The Absence of Quadrupolar Nuclei Facilitates Efficient 13 C Hyperpolarization via Reversible Exchange with Parahydrogen

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Danila A BarskiyEduard Y Chekmenev

Abstract

Nuclear spin hyperpolarization techniques are revolutionizing the field of 13 C molecular MRI. While dissolution dynamic nuclear polarization (d-DNP) is currently the leading technique, it is generally slow (requiring ≈1 h) and costly (≈$USD106 ). As a consequence of carbon's central place in biochemistry, tremendous progress using 13 C d-DNP bioimaging has been demonstrated to date including a number of clinical trials. Despite numerous attempts to develop alternatives to d-DNP, the competing methods have faced significant translational challenges. Efficient hyperpolarization of 15 N, 31 P, and other heteronuclei using signal amplification by reversible exchange (SABRE) has been reported in 2015, but extension of this technique to 13 C has proven to be challenging. Here, we present efficient hyperpolarization of 13 C nuclei using micro-Tesla SABRE. Up to ca. 6700-fold enhancement of nuclear spin polarization at 8.45 T is achieved within seconds, corresponding to P13C ≈4.4 % using 50 % parahydrogen (P13C >14 % would be feasible using more potent ≈100 % parahydrogen). Importantly, the 13 C polarization achieved via SABRE strongly depends not only upon spin-lattice relaxation, but also upon the presence of 15 N (I=1/2) versus qua...Continue Reading

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