur leur réhydratation au cours de la reconstitution des poudres. Un travail ultérieur est nécessaire pour caractériser complètement ces effets.

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  1. Fonterra Co-operative Group Ltd., Fonterra Research Centre, Private Bag 11 029, Palmerston North, New Zealand

    Alan J. Baldwin

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  1. Alan J. Baldwin
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Correspondence to Alan J. Baldwin.

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Baldwin, A.J. Insolubility of milk powder products — A minireview. Dairy Sci. Technol. 90, 169–179 (2010). https://doi.org/10.1051/dst/2009056

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