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Comparison of the isotopic pattern of molecular ions corresponding to 14N- and 15N- labeled N-acetylheparosan tetradecasaccharide. Analysis of each oligosaccharide was performed using ESI-TOF-MS so as to provide higher isotopic resolution. A: mass spectrum of 15N labeled N-acetylheparosan tetradecasaccharide B:mass spectrum of 14N labeled N-acetylheparosan tetradecasaccharide. C: [15N, 1H] HSQC spectrum of 15N labeled N-acetylheparosan
