The Journal of Physical Chemistry C
American Chemical Society (ACS)
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Generalizing, Extending, and Maximizing Nitrogen-15 Hyperpolarization Induced by Parahydrogen in Reversible Exchange
Volume: 121, Issue: 12
DOI 10.1021/acs.jpcc.6b12097

Highlights

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Abstract

jp-2016-120978_0006

Signal Amplification by Reversible Exchange (SABRE) is a fast and convenient NMR hyperpolarization method that uses cheap and readily available para-hydrogen as a hyperpolarization source. SABRE can hyperpolarize protons and heteronuclei. Here we focus on the heteronuclear variant introduced as SABRE-SHEATH (SABRE in SHield Enables Alignment Transfer to Heteronuclei) and nitrogen-15 targets in particular. We show that 15N-SABRE works more efficiently and on a wider range of substrates than 1H-SABRE, greatly generalizing the SABRE approach. In addition, we show that nitrogen-15 offers significantly extended T1 times of up to 12 minutes. Long T1 times enable higher hyperpolarization levels but also hold the promise of hyperpolarized molecular imaging for several tens of minutes. Detailed characterization and optimization are presented, leading to nitrogen-15 polarization levels in excess of 10% on several compounds.

https://www.researchpad.co/tools/openurl?pubtype=article&doi=10.1021/acs.jpcc.6b12097&title=Generalizing, Extending, and Maximizing Nitrogen-15 Hyperpolarization Induced by Parahydrogen in Reversible Exchange&author=&keyword=&subject=General Energy,Physical and Theoretical Chemistry,Electronic, Optical and Magnetic Materials,Surfaces, Coatings and Films,