Purification of beta casein from milk

A - Human Necessities – 23 – C

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A23C 9/142 (2006.01) A23C 19/05 (2006.01) A23J 1/20 (2006.01)

Patent

CA 2629427

A method is provided for obtaining .beta.-casein from skim milk. Purification of .beta.-casein from milk is achieved through a process of microfiltration using cross-flow polymeric microfiltration membranes. Cooling of the milk prior to microfiltration results in improved separation of .beta.-casein from the other milk serum proteins. Further filtration and demineralization of the microfiltered permeate results in enrichment of the fraction containing soluble .beta.-casein. An integrated scheme that allows a dairy plant to continuously separate and purify .beta.-casein is provided. Also provided is a method for obtaining cheese with improved meltability and reduced bitterness.

L'invention concerne un procédé d'obtention de .beta.-caséine depuis du lait écrémé. La purification de .beta.-caséine depuis du lait s'obtient au moyen d'un procédé de microfiltration qui fait appel à des membranes polymères de microfiltration à courant transversal. Refroidir le lait avant sa microfiltration entraîne une meilleure séparation de la .beta.-caséine des autres protéines du lactosérum. Une nouvelle microfiltration et la déminéralisation du perméat microfiltré entraînent un enrichissement de la fraction contenant une .beta.-caséine soluble. L'invention concerne également un plan intégré qui permet à une laiterie de séparer et de purifier la .beta.-caséine de manière continue. Elle concerne en outre un procédé permettant d'obtenir du fromage ayant une meilleure capacité de fondre et moins d'amertume.

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