| PATENT CLAIMS |
Method for removal of unbound polysaccharide from protein polysaccharide conjugate in mixt of protein-polysaccharide conjugate & unbound polysaccharide in soln., the method comprising adjusting the salt concn of the soln followed by filtration of the mixt through a semipermeable membrane to separate said unbound polysaccharide from said protein-polysaccharide conjugate, wherein the salt concn is adjusted so as to permit passage of the unbound polysaccharide through the semi-permeable membrane without precipitating the protein-polysaccharide conjugate
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