A METHOD FOR ISOLATING AND PURIFYING IMMUNO-MODULATING POLYPEPTIDE FROM COW PLACENTA

摘要

The present invention provides a method for isolating and purifying immuno-modulating polypeptide from cow placenta, which is characterized by using the steps of anion-exchange chromatography, gel exclusion chromatography and reverse-phase high performance liquid chromatography to isolate and purify immuno-modulating polypeptide from cow placenta, identifying its activity of stimulating lymphocyte proliferation in vitro by MTT method, then determining its molecular weight by MALDI-TOF-MS, its isoelectric point by CIEF and its amino acid sequence with analyzer for protein sequencing. Since the obtained immuno-modulating polypeptide by the method according to the present invention has more than 90% purity, its bioactivity can reach medicinal standards.