Enhancing 19F Benchtop NMR Spectroscopy by Combining para-Hydrogen Hyperpolarization and Multiplet Refocusing

Ana I. Silva Terra, Matheus Rossetto, Claire L. Dickson, George Peat, Dušan Uhrín, Meghan E. Halse*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Benchtop NMR spectrometers provide a promising alternative to high-field NMR for applications that are limited by instrument size and/or cost. 19F benchtop NMR is attractive due to the larger chemical shift range of 19F relative to 1H and the lack of background signal in most applications. However, practical applications of benchtop 19F NMR are limited by its low sensitivity due to the relatively weak field strengths of benchtop NMR spectrometers. Here we present a sensitivity-enhancement strategy that combines SABRE (Signal Amplification By Reversible Exchange) hyperpolarization with the multiplet refocusing method SHARPER (Sensitive, Homogeneous, And Resolved PEaks in Real time). When applied to a range of fluoropyridines, SABRE-SHARPER achieves overall signal enhancements of up to 5700-fold through the combined effects of hyperpolarization and line-narrowing. This approach can be generalized to the analysis of mixtures through the use of a selective variant of the SHARPER sequence, selSHARPER. The ability of SABRE-selSHARPER to simultaneously boost sensitivity and discriminate between two components of a mixture is demonstrated, where selectivity is achieved through a combination of selective excitation and the choice of polarization transfer field during the SABRE step.

Original languageEnglish
Pages (from-to)73-81
Number of pages9
JournalACS Measurement Science Au
Volume3
Issue number1
Early online date8 Nov 2022
DOIs
Publication statusE-pub ahead of print - 8 Nov 2022

Keywords / Materials (for Non-textual outputs)

  • F NMR
  • benchtop NMR spectroscopy
  • NMR sensitivity enhancement
  • SABRE hyperpolarization
  • SHARPER

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