Abstract: Stable, intravenously-administrable immune globulin preparations are stabilized against aggregation and polymerization and rendered isotonic with amino acid(s) and non-ionic detergents, polysorbate and polyethylene glycol. The immunoglobulins are derived from human or animal sources, or from hybridomas. Optional, additional stabilizers include various physiologically-acceptable carbohydrates and salts. Polyvinylpyrrolidone can be used in addition to the amino acid(s). Apart from the immunoglobulin itself, the preparations are otherwise essentially protein free. The preparations are useful in immunotherapy and as diagnostic reagents.

Abstract: An improved method of recovering antihemophilic factor (AHF) from cryoprecipitated blood plasma is provided. The improved method incorporates the addition of a calcium ion source during the step of cold precipitation of fibrinogen and fibronectin contaminants, as well as the addition of polyethylene glycol (PEG) at one of various stages of the recovery process. PEG may be added during the cold precipitation of fibrinogen and fibronectin, during the precipitation of AHF, or prior to the filtration of AHF solution. The method of the present invention results in a final AHF product having greatly increased solubility, higher specific activity, and lower fibrinogen and fibronectin content.