A comparison of the results of sequential hydrazinolysis-nitrosation and alkali-mediated cleavage-nitrosation of theO-linked oligosaccharides of gastric mucus glycoproteins
作者:Steven R. Carter、J. Michael Williams、John R. Clamp
DOI:10.1016/0008-6215(90)80138-s
日期:1990.9
Analysis of the oligosaccharides released from pig gastric mucus glycopolypeptides by hydrazinolysis showed that degradation had occurred. Nitrosation of the products followed by reduction gave a mixture that had a low content of 2,5-anhydro-D-talitol, which implied destruction of much of the terminal reducing 2-amino-2-deoxy-D-galactose. Under the conditions of hydrazinolysis, cellobiose was largely unchanged but laminaribiose gave a complex mixture that probably contained glucose hydrazone (13C-n.m.r. data). In order to avoid degradation, the hydrazinolysis-nitrosation sequence should be applied to the reduced oligosaccharides released on cleavage with alkali.