Preparation of pharmaceutical grade hemoglobins by heat...

C - Chemistry – Metallurgy – 07 – K

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C07K 14/805 (2006.01) A61K 38/42 (2006.01) C07K 1/107 (2006.01) C07K 1/30 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2229845

During the purification of pharmaceutical grade cross-linked hemoglobin mixtures of cross-linked and uncross-linked hemoglobin are heated in the presence of nonstoichiometric amounts of oxygen, resulting in the selective precipitation of the uncross-linked hemoglobin. After separation of the precipitated uncross-linked tetramers, the cross-linked hemoglobin remaining in the supernatant is so purified that a further chromatography purification step is unnecessary. This hemoglobin is highly cross-linked, absolutely free of chromatography fines, and has a low methemoglobin content.

Au cours de la purification d'hémoglobines réticulées de qualité pharmaceutique, des mélanges d'hémoglobine réticulée et non réticulée sont chauffés en présence d'une quantité d'oxygène non stoechiométrique. A la suite de cette opération, l'hémoglobine non réticulée se précipite. Après séparation des tétramères non réticulés se précipite, l'hémoglobine réticulée restant dans le liquide surnageant est si pure qu'il n'est pas nécessaire de la soumettre à une nouvelle étape de purification par chromatographie. Cette hémoglobine est fortement réticulée, totalement libre de déchets chromatographiques, et a une faible teneur en méthémoglobine.

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