Comprehensive profiling of APTS-Labeled N-Glycans using capillary zone electrophoresis/laser induced fluorescence

Abstract

In this article, a method for the analysis of N-linked glycans derived from glycoproteins is described. Complex mixtures of APTS-labeled neutral and acidic N-glycans were resolved using capillary zone electrophoresis coupled with laser-induced fluorescence detector. All separations were carried out on a polyacrylamide coated capillary with reduced electroosmotic flow. N-glycan pools released from several standard glycoproteins were analyzed in order to generate a migration time database used for the identification of N-glycans released from more complicated samples. In addition, enzymatic digestions using specific and non-specific exoglycosidases were used to positively identify glycan isomeric structures.