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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2018 Oct 2;122(43):24740–24749. doi: 10.1021/acs.jpcc.8b07365

Figure 5.

Figure 5.

(a) Scheme of 1-13C-phosphoenolpyruvate hydrogenation with p-H2 and polarization transfer via MFC producing 13C HP phospholactate with optional deuterium labeling (denoted as Z = H or D). (b-c) 1H NMR spectra acquired in MFC experiments for 13C hyperpolarization of non-deuterated 1-13C-phospholactate (b) immediately after termination of p-H2 bubbling and (c) after relaxation of hyperpolarization. (d-e) 1H NMR spectra acquired in MFC experiments for 13C hyperpolarization of 1-13C-phospholactate-d2 (d) immediately termination of p-H2 bubbling and (e) after relaxation of hyperpolarization. Note that spectra (c) and (e) are multiplied by a factor of 8. p-H2 was bubbled for ~5 s at 140 sccm flow rate and 70 psig total pressure. HA and HB are the two spin-correlated p-H2 derived protons.