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To investigate the possibility of structural assignment based on negative-ion tandem multistage (MSn) mass spectral matching, four isomers of 2-aminopyridine (PA)-derivatized monosialylated(More)
Isomeric oligosaccharides and isomeric glycopeptides are sometimes difficult to separate on normal-phase (NP) and reversed-phase (RP) columns. A zwitterionic type of hydrophilic-interaction(More)