Fig. 9: 13C polarization during rINEPT and DEPT 90°, and 1Hc polarization during the PHIP-X experiment. | Communications Chemistry

Fig. 9: 13C polarization during rINEPT and DEPT 90°, and 1Hc polarization during the PHIP-X experiment.

From: Nuclear spin polarization of lactic acid via exchange of parahydrogen-polarized protons

Fig. 9

Both sequences transfer the proton polarization perfectly (>99.9%), although DEPT takes about 3 ms longer (a). Timings were set for J(1H, 13C) = 140 Hz. Dashed lines indicate pulses, delays, field changes, and the polarization at the onset of the SOT; numbers correspond to individual information; rINEPT: 1: 90°x 1H, 2: 180°x 1H and 13C, 3: 90°y 1H and 90°x 13C, 4: 180°x 1H and 13C, 5: start of FID. DEPT: 1’: 90°x 1H, 2’: 180°x 1H and 90°x 13C, 3’: 90°y 1H and 180°x 13C, 4’: start of FID. The distances between the vertical lines (a) correspond to the evolution periods of τ = 1/(2J) and τ = 1/(4J) respectively. The simulations were done in the lab-frame, which is the reason for the oscillations (a). The 1H target-polarization (b) had a maximum of about 6% and was 3.3% at the time where the SOT was applied.

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