Sequence Ion Structures and Dissociation Chemistry of Deprotonated Sucrose Anions

We investigate the tandem mass spectrometry of regiospecifically labeled, deprotonated sucrose analytes. We utilize density functional theory calculations to model the pertinent gas-phase fragmentation chemistry of the prevalent glycosidic bond cleavages ( B 1 -Y 1 and C 1 -Z 1 reactions) and compar...

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Bibliographic Details
Published in:Journal of the American Society for Mass Spectrometry 2018-12, Vol.29 (12), p.2380-2393
Main Authors: Bythell, Benjamin J., Rabus, Jordan M., Wagoner, Ashley R., Abutokaikah, Maha T., Maître, Philippe
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
Analytical Chemistry
Anions
Banded structure
Bioinformatics
Biotechnology
CARBOHYDRATES
Carbon
Carbonyls
Chemical Sciences
Chemistry
Chemistry and Materials Science
COLLISIONS
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY FUNCTIONAL METHOD
Density functional theory
Diagnostic systems
DISSOCIATION
FORECASTING
FRAGMENTATION
GLUCOSE
INFRARED SPECTRA
Ions
Mass spectrometry
MASS SPECTROSCOPY
Organic Chemistry
Proteomics
Research Article
SACCHAROSE
Sucrose
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Summary:We investigate the tandem mass spectrometry of regiospecifically labeled, deprotonated sucrose analytes. We utilize density functional theory calculations to model the pertinent gas-phase fragmentation chemistry of the prevalent glycosidic bond cleavages ( B 1 -Y 1 and C 1 -Z 1 reactions) and compare these predictions to infrared spectroscopy experiments on the resulting B 1 and C 1 product anions. For the C 1 anions, barriers to interconversion of the pyranose [α-glucose-H] − , C 1 anions to entropically favorable ring-open aldehyde-terminated forms were modest (41 kJ mol −1 ) consistent with the observation of a band assigned to a carbonyl stretch at ~ 1680–1720 cm −1 . For the B 1 anions, our transition structure calculations predict the presence of both deprotonated 1,6-anhydroglucose and carbon 2-ketone ((4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)dihydro-2H-pyran-3(4H)-one) anion structures, with the latter predominating. This hypothesis is supported by our spectroscopic data which show diagnostic bands at 1600, 1674, and 1699 cm −1 (deprotonated carbon 2-ketone structures), and at ~ 1541 cm −1 (both types of structure) and RRKM rate calculations. The deprotonated carbon 2-ketone structures are also the lowest energy product B 1 anions. Graphical Abstract ᅟ
ISSN:1044-0305
1879-1123
DOI:10.1007/s13361-018-2065-0