Fig. 7: {1H}13C NMR spectra of 50 mM caffeine in D2O recorded using optimized FT-NMR and PI-SSFP. | Nature Communications

Fig. 7: {1H}13C NMR spectra of 50 mM caffeine in D2O recorded using optimized FT-NMR and PI-SSFP.

From: Maximizing spectral sensitivity without compromising resolution in phase-incremented, steady-state solution NMR

Fig. 7

a FT-NMR data recorded with a 50˚ excitation, 0.65 s acquisition, no extra delays, 2 Hz line broadening. b, c PI-SSFP data recorded with TR = 30 ms, M = 12, α=20˚, processing as described. Shown as well are T1 values measured for individual peaks (a), site assignments (b), and peak-by-peak ratios between the SNRts of the LASSO-processed PI-SSFP and the FT-NMR (c). Notice how slowly relaxing sites benefit the most SNRt-wise from PI-SSFP, and how minor artifacts in PI-SSFP data processed based on the β-coefficients disappear in the LASSO pipeline. All data were collected in ca. 180 s. Empty spectral regions were cropped away for clarity.

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