Protein purification method

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 1/14 (2006.01) C07K 1/30 (2006.01) C07K 16/00 (2006.01) C07K 16/06 (2006.01) C07K 16/26 (2006.01) C07K 16/28 (2006.01) C07K 16/30 (2006.01)

Patent

CA 2497364

Problem: To provide a method of purifying a physiologically active protein (in particular, an antibody) whereby impurities such as DNA contaminants and viruses can be surely removed by a simple procedure at a low cost with little loss of the physiologically active protein. Means for Resolution: A method of removing impurities in a sample containing a physiologically active protein which comprises the following steps: 1) preparing an aqueous solution of the physiologically active protein-containing sample having a conductivity at a pH value lower than the isoelectric point of the physiologically active protein; and 2) removing the thus formed particles.

L'invention concerne une méthode de purification d'une protéine physiologiquement active (en particulier un anticorps), grâce à laquelle les impuretés telles que les contaminants d'ADN et les virus peuvent être éliminées efficacement par un simple processus et à moindre coût, avec une faible perte de la protéine physiologiquement active. La méthode d'élimination des impuretés dans un échantillon contenant une protéine physiologiquement active consiste 1) à préparer une solution aqueuse faite de l'échantillon contenant une protéine physiologiquement active présentant une conductivité avec une valeur de pH inférieure au point isoélectrique de la protéine physiologiquement active, et 2) à éliminer les particules ainsi formées.

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