Membrane and method for the separation of protein-bound substances from a protein-containing liquid by dialysis

摘要

The present invention relates to a method for the separation of protein-bound substances (PBS) and, if present, water-soluble substances from a protein-containing liquid (A), e.g. blood or plasma, containing said substances, by dialysis using a special semipermeable membrane and a dialysate liquid (B) by means of a protein having an acceptor function for the PBS from liquid (A). The membrane useful for this method has to provide a tunnel-like porous structure on the liquid (A) side and a port- and adsorption-structure on the dialysate liquid (B) side. One or both sides of the membrane, i.e. the protein-containing liquid (A) side and the dialysate liquid (B) side of the membrane, are coated with a protein having an acceptor function the PBS. The PBS-containing dialysate liquid (B) obtained after dialysis may then be purified by passing it through a conventional dialyzer in order to remove water-soluble substances and then through a charcoal- and a resin-adsorbent in order to remove PBS from the acceptor protein molecules. The purified dialysate liquid (B) obtained containing the free acceptor protein molecules is then used again as dialysate liquid (B).