METHOD FOR PRODUCING A IGG IMMUNOGLOBULIN SOLUTION WITHOUT SIDE EFFECTS FOR THE INTRAVENOUS APPLICATION.

摘要

1. Process for obtaining a chemically unmodified, non-enzymatically treated, essentially pure aqueous IgG immunoglobulin solution which is free of side effects and residues, is for intravenous administration, and has anticomplementary activity which is no different from that of natural plasma, high stability and a content of less than 5% by weight of IgA immunoglobulin, by purification and enrichment of the IgG immunoglobulin fraction in several steps, such as precipitation, filtration, adsorption and dialysis, characterized in that a) a Cohn fraction II + III (crude globulin) or a crude immunoglobulin fraction obtained by the Rivanol/ammonium sulphate process is converted into an aqueous solution, which is dialysed to remove the precipitant, and the euglobulins are precipitated by adjusting to a conductivity of less than 3 X 10**2 mu S and a pH of 5.3 to 5.5 at 0-10 degrees C, the enzymatic activity is removed from the supernatant by adsorption onto a mineral adsorbent, and most of the IgA fraction of the immunoglobulin in the supernatant which has thus been obtained is removed by adsorption onto 0.5-1.5 g/l diethylaminoethyl-ion exchanger at a pH of 6.5 to 7.5, and the adsorbent is removed, whereupon b) the IgG immunoglobulin solution which has thus been purified and enriched is stabilized by acid treatment at pH 2.5-4.2, and then c) the solution is neutralized and heated at 40-50 degrees C and neutral pH for 20-40 minutes and, after cooling, the major part of the IgM, denatured or other aggregates are removed by two-stage fractional precipitation, with each removal of the high molecular weight protein precipitate being followed by precipitation of the IgG fraction to be used as a basis for the further purification operations, and the IgG fraction from the final precipitation is dissolved in water and dialysed, whereupon d) the dialysate is once more converted into an aqueous solution, the latter is treated with active charcoal to remove low molecular weight fractions, and the solution obtained after removal of the active charcoal is treated with aluminium hydroxide, which has been precipitated in situ, at a pH of 7.0 to 8.0 to remove pyrogenic substances, the aluminium hydroxide is removed, and the IgG fraction is precipitated from the resulting solution and converted into the solution which can be used.