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We combine conformer-selective, cryogenic infrared spectroscopy, quantum mechanical computations, and 18O substitution at the reducing end to determine the structural preferences of protonated glucosamine in the gas phase. Cryogenic infrared-infrared (IR-IR) double resonance spectroscopy of helium-tagged protonated glucosamine provides vibrational fingerprints of individual conformers, and 18O isotopic labeling facilitates the match with computed structures and provides a selective probe of the anomeric hydroxyl. This is key for using vibrational spectroscopy for glycan analysis and determining the generality of anomeric memory during glycosidic bond cleavage.
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Priyanka Bansal, Ahmed Ben Faleh, Robert Paul Pellegrinelli, Thomas Rizzo, Stephan Warnke
Priyanka Bansal, Ahmed Ben Faleh, Eduardo Carrascosa Casado, Robert Paul Pellegrinelli, Thomas Rizzo, Stephan Warnke, Lei Yue