The figures below: (a) conventional NMR and (b) DNP NMR are natural abundance 15N acquisitions of urea at 415 µmol (25mg)*.
The conventional spectrum was acquired over 120 hours (100,000 scans), and the DNP NMR spectrum acquired in a single scan, after 4 hours polarisation.
Signal enhancements comparing DNP and conventional NMR are 2000.
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(a) Conventional NMR |
(b) DNP NMR |
*Comparison data from the same sample collected on a 400MHz spectrometer. Spectra displayed at constant vertical scale.