Abstract: The present invention relates to a method for inactivating microorganisms especially viruses in protein containing biological compositions, especially blood, placental, serum and plasma components or derivatives solutions of human or animal origin or compositions containing proteins obtained by the extraction of vegetal or animal tissues or obtained by biotechnological techniques, i.e. by culture of natural or recombinant cells of bacterial, yeast, plant or human or animal origin thereby retaining the integrity of the desired protein at a degree suitable for its purpose. By extension the method applies to the inactivation of bacterial or viral preparations, when proteic components or proteic antigens are present, which are intended for use in inactivated or non-living vaccines.

Abstract: A method for reconstituting lyophilized proteins, in which the reconstitution takes place in a receptacle in which the gas pressure is between 1 mbar and atmospheric pressure, is described. In the lyophilized protein-containing receptacle, the gas pressure of between 1 mbar and atmospheric pressure, which gas pressure is required in accordance with the invention, is set by introducing air or an inert gas, and the quantity of water for injection purposes which is required for dissolving the protein is added. The method is particularly suitable for blood coagulation factors, the von Willebrand factor and albumin.

Abstract: A process for the preparation of a protein solution is described which is not prone to flock or particle formation even on heat treatment, the heat treatment being carried out in a glass vessel which has been rinsed out beforehand with a detergent solution and then with distilled water or another detergent-free solvent.

Abstract: The present invention is drawn to method for removing unconventional transmissible agents (UCTA) from aqueous protein solution. This method involves treating the aqueous protein solution with simultaneous electrostatic adsorption and hydrophobic chromatography. The method of the present invention is particularly suitable for treating calf serum or an albumin solution.

Abstract: A process for the preparation of a protein solution is described which is not prone to flock or particle formation even on heat treatment, the heat treatment being carried out in a glass vessel which has been rinsed out beforehand with a detergent solution and then with distilled water or another detergent-free solvent.

Abstract: The invention relates, as new compounds, to derivatives of tetrameric human haemoglobin corresponding to the covalent coupling of a haemoglobin tetramer and a polycarboxy-substituted compound having at least 4 -COO.sup.- groups, the said polycarboxy-substituted compound effecting an internal crosslinking of the two dimers of haemoglobin and conferring thereon an affinity for oxygen which is compatible with an in vivo use of the conjugate when the natural allosteric effector of haemoglobin is not present. Among carboxy-substituted compounds, special mention is made of benzenehexacarboxylate and benzenetetracarboxylate.

Abstract: In the method for purifying factor VIII from cryoprecipitate, which is dissolved and then treated with alumina gel, the extract is diluted to a protein concentration not exceeding approximately 5 g/l and subjected to viral inactivation with solvent/detergent, the inactivated extract containing the solvent/detergent is then subjected to chromatography on a weak anion exchange column which is hydrophilic in nature and factor VIII is then eluted with a dissociating buffer.