Abstract
The applications of membranes and membrane processes in advanced separations from biotechnology have gained lately a great importance determining their inclusion among the top technologies. This paper presents an original variant for preparation of some affinity membranes from acylated polysulphone and brominated polyphenileneoxide, with immobilized starch as affinity ligand for biospecific separations. Keywords: membranes, phase inversion, affinity ultrafiltration , ligand