AN EFFICIENT PREPARATION AND STRUCTURAL CHARACTERIZATION OF SIALYLGLYCOPEPTIDES FROM PROTEASE TREATED EGG-YOLK

Delipidated egg yolk (DEY) was digested with protease. The digest was ultrafiltered using a molecular weight cut-off of 10,000, and the UF p ermeate was treated with a reverse osmosis membrane. The resulting sia lylglycopeptides-rich Fraction was purified by the combination of anio n exchange and gel filtration chromatography. Two major sialylglycopep tides, A-I and A-II, were characterized as biantennary complex type si alylgiycopeptides having one or two N-acetylneuraminic acid and 1 - 3. 5 amino acids including one asparagine residue by composition analyses and H-1 NMR spectroscopy.