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PHIP hyperpolarized [1-13C]pyruvate and [1-13C]acetate esters via PH-INEPT polarization transfer monitored by 13C NMR and MRI.


ABSTRACT: Parahydrogen-induced polarization of 13C nuclei by side-arm hydrogenation (PHIP-SAH) for [1-13C]acetate and [1-13C]pyruvate esters with application of PH-INEPT-type pulse sequences for 1H to 13C polarization transfer is reported, and its efficiency is compared with that of polarization transfer based on magnetic field cycling (MFC). The pulse-sequence transfer approach may have its merits in some applications because the entire hyperpolarization procedure is implemented directly in an NMR or MRI instrument, whereas MFC requires a controlled field variation at low magnetic fields. Optimization of the PH-INEPT-type transfer sequences resulted in 13C polarization values of 0.66?±?0.04% and 0.19?±?0.02% for allyl [1-13C]pyruvate and ethyl [1-13C]acetate, respectively, which is lower than the corresponding polarization levels obtained with MFC for 1H to 13C polarization transfer (3.95?±?0.05% and 0.65?±?0.05% for allyl [1-13C]pyruvate and ethyl [1-13C]acetate, respectively). Nevertheless, a significant 13C NMR signal enhancement with respect to thermal polarization allowed us to perform 13C MR imaging of both biologically relevant hyperpolarized molecules which can be used to produce useful contrast agents for the in vivo imaging applications.

SUBMITTER: Svyatova A 

PROVIDER: S-EPMC7952547 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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PHIP hyperpolarized [1-<sup>13</sup>C]pyruvate and [1-<sup>13</sup>C]acetate esters via PH-INEPT polarization transfer monitored by <sup>13</sup>C NMR and MRI.

Svyatova Alexandra A   Kozinenko Vitaly P VP   Chukanov Nikita V NV   Burueva Dudari B DB   Chekmenev Eduard Y EY   Chen Yu-Wen YW   Hwang Dennis W DW   Kovtunov Kirill V KV   Koptyug Igor V IV  

Scientific reports 20210311 1


Parahydrogen-induced polarization of <sup>13</sup>C nuclei by side-arm hydrogenation (PHIP-SAH) for [1-<sup>13</sup>C]acetate and [1-<sup>13</sup>C]pyruvate esters with application of PH-INEPT-type pulse sequences for <sup>1</sup>H to <sup>13</sup>C polarization transfer is reported, and its efficiency is compared with that of polarization transfer based on magnetic field cycling (MFC). The pulse-sequence transfer approach may have its merits in some applications because the entire hyperpolariza  ...[more]

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