the acid catalysis process step in which the n acetylated hydrazone derivative of oligosaccharide of fig2 is contacted with an exchange resin dowex ag 50 x 12 h to replace na with h ions and cleave acetylhydrazone groups producing unreduced oligosaccharides fig4 shows the 1 h 500 mhz nmr spectrum of the oligosaccharides released from trypsin inhibitor type iii 0 chicken egg white purified ovomucoid in one embodiment of the invention fig5 shows the 1 h 500 mhz nmr spectrum of the oligosaccharides released from fetuin type iii from fetal calf serum in another embodiment of the invention fig6 shows the 1 h 500 mhz nmr spectrum of the oligosaccharides released from human serum transferrin in still another embodiment of the invention fig7 shows the 1 h 500 mhz nmr spectrum of the oligosaccharides released from whole human parotid gland in yet another embodiment of the invention the amino acid hydrazides shown in fig1 are compounds of hydrazine and amino acid in which the oh group of the u03b1 carboxyl group of an amino acid is replaced with the hydrazino group nhnh 2 the amino acid moieties of these compounds are contributed by the peptide portion of the glycoprotein the hydrazides are contaminants which in accordance with an important aspect of the invention are removed by the cellulose column chromatography preparatory to carrying out the hydrazinolysis of the glycoprotein or glycohormone starting material the starting material is.