Fast and Accurate Quantitation of Glucans in Complex Mixtures by Optimized Heteronuclear NMR Spectroscopy

Marie Bøjstrup, Bent O. Petersen, Sophie Beeren, Ole Hindsgaul, Sebastian Meier

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Nuclear magnetic resonance (NMR) spectroscopy is a widely used technique for mixture analysis, but it has shortcomings in resolving carbohydrate mixtures due to the narrow chemical shift range of glycans in general and fragments of homopolymers in particular. Here, we suggest a protocol toward fast spectroscopic glycan mixture analysis. We show that a plethora of oligosaccharides comprising only α-glucopyranosyl residues can be resolved into distinct quantifiable signals with NMR experiments that are substantially faster than chromatographic runs. Conceptually, the approach fully exploits the narrow line widths of glycans (ν1/2 <3 Hz) in the 13C spectral dimension while disregarding superfluous spectral information in compound identification and quantitation. The acetal (H1C1) groups suffice to spectroscopically resolve ∼20 different starch fragments in optimized 1H–13C NMR with a narrow 13C spectral width (3 ppm) that allows sampling the indirect 13C dimension at high resolution within 15 min. Rapid quantitations by high-resolution NMR data are achieved for glycans at concentrations as low as 10 μg/mL. For validation, comparisons were made with quantitations obtained by more time-consuming chromatographic methods and yielded coefficients of determination (R2) above 0.99.
Original languageEnglish
JournalAnalytical chemistry
Volume85
Issue number18
Pages (from-to)208802-8808
Number of pages7
ISSN0003-2700
DOIs
Publication statusPublished - 2013
Externally publishedYes

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