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Salnikov OG, Trofimov IA, Bender ZT, Trepakova AI, Xu J, Wibbels GL, Shchepin RV, Koptyug IV, Barskiy DA. Parahydrogen-Induced Polarization of 14N Nuclei. Angew Chem Int Ed Engl 2024:e202402877. [PMID: 38523072 DOI: 10.1002/anie.202402877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/22/2024] [Accepted: 03/22/2024] [Indexed: 03/26/2024]
Abstract
Hyperpolarization techniques provide a dramatic increase in sensitivity of nuclear magnetic resonance spectroscopy and imaging. In spite of the outstanding progress in solution-state hyperpolarization of spin-1/2 nuclei, hyperpolarization of quadrupolar nuclei remains challenging. Here, hyperpolarization of quadrupolar 14N nuclei with natural isotopic abundance of >99 % is demonstrated. This is achieved via pairwise addition of parahydrogen to tetraalkylammonium salts with vinyl or allyl unsaturated moieties followed by a subsequent polarization transfer from 1H to 14N nuclei at high magnetic field using PH-INEPT or PH-INEPT+ radiofrequency pulse sequence. Catalyst screening identified water-soluble rhodium complex [Rh(P(m-C6H4SO3Na)3)3Cl] as the most efficient catalyst for hyperpolarization of the substrates under study, providing up to 1.3 % and up to 6.6 % 1H polarization in the cases of vinyl and allyl precursors, respectively. The performance of PH-INEPT and PH-INEPT+ pulse sequences was optimized with respect to interpulse delays, and the resultant experimental dependences were in good agreement with simulations. As a result, 14N NMR signal enhancement of up to 760-fold at 7.05 T (corresponding to 0.15 % 14N polarization) was obtained.
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Affiliation(s)
- Oleg G Salnikov
- International Tomography Center SB RAS, 3 A Institutskaya St., Novosibirsk, 630090, Russia
| | - Ivan A Trofimov
- International Tomography Center SB RAS, 3 A Institutskaya St., Novosibirsk, 630090, Russia
| | - Zachary T Bender
- South Dakota School of Mines & Technology, Rapid City, South Dakota, 57701, United States
| | - Alexandra I Trepakova
- International Tomography Center SB RAS, 3 A Institutskaya St., Novosibirsk, 630090, Russia
| | - Jingyan Xu
- Helmholtz Institute Mainz, GSI Helmholtz Center for Heavy Ion Research GmbH, and, Institute of Physics, Johannes Gutenberg-Universität, Mainz, 55128, Germany
| | - Garrett L Wibbels
- South Dakota School of Mines & Technology, Rapid City, South Dakota, 57701, United States
| | - Roman V Shchepin
- South Dakota School of Mines & Technology, Rapid City, South Dakota, 57701, United States
| | - Igor V Koptyug
- International Tomography Center SB RAS, 3 A Institutskaya St., Novosibirsk, 630090, Russia
| | - Danila A Barskiy
- Helmholtz Institute Mainz, GSI Helmholtz Center for Heavy Ion Research GmbH, and, Institute of Physics, Johannes Gutenberg-Universität, Mainz, 55128, Germany
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Trepakova AI, Skovpin IV, Chukanov NV, Salnikov OG, Chekmenev EY, Pravdivtsev AN, Hövener JB, Koptyug IV. Subsecond Three-Dimensional Nitrogen-15 Magnetic Resonance Imaging Facilitated by Parahydrogen-Based Hyperpolarization. J Phys Chem Lett 2022; 13:10253-10260. [PMID: 36301252 PMCID: PMC9983028 DOI: 10.1021/acs.jpclett.2c02705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Magnetic resonance imaging (MRI) provides unique information about the internal structure and function of living organisms in a non-invasive way. The use of conventional proton MRI for the observation of real-time metabolism is hampered by the dominant signals of water and fat, which are abundant in living organisms. Heteronuclear MRI in conjunction with the hyperpolarization methods does not encounter this issue. In this work, we polarized 15N nuclei of [15N1]fampridine (a drug used for the treatment of multiple sclerosis) to the level of 4% in nuclear magnetic resonance (NMR) experiments and 0.7% in MRI studies using spin-lock-induced crossing combined with signal amplification by reversible exchange. Consequently, three-dimensional 15N MRI of the hyperpolarized 15N-labeled drug was acquired in 0.1 s with a signal-to-noise ratio of 70. In addition, the NMR signal enhancements for 15N-enriched fampridine and fampridine with a natural abundance of 15N nuclei were compared and an explanation for their difference was proposed.
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Affiliation(s)
- Alexandra I. Trepakova
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk, 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
- Institute of Cytology and Genetics, SB RAS, 10 Acad. Lavrentiev Ave., Novosibirsk, 630090, Russia
| | - Ivan V. Skovpin
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk, 630090, Russia
| | - Nikita V. Chukanov
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk, 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
| | - Oleg G. Salnikov
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk, 630090, Russia
| | - Eduard Y. Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, Michigan, 48202, USA
- Russian Academy of Sciences (RAS), 14 Leninskiy Prospekt, Moscow, 119991, Russia
| | - Andrey N. Pravdivtsev
- Department of Radiology and Neuroradiology Section Biomedical Imaging, MOIN CC, Universitätsklinikum Schleswig-Holstein, Universität Kiel, 14 Am Botanischen Garten, Kiel, 24118, Germany
| | - Jan-Bernd Hövener
- Department of Radiology and Neuroradiology Section Biomedical Imaging, MOIN CC, Universitätsklinikum Schleswig-Holstein, Universität Kiel, 14 Am Botanischen Garten, Kiel, 24118, Germany
| | - Igor V. Koptyug
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk, 630090, Russia
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