Purification of blood clotting proteins

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 1/26 (2006.01) C07K 14/75 (2006.01)

Patent

CA 2340106

A method of separating a blood clotting protein from a mixture of blood clotting protein and at least one contaminant, the method comprising: (a) placing a blood clotting protein and contaminant mixture in a first solvent stream, the first solvent stream being separated from a second solvent stream by a first electrophoretic membrane; (b) selecting a buffer for the first solvent stream being a pH greater than the isoelectric point of the blood clotting protein; (c) applying an electric potential between the first and second solvent streams causing movement of at least some of the contaminants through the membrane into the second solvent stream while the blood clotting protein is substantially retained in the first solvent stream, or if entering the membrane, being substantially prevented from entering the second solvent stream; (d) optionally periodically stopping and reversing the electric potential to cause movement of any blood clotting protein having entered the membrane to move back into the first solvent stream, wherein substantially not causing any contaminants that have entered the second solvent stream to re- enter first solvent stream; and (e) maintaining step (c) until the first solvent stream contains the desired purity of blood clotting protein substantially mimicking the characteristics of natural blood clotting protein.

L'invention concerne une technique qui permet de séparer une protéine intervenant dans la coagulation sanguine d'un mélange constitué de ladite protéine et d'au moins un contaminant. La technique comprend les étapes suivantes: a) on introduit un mélange constitué de la protéine de la coagulation sanguine et d'un contaminant dans un premier flux de solvant, séparé d'un second flux de solvant par une première membrane électrophorétique; b) on choisit un tampon de façon que le premier flux de solvant ait un pH supérieur au point isoélectrique de la protéine; c) on applique un potentiel électrique entre le premier et le second flux de solvant, de façon qu'au moins certains contaminants traversent la membrane et passent dans le second flux, et que la protéine soit sensiblement retenue dans le premier flux ou, si elle pénètre dans la membrane, soit sensiblement empêchée de passer dans le second flux; d) éventuellement on arrête et on inverse périodiquement le potentiel électrique de façon à provoquer le retour dans le premier flux de solvant de toutes les protéines ayant pénétré dans la membrane, sans entraîner sensiblement le retour dans ledit premier flux des contaminants passés dans le second flux; et e) on maintient l'étape (c) jusqu'à ce que le premier flux de solvant contienne la protéine de la coagulation sanguine à la pureté désirée, ladite protéine possédant des caractéristiques sensiblement comparables à celles de la protéine naturelle.

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