Purification of immunoglobulins

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 1/22 (2006.01)

Patent

CA 2752393

The present invention pertains to improved methods of using dye-ligand affinity chromatography for the isolation of antibodies or proteins comprising an antibody fragment (such as Fc fusion proteins) from a mixture of undesirable contaminants. In particular, the use of an organic polymer such as polyethylene glycol (PEG) in the elution phase of an antibody/dye-ligand chromatography isolation procedure results in improved separation of target antibodies from undesirable contaminants. The methods described herein are particularly useful in separating or removing antibody aggregates, misfolded antibodies, and virus contaminants from target antibodies.

La présente invention concerne des procédés améliorés d'utilisation d'une chromatographie d'affinité de colorant-ligand pour isoler des anticorps ou des protéines qui comportent un fragment d'anticorps (telles que les protéines hybrides Fc) d'un mélange de contaminants indésirables. En particulier, l'utilisation d'un polymère organique tel que du polyéthylène glycol (PEG) dans la phase d'élution d'un procédé d'isolement par chromatographie anticorps/colorant-ligand a pour résultat une meilleure séparation des anticorps cibles des contaminants indésirables. Les procédés décrits par les présentes sont particulièrement utiles pour séparer ou éliminer des agrégats d'anticorps, des anticorps mal repliés et des contaminants viraux d'anticorps cibles.

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