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Assaf CD, Gui X, Auer AA, Duckett SB, Hövener JB, Pravdivtsev AN. J Coupling Constants of <1 Hz Enable 13C Hyperpolarization of Pyruvate via Reversible Exchange of Parahydrogen. J Phys Chem Lett 2024; 15:1195-1203. [PMID: 38271215 PMCID: PMC10860132 DOI: 10.1021/acs.jpclett.3c02980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Observing pyruvate metabolism in vivo has become a focal point of molecular magnetic resonance imaging. Signal amplification by reversible exchange (SABRE) has recently emerged as a versatile hyperpolarization technique. Tuning of the spin order transfer (SOT) in SABRE is challenging as the small 1H-13C J couplings, in the 13C-pyruvate case, result in SOT being not readily discernible. We demonstrate an experimental method using frequency-selective excitation of parahydrogen-derived polarization SOT sequence (SEPP-SPINEPT); its application led to up to 5700-fold 13C signal gain. In this way, we estimated the lifetime of two Ir-pyruvate SABRE complexes alongside the individual probing of eight small 1H-13C J couplings that connect the hydride protons in these complexes to 1- and 2-13C pyruvate spins, affording values between 0 and 2.69 Hz. Using electronic structure calculations, we define the low-energy structure of the corresponding complexes. Hence, this study demonstrates a novel approach to analyzing the spin topology of short-lived organometallic complexes.
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Affiliation(s)
- Charbel D Assaf
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Xin Gui
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Alexander A Auer
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Simon B Duckett
- Centre for Hyperpolarization in Magnetic Resonance (CHyM), University of York, Heslington YO10 5NY, U.K
| | - Jan-Bernd Hövener
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Andrey N Pravdivtsev
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Am Botanischen Garten 14, 24118 Kiel, Germany
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2
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Tickner BJ, Dennington M, Collins BG, Gater CA, Tanner TFN, Whitwood AC, Rayner PJ, Watts DP, Duckett SB. Metal-Mediated Catalytic Polarization Transfer from para Hydrogen to 3,5-Dihalogenated Pyridines. ACS Catal 2024; 14:994-1004. [PMID: 38269038 PMCID: PMC10804365 DOI: 10.1021/acscatal.3c05378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 01/26/2024]
Abstract
The neutral catalysts [IrCl(H)2(NHC)(substrate)2] or [IrCl(H)2(NHC)(substrate)(sulfoxide)] are used to transfer polarization from para hydrogen (pH2) to 3,5-dichloropyridine and 3,5-dibromopyridine substrates. This is achieved in a rapid, reversible, and low-cost process that relies on ligand exchange within the active catalyst. Notably, the sulfoxide-containing catalyst systems produced NMR signal enhancements between 1 and 2 orders of magnitude larger than its unmodified counterpart. Consequently, this signal amplification by reversible exchange hyperpolarization method can boost the 1H, 13C, and 15N nuclear magnetic resonance (NMR) signal intensities by factors up to 4350, 1550, and 46,600, respectively (14.0, 1.3, and 15.4% polarization). In this paper, NMR and X-ray crystallography are used to map the evolution of catalytically important species and provide mechanistic rational for catalytic efficiency. Furthermore, applications in spontaneous radiofrequency amplification by stimulated emission and NMR reaction monitoring are also shown.
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Affiliation(s)
- Ben. J. Tickner
- Centre
for Hyperpolarisation in Magnetic Resonance, University of York, Heslington YO10 5NY, U.K.
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
| | - Marcus Dennington
- Centre
for Hyperpolarisation in Magnetic Resonance, University of York, Heslington YO10 5NY, U.K.
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
| | - Benjamin G. Collins
- Centre
for Hyperpolarisation in Magnetic Resonance, University of York, Heslington YO10 5NY, U.K.
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
- Department
of Physics, Engineering and Technology, University of York, Heslington YO10 5DD, U.K.
| | - Callum A. Gater
- Centre
for Hyperpolarisation in Magnetic Resonance, University of York, Heslington YO10 5NY, U.K.
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
| | - Theo F. N. Tanner
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
| | | | - Peter J. Rayner
- Centre
for Hyperpolarisation in Magnetic Resonance, University of York, Heslington YO10 5NY, U.K.
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
| | - Daniel P. Watts
- Department
of Physics, Engineering and Technology, University of York, Heslington YO10 5DD, U.K.
| | - Simon B. Duckett
- Centre
for Hyperpolarisation in Magnetic Resonance, University of York, Heslington YO10 5NY, U.K.
- Department
of Chemistry, University of York, Heslington YO10 5DD, U.K.
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3
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Min S, Baek J, Kim J, Jeong HJ, Chung J, Jeong K. Water-Compatible and Recyclable Heterogeneous SABRE Catalyst for NMR Signal Amplification. JACS AU 2023; 3:2912-2917. [PMID: 37885596 PMCID: PMC10598823 DOI: 10.1021/jacsau.3c00487] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 09/20/2023] [Accepted: 09/22/2023] [Indexed: 10/28/2023]
Abstract
A water-compatible and recyclable catalyst for nuclear magnetic resonance (NMR) hyperpolarization via signal amplification by reversible exchange (SABRE) was developed. The [Ir(COD)(IMes)Cl] catalyst was attached to a polymeric resin of bis(2-pyridyl)amine (heterogeneous SABRE catalyst, HET-SABRE catalyst), and it amplified the 1H NMR signal of pyridine up to (-) 4455-fold (43.2%) at 1.4 T in methanol and (-) 50-fold (0.5%) in water. These are the highest amplification factors ever reported among HET-SABRE catalysts and for the first time in aqueous media. Moreover, the HET-SABRE catalyst demonstrated recyclability by retaining its activity in water after more than three uses. This newly designed polymeric resin-based heterogeneous catalyst shows great promise for NMR signal amplification for biomedical NMR and MRI applications in the future.
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Affiliation(s)
- Sein Min
- Department
of Chemistry, Seoul Women’s University, Seoul 01797, South Korea
| | - Juhee Baek
- Department
of Chemistry, Seoul Women’s University, Seoul 01797, South Korea
| | - Jisu Kim
- Department
of Chemistry, Seoul Women’s University, Seoul 01797, South Korea
| | - Hye Jin Jeong
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Jean Chung
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Keunhong Jeong
- Department
of Chemistry, Korea Military Academy, Seoul 01805, South Korea
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4
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Alshehri A, Tickner BJ, Iali W, Duckett SB. Enhancing the NMR signals of plant oil components using hyperpolarisation relayed via proton exchange. Chem Sci 2023; 14:9843-9853. [PMID: 37736655 PMCID: PMC10510812 DOI: 10.1039/d3sc03078d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 08/25/2023] [Indexed: 09/23/2023] Open
Abstract
In this work, the limited sensitivity of magnetic resonance is addressed by using the hyperpolarisation method relayed signal amplification by reversible exchange (SABRE-Relay) to transfer latent magnetism from para-hydrogen, a readily isolated spin isomer of hydrogen gas, to components of key plant oils such as citronellol, geraniol, and nerol. This is achieved via relayed polarisation transfer in which an [Ir(H)2(IMes)(NH2R)3]Cl type complex produces hyperpolarised NH2R free in solution, before labile proton exchange between the hyperpolarisation carrier (NH2R) and the OH-containing plant oil component generates enhanced NMR signals for the latter. Consequently, up to ca. 200-fold 1H (0.65% 1H polarisation) and 800-fold 13C NMR signal enhancements (0.65% 13C polarisation) are recorded for these essential oils in seconds. Remarkably, the resulting NMR signals are not only diagnostic, but prove to propagate over large spin systems via a suitable coupling network. A route to optimise the enhancement process by varying the identity of the carrier NH2R, and its concentration is demonstrated. In order to prove utility, these pilot measurements are extended to study a much wider range of plant-derived molecules including rhodinol, verbenol, (1R)-endo-(+)-fenchyl alcohol, (-)-carveol, and linalool. Further measurements are then described which demonstrate citronellol and geraniol can be detected in an off-the-shelf healthcare product rose geranium oil at concentrations of just a few tens of μM in single scan 1H NMR measurements, which are not visible in comparable thermally polarised NMR experiments. This work therefore presents a significant expansion of the types of molecules amenable to hyperpolarisation using para-hydrogen and illustrates a real-world application in the diagnostic detection of low concentration analytes in mixtures.
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Affiliation(s)
- Adel Alshehri
- Department of Chemistry, Centre for Hyperpolarisation in Magnetic Resonance, University of York Heslington YO10 5NY UK
| | - Ben J Tickner
- Department of Chemistry, Centre for Hyperpolarisation in Magnetic Resonance, University of York Heslington YO10 5NY UK
| | - Wissam Iali
- Department of Chemistry, Centre for Hyperpolarisation in Magnetic Resonance, University of York Heslington YO10 5NY UK
| | - Simon B Duckett
- Department of Chemistry, Centre for Hyperpolarisation in Magnetic Resonance, University of York Heslington YO10 5NY UK
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5
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Tickner BJ, Svensson SKM, Vaara J, Duckett SB. Toward Optimizing and Understanding Reversible Hyperpolarization of Lactate Esters Relayed from para-Hydrogen. J Phys Chem Lett 2022; 13:6859-6866. [PMID: 35861312 PMCID: PMC9340809 DOI: 10.1021/acs.jpclett.2c01442] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The SABRE-Relay hyperpolarization method is used to enhance the 1H and 13C NMR signals of lactate esters, which find use in a wide range of medical, pharmaceutical, and food science applications. This is achieved by the indirect relay of magnetization from para-hydrogen, a spin isomer of dihydrogen, to OH-containing lactate esters via a SABRE-hyperpolarized NH intermediary. This delivers 1H and 13C NMR signal enhancements as high as 245- and 985-fold, respectively, which makes the lactate esters far more detectable using NMR. DFT-calculated J-couplings and spin dynamics simulations indicate that, while polarization can be transferred from the lactate OH to other 1H nuclei via the J-coupling network, incoherent mechanisms are needed to polarize the 13C nuclei at the 6.5 mT transfer field used. The resulting sensitivity boost is predicted to be of great benefit for the NMR detection and quantification of low concentrations (<mM) of lactate esters and could provide a useful precursor for the production of hyperpolarized lactate, a key metabolite.
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Affiliation(s)
- Ben J. Tickner
- Centre
for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, United Kingdom, YO10 5NY
- NMR
Research Unit, University of Oulu, P.O. Box 3000, FI-90014, Oulu, Finland
| | | | - Juha Vaara
- NMR
Research Unit, University of Oulu, P.O. Box 3000, FI-90014, Oulu, Finland
| | - Simon B. Duckett
- Centre
for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, United Kingdom, YO10 5NY
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Fraser R, Rutjes FPJT, Feiters MC, Tessari M. Analysis of Complex Mixtures by Chemosensing NMR Using para-Hydrogen-Induced Hyperpolarization. Acc Chem Res 2022; 55:1832-1844. [PMID: 35709417 PMCID: PMC9260963 DOI: 10.1021/acs.accounts.1c00796] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Nuclear magnetic resonance (NMR) is a powerful technique for chemical
analysis. The use of NMR to investigate dilute analytes in complex
systems is, however, hampered by its relatively low sensitivity. An
additional obstacle is represented by the NMR signal overlap. Because
solutes in a complex mixture are usually not isotopically labeled,
NMR studies are often limited to 1H measurements, which,
because of the modest dispersion of the 1H resonances (typically
∼10 ppm), can result in challenging signal crowding. The low
NMR sensitivity issue can be alleviated by nuclear spin hyperpolarization
(i.e., transiently increasing the differences in nuclear spin populations),
which determines large NMR signal enhancements. This has been demonstrated
for hyperpolarization methods such as dynamic nuclear polarization,
spin-exchange optical pumping and para-hydrogen-induced
polarization (PHIP). In particular, PHIP has grown into a fast, efficient,
and versatile technique since the recent discovery of non-hydrogenative
routes to achieve nuclear spin hyperpolarization. For instance,
signal amplification by reversible exchange (SABRE)
can generate proton as well as heteronuclear spin hyperpolarization
in a few seconds in compounds that are able to transiently bind to
an iridium catalyst in the presence of para-hydrogen
in solution. The hyperpolarization transfer catalyst acts as a chemosensor
in the sense that it is selective for analytes that can coordinate
to the metal center, such as nitrogen-containing aromatic heterocycles,
sulfur heteroaromatic compounds, nitriles, Schiff bases, diaziridines,
carboxylic acids, and amines. We have demonstrated that the signal
enhancement achieved by SABRE allows rapid NMR detection and quantification
of a mixture of substrates down to low-micromolar concentration. Furthermore,
in the transient complex, the spin configuration of p-H2 can be easily converted to spin hyperpolarization
to produce up to 1000-fold enhanced NMR hydride signals. Because the
hydrides’ chemical shifts are highly sensitive to the structure
of the analyte associating with the iridium complex, they can be employed
as hyperpolarized “probes” to signal the presence of
specific compounds in the mixture. This indirect detection of the
analytes in solution provides important benefits in the case of complex
systems, as hydrides resonate in a region of the 1H spectrum
(at ca. −20 ppm) that is generally signal-free. The enhanced
sensitivity provided by non-hydrogenative PHIP (nhPHIP), together
with the absence of interference from the complex matrix (usually
resonating between 0 and 10 ppm), set the detection limit for this
NMR chemosensor down to sub-μM concentrations, approximately
3 orders of magnitude lower than for conventional NMR. This nhPHIP
approach represents, therefore, a powerful tool for NMR analysis of
dilute substrates in complex mixtures as it addresses at once the
issues of signal crowding and NMR sensitivity. Importantly, being
performed at high field inside the NMR spectrometer, the method allows
for rapid acquisition of multiple scans, multidimensional hyperpolarized
NMR spectra, in a fashion comparable to that of standard NMR measurements. In this Account, we focus on our chemosensing NMR technology, detailing
its principles, advantages, and limitations and presenting a number
of applications to real systems such as biofluids, beverages, and
natural extracts.
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Affiliation(s)
- Roan Fraser
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Floris P J T Rutjes
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Martin C Feiters
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Marco Tessari
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
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Tickner BJ, Zhivonitko VV. Advancing homogeneous catalysis for parahydrogen-derived hyperpolarisation and its NMR applications. Chem Sci 2022; 13:4670-4696. [PMID: 35655870 PMCID: PMC9067625 DOI: 10.1039/d2sc00737a] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 03/21/2022] [Indexed: 12/18/2022] Open
Abstract
Parahydrogen-induced polarisation (PHIP) is a nuclear spin hyperpolarisation technique employed to enhance NMR signals for a wide range of molecules. This is achieved by exploiting the chemical reactions of parahydrogen (para-H2), the spin-0 isomer of H2. These reactions break the molecular symmetry of para-H2 in a way that can produce dramatically enhanced NMR signals for reaction products, and are usually catalysed by a transition metal complex. In this review, we discuss recent advances in novel homogeneous catalysts that can produce hyperpolarised products upon reaction with para-H2. We also discuss hyperpolarisation attained in reversible reactions (termed signal amplification by reversible exchange, SABRE) and focus on catalyst developments in recent years that have allowed hyperpolarisation of a wider range of target molecules. In particular, recent examples of novel ruthenium catalysts for trans and geminal hydrogenation, metal-free catalysts, iridium sulfoxide-containing SABRE systems, and cobalt complexes for PHIP and SABRE are reviewed. Advances in this catalysis have expanded the types of molecules amenable to hyperpolarisation using PHIP and SABRE, and their applications in NMR reaction monitoring, mechanistic elucidation, biomedical imaging, and many other areas, are increasing.
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Affiliation(s)
- Ben J Tickner
- NMR Research Unit, Faculty of Science, University of Oulu P.O. Box 3000 Oulu 90014 Finland
- Department of Chemical and Biological Physics, Faculty of Chemistry, Weizmann Institute of Science Rehovot 7610001 Israel
| | - Vladimir V Zhivonitko
- NMR Research Unit, Faculty of Science, University of Oulu P.O. Box 3000 Oulu 90014 Finland
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8
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Taylor DA, Natrajan LS, Nilsson M, Adams RW. SABRE-enhanced real-time pure shift NMR spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:1244-1252. [PMID: 34405451 DOI: 10.1002/mrc.5206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/04/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Abstract
Pure shift nuclear magnetic resonance (NMR) methods suppress the effect of homonuclear scalar couplings to produce NMR spectra consisting solely of a single signal for each chemically distinct site. They are increasingly relied upon for analysis of complex molecules and mixtures as they overcome the extensive signal overlap that complicates proton NMR spectra of all but the simplest species. Current broadband pure shift methodologies for 1D proton spectra suffer from reduced sensitivity compared with their conventional counterparts and typically require a large amount of instrument time for low concentration samples. In this study, we demonstrate how the sensitivity limitation may be overcome by transiently increasing the bulk polarization using signal amplification by reversible exchange (SABRE) hyperpolarization. We utilize para-enriched dihydrogen to enhance the pure shift NMR resonances of pyridine by up to a factor of 60 in a single-scan experiment and extend this to propose a method to unambiguously determine mixture components based on the enhancement of their pure shift NMR signals.
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Affiliation(s)
- Daniel A Taylor
- Department of Chemistry, University of Manchester, Manchester, UK
| | | | - Mathias Nilsson
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Ralph W Adams
- Department of Chemistry, University of Manchester, Manchester, UK
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MacCulloch K, Tomhon P, Browning A, Akeroyd E, Lehmkuhl S, Chekmenev EY, Theis T. Hyperpolarization of common antifungal agents with SABRE. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:1225-1235. [PMID: 34121211 PMCID: PMC8595556 DOI: 10.1002/mrc.5187] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 06/08/2021] [Accepted: 06/10/2021] [Indexed: 05/09/2023]
Abstract
Signal amplification by reversible exchange (SABRE) is a robust and inexpensive hyperpolarization (HP) technique to enhance nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) signals using parahydrogen (pH2 ). The substrate scope of SABRE is continually expanding. Here, we present the polarization of three antifungal drugs (voriconazole, clotrimazole, and fluconazole) and elicit the detailed HP mechanisms for 1 H and 15 N nuclei. In this exploratory work, 15 N polarization values of ~1% were achieved using 50% pH2 in solution of 3-mM catalyst and 60-mM substrate in perdeuterated methanol. All hyperpolarized 15 N sites exhibited long T1 in excess of 1 min at a clinically relevant field of 1 T. Hyperpolarizing common drugs is of interest due to their potential biomedical applications as MRI contrast agents or to enable studies on protein dynamics at physiological concentrations. We optimize the polarization with respect to temperature and the polarization transfer field (PTF) for 1 H nuclei in the millitesla regime and for 15 N nuclei in the microtesla regime, which provides detailed insights into exchange kinetics and spin evolution. This work broadens the SABRE substrate scope and provides mechanistic and kinetic insights into the HP process.
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Affiliation(s)
- Keilian MacCulloch
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Patrick Tomhon
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Austin Browning
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Evan Akeroyd
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Sören Lehmkuhl
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI, USA
- Chemistry, Russian Academy of Sciences, Moscow, Moscow Region, Russia
| | - Thomas Theis
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
- Joint Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC and North Carolina State University, Raleigh, NC, USA
- Department of Physics, North Carolina State University, Raleigh, NC, USA
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10
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Tickner BJ, Zhivonitko VV, Telkki VV. Ultrafast Laplace NMR to study metal-ligand interactions in reversible polarisation transfer from parahydrogen. Phys Chem Chem Phys 2021; 23:16542-16550. [PMID: 34338685 PMCID: PMC8359933 DOI: 10.1039/d1cp02383g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 07/22/2021] [Indexed: 12/11/2022]
Abstract
Laplace Nuclear Magnetic Resonance (NMR) can determine relaxation parameters and diffusion constants, giving valuable information about molecular structure and dynamics. Information about relaxation times (T1 and T2) and the self-diffusion coefficient (D) can be extracted from exponentially decaying NMR signals by performing a Laplace transform, which is a different approach to traditional NMR involving Fourier transform of a free induction decay. Ultrafast Laplace NMR uses spatial encoding to collect the entire data set in just a single scan which provides orders of magnitude time savings. In this work we use ultrafast Laplace NMR D-T2 correlation sequences to measure key relaxation (T2) and diffusion (D) parameters of methanolic solutions containing pyridine. For the first time we combine this technique with the hyperpolarisation technique Signal Amplification By Reversible Exchange (SABRE), which employs an iridium catalyst to reversibly transfer polarisation from parahydrogen, to boost the 1H NMR signals of pyridine by up to 300-fold. We demonstrate use of ultrafast Laplace NMR to monitor changes in pyridine T2 and D associated with ligation to the iridium SABRE catalyst and kinetic isotope exchange reactions. The combined 1440-fold reduction in experiment time and 300-fold 1H NMR signal enhancement allow the determination of pyridine D coefficients and T2 values at 25 mM concentrations in just 3 seconds using SABRE hyperpolarised ultrafast Laplace NMR.
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Affiliation(s)
- Ben. J. Tickner
- NMR Research Unit, Faculty of Science, University of Oulu90014Finland
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11
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Chukanov NV, Shchepin RV, Joshi SM, Kabir MSH, Salnikov OG, Svyatova A, Koptyug IV, Gelovani JG, Chekmenev EY. Synthetic Approaches for 15 N-Labeled Hyperpolarized Heterocyclic Molecular Imaging Agents for 15 N NMR Signal Amplification by Reversible Exchange in Microtesla Magnetic Fields. Chemistry 2021; 27:9727-9736. [PMID: 33856077 PMCID: PMC8273115 DOI: 10.1002/chem.202100212] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Indexed: 12/23/2022]
Abstract
NMR hyperpolarization techniques enhance nuclear spin polarization by several orders of magnitude resulting in corresponding sensitivity gains. This enormous sensitivity gain enables new applications ranging from studies of small molecules by using high-resolution NMR spectroscopy to real-time metabolic imaging in vivo. Several hyperpolarization techniques exist for hyperpolarization of a large repertoire of nuclear spins, although the 13 C and 15 N sites of biocompatible agents are the key targets due to their widespread use in biochemical pathways. Moreover, their long T1 allows hyperpolarized states to be retained for up to tens of minutes. Signal amplification by reversible exchange (SABRE) is a low-cost and ultrafast hyperpolarization technique that has been shown to be versatile for the hyperpolarization of 15 N nuclei. Although large sensitivity gains are enabled by hyperpolarization, 15 N natural abundance is only ∼0.4 %, so isotopic labeling of the molecules to be hyperpolarized is required in order to take full advantage of the hyperpolarized state. Herein, we describe selected advances in the preparation of 15 N-labeled compounds with the primary emphasis on using these compounds for SABRE polarization in microtesla magnetic fields through spontaneous polarization transfer from parahydrogen. Also, these principles can certainly be applied for hyperpolarization of these emerging contrast agents using dynamic nuclear polarization and other techniques.
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Affiliation(s)
- Nikita V Chukanov
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
| | - Roman V Shchepin
- Department of Chemistry, Biology, and Health Sciences, South Dakota School of Mines & Technology, Rapid City, SD 57701, USA
| | - Sameer M Joshi
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
| | - Mohammad S H Kabir
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
| | - Oleg G Salnikov
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
- Boreskov Institute of Catalysis SB RAS, Acad. Lavrentiev Prospekt 5, 630090, Novosibirsk, Russia
| | - Alexandra Svyatova
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
| | - Igor V Koptyug
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
| | - Juri G Gelovani
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
- College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, UAE
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
- Russian Academy of Sciences (RAS), Leninskiy Prospekt 14, 119991, Moscow, Russia
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12
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Vaneeckhaute E, De Ridder S, Tyburn JM, Kempf JG, Taulelle F, Martens JA, Breynaert E. Long-Term Generation of Longitudinal Spin Order Controlled by Ammonia Ligation Enables Rapid SABRE Hyperpolarized 2D NMR. Chemphyschem 2021; 22:1170-1177. [PMID: 33851495 DOI: 10.1002/cphc.202100079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/29/2021] [Indexed: 01/19/2023]
Abstract
Symmetry breaking of parahydrogen using iridium catalysts converts singlet spin order into observable hyperpolarization. In this contribution, iridium catalysts are designed to exhibit asymmetry in their hydrides, regulated by in situ generation of deuterated ammonia governed by ammonium buffers. The concentrations of ammonia (N) and pyridine (P) provide a handle to generate a variety of stereo-chemically asymmetric N-heterocyclic carbene iridium complexes, ligating either [3xP], [2xP;N], [P;2xN] or [3xN] in an octahedral SABRE type configuration. The non-equivalent hydride positions, in correspondence with the ammonium buffer solutions, enables to extend singlet-triplet or S ⟩ → T 0 ⟩ mixing at high magnetic field and experimentally induce prolonged generation of non-equilibrium longitudinal two-spin order. This long-lasting magnetization can be exploited in hyperpolarized 2D-OPSY-COSY experiments providing direct structural information on the catalyst using a single contact with parahydrogen. Separately, field cycling revealed hyperpolarization properties in low-field conditions. Controlling catalyst stereochemistry by introducing small and deuterated ligands, such as deuterated ammonia, simplifies the spin-system. This is shown to unify experimental and theoretically derived field-sweep experiments for four-spin systems.
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Affiliation(s)
- Ewoud Vaneeckhaute
- COK-kat, Centre for Surface Chemistry and Catalysis-Characterisation and Application Team, KU Leuven, Celestijnenlaan 200F, box 2461, B-3001, Leuven, Belgium.,NMRCoRe, NMR/X-Ray platform for Convergence Research, KU Leuven, Celestijnenlaan 200F, box 2461, 3001, Leuven, Belgium
| | - Sophie De Ridder
- COK-kat, Centre for Surface Chemistry and Catalysis-Characterisation and Application Team, KU Leuven, Celestijnenlaan 200F, box 2461, B-3001, Leuven, Belgium
| | - Jean-Max Tyburn
- Bruker Biospin, 34 rue de l'Industrie BP 10002, 67166, Wissembourg Cedex, France
| | - James G Kempf
- Bruker Biospin, 15 Fortune Dr., Billerica, 01821, Massachusetts, United States
| | - Francis Taulelle
- COK-kat, Centre for Surface Chemistry and Catalysis-Characterisation and Application Team, KU Leuven, Celestijnenlaan 200F, box 2461, B-3001, Leuven, Belgium.,NMRCoRe, NMR/X-Ray platform for Convergence Research, KU Leuven, Celestijnenlaan 200F, box 2461, 3001, Leuven, Belgium
| | - Johan A Martens
- COK-kat, Centre for Surface Chemistry and Catalysis-Characterisation and Application Team, KU Leuven, Celestijnenlaan 200F, box 2461, B-3001, Leuven, Belgium.,NMRCoRe, NMR/X-Ray platform for Convergence Research, KU Leuven, Celestijnenlaan 200F, box 2461, 3001, Leuven, Belgium
| | - Eric Breynaert
- COK-kat, Centre for Surface Chemistry and Catalysis-Characterisation and Application Team, KU Leuven, Celestijnenlaan 200F, box 2461, B-3001, Leuven, Belgium.,NMRCoRe, NMR/X-Ray platform for Convergence Research, KU Leuven, Celestijnenlaan 200F, box 2461, 3001, Leuven, Belgium
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13
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Jeong HJ, Min S, Jeong K. Analysis of 1-aminoisoquinoline using the signal amplification by reversible exchange hyperpolarization technique. Analyst 2020; 145:6478-6484. [PMID: 32744263 DOI: 10.1039/d0an00967a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Signal amplification by reversible exchange (SABRE), a parahydrogen-based hyperpolarization technique, is valuable in detecting low concentrations of chemical compounds, which facilitates the understanding of their functions at the molecular level as well as their applicability in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). SABRE of 1-aminoisoquinoline (1-AIQ) is significant because isoquinoline derivatives are the fundamental structures in compounds with notable biological activity and are basic organic building blocks. Through this study, we explain how SABRE is applied to hyperpolarize 1-AIQ for diverse solvent systems such as deuterated and non-deuterated solvents. We observed the amplification of individual protons of 1-AIQ at various magnetic fields. Further, we describe the polarization transfer mechanism of 1-AIQ compared to pyridine using density functional theory (DFT) calculations. This hyperpolarization technique, including the polarization transfer mechanism investigation on 1-AIQ, will provide a firm basis for the future application of the hyperpolarization study on various bio-friendly materials.
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Affiliation(s)
- Hye Jin Jeong
- Department of Chemistry, Korea Military Academy, Seoul 01805, South Korea.
| | - Sein Min
- Department of Chemistry, Seoul Women's University, Seoul 01797, South Korea
| | - Keunhong Jeong
- Department of Chemistry, Korea Military Academy, Seoul 01805, South Korea.
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14
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Kovtunov KV, Koptyug IV, Fekete M, Duckett SB, Theis T, Joalland B, Chekmenev EY. Parawasserstoff‐induzierte Hyperpolarisation von Gasen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kirill V. Kovtunov
- International Tomography Center SB RAS 630090 Novosibirsk Russland
- Department of Natural Sciences Novosibirsk State University Pirogova St. 2 630090 Novosibirsk Russland
| | - Igor V. Koptyug
- International Tomography Center SB RAS 630090 Novosibirsk Russland
- Department of Natural Sciences Novosibirsk State University Pirogova St. 2 630090 Novosibirsk Russland
| | - Marianna Fekete
- Center for Hyperpolarization in Magnetic Resonance (CHyM) University of York Heslington York YO10 5NY UK
| | - Simon B. Duckett
- Center for Hyperpolarization in Magnetic Resonance (CHyM) University of York Heslington York YO10 5NY UK
| | - Thomas Theis
- Department of Chemistry North Carolina State University Raleigh North Carolina 27695-8204 USA
| | - Baptiste Joalland
- Department of Chemistry Integrative Biosciences (Ibio) Karmanos Cancer Institute (KCI) Wayne State University Detroit Michigan 48202 USA
| | - 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) Leninskiy Prospekt 14 Moscow 119991 Russland
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15
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Kovtunov KV, Koptyug IV, Fekete M, Duckett SB, Theis T, Joalland B, Chekmenev EY. Parahydrogen-Induced Hyperpolarization of Gases. Angew Chem Int Ed Engl 2020; 59:17788-17797. [PMID: 31972061 PMCID: PMC7453723 DOI: 10.1002/anie.201915306] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Indexed: 12/16/2022]
Abstract
Imaging of gases is a major challenge for any modality including MRI. NMR and MRI signals are directly proportional to the nuclear spin density and the degree of alignment of nuclear spins with applied static magnetic field, which is called nuclear spin polarization. The level of nuclear spin polarization is typically very low, i.e., one hundred thousandth of the potential maximum at 1.5 T and a physiologically relevant temperature. As a result, MRI typically focusses on imaging highly concentrated tissue water. Hyperpolarization methods transiently increase nuclear spin polarizations up to unity, yielding corresponding gains in MRI signal level of several orders of magnitude that enable the 3D imaging of dilute biomolecules including gases. Parahydrogen-induced polarization is a fast, highly scalable, and low-cost hyperpolarization technique. The focus of this Minireview is to highlight selected advances in the field of parahydrogen-induced polarization for the production of hyperpolarized compounds, which can be potentially employed as inhalable contrast agents.
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Affiliation(s)
- Kirill V Kovtunov
- International Tomography Center, SB RAS, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
| | - Igor V Koptyug
- International Tomography Center, SB RAS, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
| | - Marianna Fekete
- Center for Hyperpolarization in Magnetic Resonance (CHyM), University of York, Heslington, York, YO10 5NY, UK
| | - Simon B Duckett
- Center for Hyperpolarization in Magnetic Resonance (CHyM), University of York, Heslington, York, YO10 5NY, UK
| | - Thomas Theis
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, USA
| | - Baptiste Joalland
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, Michigan, 48202, USA
| | - 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), Leninskiy Prospekt 14, Moscow, 119991, Russia
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16
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Jeong HJ, Min S, Chae H, Kim S, Lee G, Namgoong SK, Jeong K. Signal amplification by reversible exchange for COVID-19 antiviral drug candidates. Sci Rep 2020; 10:14290. [PMID: 32868801 PMCID: PMC7459298 DOI: 10.1038/s41598-020-71282-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 08/11/2020] [Indexed: 12/02/2022] Open
Abstract
Several drug candidates have been proposed and tested as the latest clinical treatment for coronavirus pneumonia (COVID-19). Chloroquine, hydroxychloroquine, ritonavir/lopinavir, and favipiravir are under trials for the treatment of this disease. The hyperpolarization technique has the ability to further provide a better understanding of the roles of these drugs at the molecular scale and in different applications in the field of nuclear magnetic resonance/magnetic resonance imaging. This technique may provide new opportunities in diagnosis and research of COVID-19. Signal amplification by reversible exchange-based hyperpolarization studies on large-sized drug candidates were carried out. We observed hyperpolarized proton signals from whole structures, due to the unprecedented long-distance polarization transfer by para-hydrogen. We also found that the optimal magnetic field for the maximum polarization transfer yield was dependent on the molecular structure. We can expect further research on the hyperpolarization of other important large molecules, isotope labeling, as well as polarization transfer on nuclei with a long spin relaxation time. A clinical perspective of these features on drug molecules can broaden the application of hyperpolarization techniques for therapeutic studies.
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Affiliation(s)
- Hye Jin Jeong
- Department of Chemistry, Korea Military Academy, Seoul, 01805, South Korea
| | - Sein Min
- Department of Chemistry, Seoul Women's University, Seoul, 01797, South Korea
| | - Heelim Chae
- Department of Chemistry, Seoul Women's University, Seoul, 01797, South Korea
| | - Sarah Kim
- Department of Chemistry, Seoul Women's University, Seoul, 01797, South Korea
| | - Gunwoo Lee
- Department of Chemistry, Korea Military Academy, Seoul, 01805, South Korea
| | - Sung Keon Namgoong
- Department of Chemistry, Seoul Women's University, Seoul, 01797, South Korea
| | - Keunhong Jeong
- Department of Chemistry, Korea Military Academy, Seoul, 01805, South Korea.
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17
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Barskiy DA, Knecht S, Yurkovskaya AV, Ivanov KL. SABRE: Chemical kinetics and spin dynamics of the formation of hyperpolarization. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2019; 114-115:33-70. [PMID: 31779885 DOI: 10.1016/j.pnmrs.2019.05.005] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 05/16/2019] [Indexed: 05/22/2023]
Abstract
In this review, we present the physical principles of the SABRE (Signal Amplification By Reversible Exchange) method. SABRE is a promising hyperpolarization technique that enhances NMR signals by transferring spin order from parahydrogen (an isomer of the H2 molecule that is in a singlet nuclear spin state) to a substrate that is to be polarized. Spin order transfer takes place in a transient organometallic complex which binds both parahydrogen and substrate molecules; after dissociation of the SABRE complex, free hyperpolarized substrate molecules are accumulated in solution. An advantage of this method is that the substrate is not modified chemically, and its polarization can be regenerated multiple times by bubbling fresh parahydrogen through the solution. Thus, SABRE requires two key ingredients: (i) polarization transfer and (ii) chemical exchange of both parahydrogen and substrate. While there are several excellent reviews on applications of SABRE, the background of the method is discussed less frequently. In this review we aim to explain in detail how SABRE hyperpolarization is formed, focusing on key aspects of both spin dynamics and chemical kinetics, as well as on the interplay between them. Hence, we first cover the known spin order transfer methods applicable to SABRE - cross-relaxation, coherent spin mixing at avoided level crossings, and coherence transfer - and discuss their practical implementation for obtaining SABRE polarization in the most efficient way. Second, we introduce and explain the principle of SABRE hyperpolarization techniques that operate at ultralow (<1 μT), at low (1μT to 0.1 T) and at high (>0.1 T) magnetic fields. Finally, chemical aspects of SABRE are discussed in detail, including chemical systems that are amenable to SABRE and the exchange processes that are required for polarization formation. A theoretical treatment of the spin dynamics and their interplay with chemical kinetics is also presented. This review outlines known aspects of SABRE and provides guidelines for the design of new SABRE experiments, with the goal of solving practical problems of enhancing weak NMR signals.
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Affiliation(s)
- Danila A Barskiy
- Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Stephan Knecht
- Eduard-Zintl Institute for Inorganic and Physical Chemistry, TU Darmstadt, Darmstadt 64287, Germany; Department of Radiology, Medical Physics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Alexandra V Yurkovskaya
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Konstantin L Ivanov
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
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18
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Rayner PJ, Tickner BJ, Iali W, Fekete M, Robinson AD, Duckett SB. Relayed hyperpolarization from para-hydrogen improves the NMR detectability of alcohols. Chem Sci 2019; 10:7709-7717. [PMID: 31588319 PMCID: PMC6764278 DOI: 10.1039/c9sc02765c] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 06/28/2019] [Indexed: 01/02/2023] Open
Abstract
The detection of alcohols by magnetic resonance techniques is important for their characterization and the monitoring of chemical change. Hyperpolarization processes can make previously inpractical measurements, such as the determination of low concentration intermediates, possible. Here, we investigate the SABRE-Relay method in order to define its key characteristics and improve the resulting 1H NMR signal gains which subsequently approach 103 per proton. We identify optimal amine proton transfer agents for SABRE-Relay and show how catalyst structure influences the outcome. The breadth of the method is revealed by expansion to more complex alcohols and the polarization of heteronuclei.
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Affiliation(s)
- Peter J Rayner
- Centre for Hyperpolarisation in Magnetic Resonance , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Ben J Tickner
- Centre for Hyperpolarisation in Magnetic Resonance , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Wissam Iali
- Centre for Hyperpolarisation in Magnetic Resonance , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Marianna Fekete
- Centre for Hyperpolarisation in Magnetic Resonance , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Alastair D Robinson
- Centre for Hyperpolarisation in Magnetic Resonance , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Simon B Duckett
- Centre for Hyperpolarisation in Magnetic Resonance , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
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19
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Ariyasingha NM, Lindale JR, Eriksson SL, Clark GP, Theis T, Shchepin RV, Chukanov NV, Kovtunov KV, Koptyug IV, Warren WS, Chekmenev EY. Quasi-Resonance Fluorine-19 Signal Amplification by Reversible Exchange. J Phys Chem Lett 2019; 10:4229-4236. [PMID: 31291106 PMCID: PMC6675627 DOI: 10.1021/acs.jpclett.9b01505] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We report on an extension of the quasi-resonance (QUASR) pulse sequence used for signal amplification by reversible exchange (SABRE), showing that we may target distantly J-coupled 19F-spins. Polarization transfer from the parahydrogen-derived hydrides to the 19F nucleus is accomplished via weak five-bond J-couplings using a shaped QUASR radio frequency pulse at a 0.05 T magnetic field. The net result is the direct generation of hyperpolarized 19F z-magnetization, derived from the parahydrogen singlet order. An accumulation of 19F polarization on the free ligand is achieved with subsequent repetition of this pulse sequence. The hyperpolarized 19F signal exhibits clear dependence on the pulse length, irradiation frequency, and delay time in a manner similar to that reported for 15N QUASR-SABRE. Moreover, the hyperpolarized 19F signals of 3-19F-14N-pyridine and 3-19F-15N-pyridine isotopologues are similar, suggesting that (i) polarization transfer via QUASR-SABRE is irrespective of the nitrogen isotopologue and (ii) the presence or absence of the spin-1/2 15N nucleus has no impact on the efficiency of QUASR-SABRE polarization transfer. Although optimization of polarization transfer efficiency to 19F (P19F ≈ 0.1%) was not the goal of this study, we show that high-field SABRE can be efficient and broadly applicable for direct hyperpolarization of 19F spins.
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Affiliation(s)
- Nuwandi M. Ariyasingha
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan, 48202, United States
| | - Jacob R. Lindale
- Duke University Department of Chemistry, Durham, North Carolina, 27708, United States
| | - Shannon L. Eriksson
- Duke University Department of Chemistry, Durham, North Carolina, 27708, United States
- Duke University School of Medicine, Durham, North Carolina, 27708, United States
| | - Grayson P. Clark
- Duke Department of Biomedical Engineering, Durham, North Carolina, 27708, United States
| | - Thomas Theis
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, United States
| | - Roman V. Shchepin
- Department of Chemistry and Applied Biological Sciences, South Dakota School of Mines and Technology, Rapid City, South Dakota, 57701, United States
| | - Nikita V. Chukanov
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Kirill V. Kovtunov
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Igor V. Koptyug
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Warren S. Warren
- Duke University Departments of Physics, Chemistry, Biomedical Engineering, and Radiology Durham, North Carolina, 27708, United States
| | - Eduard Y. Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan, 48202, United States
- Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow, 119991, Russia
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20
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Semenova O, Richardson PM, Parrott AJ, Nordon A, Halse ME, Duckett SB. Reaction Monitoring Using SABRE-Hyperpolarized Benchtop (1 T) NMR Spectroscopy. Anal Chem 2019; 91:6695-6701. [PMID: 30985110 PMCID: PMC6892580 DOI: 10.1021/acs.analchem.9b00729] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
![]()
The
conversion of [IrCl(COD)(IMes)] (COD = cis,cis-1,5-cyclooctadiene, IMes = 1,3-bis(2,4,6-trimethyl-phenyl)imidazole-2-ylidene)
in the presence of an excess of para-hydrogen (p-H2) and a substrate (4-aminopyridine (4-AP) or 4-methylpyridine (4-MP)) into [Ir(H)2(IMes)(substrate)3]Cl is monitored by 1H NMR spectroscopy using a benchtop (1 T) spectrometer in conjunction
with the p-H2-based hyperpolarization
technique signal amplification by reversible exchange (SABRE). A series
of single-shot 1H NMR measurements are used to monitor
the chemical changes that take place in solution through the lifetime
of the hyperpolarized response. Non-hyperpolarized high-field 1H NMR control measurements were also undertaken to confirm
that the observed time-dependent changes relate directly to the underlying
chemical evolution. The formation of [Ir(H)2(IMes)(substrate)3]Cl is further linked to the hydrogen isotope exchange (HIE)
reaction, which leads to the incorporation of deuterium into the ortho positions of 4-AP, where the source of
deuterium is the solvent, methanol-d4.
Comparable reaction monitoring results are achieved at both high-field
(9.4 T) and low-field (1 T). It is notable that the low sensitivity
of the benchtop (1 T) NMR enables the use of protio solvents, which when used here allows the effects of catalyst formation
and substrate deuteration to be separated. Collectively, these methods illustrate how low-cost low-field NMR
measurements provide unique insight into a complex catalytic process
through a combination of hyperpolarization and relaxation data.
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Affiliation(s)
- Olga Semenova
- Centre for Hyperpolarisation in Magnetic Resonance, Chemistry , The University of York , York YO10 5NY , U.K
| | - Peter M Richardson
- Centre for Hyperpolarisation in Magnetic Resonance, Chemistry , The University of York , York YO10 5NY , U.K
| | - Andrew J Parrott
- WestCHEM, Department of Pure and Applied Chemistry and CPACT , University of Strathclyde , Glasgow G11XQ , U.K
| | - Alison Nordon
- WestCHEM, Department of Pure and Applied Chemistry and CPACT , University of Strathclyde , Glasgow G11XQ , U.K
| | - Meghan E Halse
- Centre for Hyperpolarisation in Magnetic Resonance, Chemistry , The University of York , York YO10 5NY , U.K
| | - Simon B Duckett
- Centre for Hyperpolarisation in Magnetic Resonance, Chemistry , The University of York , York YO10 5NY , U.K
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21
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Knecht S, Ivanov KL. Quantitative quantum mechanical approach to SABRE hyperpolarization at high magnetic fields. J Chem Phys 2019; 150:124106. [DOI: 10.1063/1.5084129] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Stephan Knecht
- Eduard-Zintl Institute for Inorganic and Physical Chemistry, TU Darmstadt, Alarich-Weiss-Str. 8, D-64287 Darmstadt, Germany
- Medical Physics, Department of Radiology, Medical Center–University of Freiburg, Freiburg, Germany and Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Konstantin L. Ivanov
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
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22
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Manoharan A, Rayner PJ, Fekete M, Iali W, Norcott P, Hugh Perry V, Duckett SB. Catalyst-Substrate Effects on Biocompatible SABRE Hyperpolarization. Chemphyschem 2018; 20:285-294. [DOI: 10.1002/cphc.201800915] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/02/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Anand Manoharan
- University of York; Department of Chemistry Heslington; York YO10 5DD UK
| | - Peter J. Rayner
- University of York; Department of Chemistry Heslington; York YO10 5DD UK
| | - Marianna Fekete
- University of York; Department of Chemistry Heslington; York YO10 5DD UK
| | - Wissam Iali
- University of York; Department of Chemistry Heslington; York YO10 5DD UK
| | - Philip Norcott
- University of York; Department of Chemistry Heslington; York YO10 5DD UK
| | - V. Hugh Perry
- School of Biological Sciences; University of Southampton; Southampton UK
| | - Simon B. Duckett
- University of York; Department of Chemistry Heslington; York YO10 5DD UK
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23
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Stewart NJ, Kumeta H, Tomohiro M, Hashimoto T, Hatae N, Matsumoto S. Long-range heteronuclear J-coupling constants in esters: Implications for 13C metabolic MRI by side-arm parahydrogen-induced polarization. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 296:85-92. [PMID: 30223155 DOI: 10.1016/j.jmr.2018.08.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 08/28/2018] [Accepted: 08/28/2018] [Indexed: 06/08/2023]
Abstract
Side-arm parahydrogen induced polarization (PHIP-SAH) presents a cost-effective method for hyperpolarization of 13C metabolites (e.g. acetate, pyruvate) for metabolic MRI. The timing and efficiency of typical spin order transfer methods including magnetic field cycling and tailored RF pulse sequences crucially depends on the heteronuclear J coupling network between nascent parahydrogen protons and 13C, post-parahydrogenation of the target compound. In this work, heteronuclear nJHC (1 < n ≤ 5) couplings of acetate and pyruvate esters pertinent for PHIP-SAH were investigated experimentally using selective HSQMBC-based pulse sequences and numerically using DFT simulations. The CLIP-HSQMBC technique was used to quantify 2/3-bond JHC couplings, and 4/5-bond JHC ≲ 0.5 Hz were estimated by the sel-HSQMBC-TOCSY approach. Experimental and numerical (DFT-simulated) nJHC couplings were strongly correlated (P < 0.001). Implications for 13C hyperpolarization by magnetic field cycling, and PH-INEPT and ESOTHERIC type spin order transfer methods for PHIP-SAH were assessed, and the influence of direct nascent parahydrogen proton to 13C coupling when compared with indirect homonuclear TOCSY-type transfer through intermediate (non-nascent parahydrogen) protons was studied by the density matrix approach.
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Affiliation(s)
- Neil J Stewart
- Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan
| | - Hiroyuki Kumeta
- Department of Structural Biology, Faculty of Advanced Life Science, Hokkaido University, Sapporo, Japan; Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Japan
| | - Mitsushi Tomohiro
- Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan
| | - Takuya Hashimoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan; Department of Chemistry, Graduate School of Science, Chiba University, Chiba, Japan
| | - Noriyuki Hatae
- School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Japan
| | - Shingo Matsumoto
- Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan; JST, PREST, Saitama, Japan.
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24
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Rayner PJ, Norcott P, Appleby KM, Iali W, John RO, Hart SJ, Whitwood AC, Duckett SB. Fine-tuning the efficiency of para-hydrogen-induced hyperpolarization by rational N-heterocyclic carbene design. Nat Commun 2018; 9:4251. [PMID: 30315170 PMCID: PMC6185983 DOI: 10.1038/s41467-018-06766-1] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 09/24/2018] [Indexed: 11/24/2022] Open
Abstract
Iridium N-heterocyclic carbene (NHC) complexes catalyse the para-hydrogen-induced hyperpolarization process, Signal Amplification by Reversible Exchange (SABRE). This process transfers the latent magnetism of para-hydrogen into a substrate, without changing its chemical identity, to dramatically improve its nuclear magnetic resonance (NMR) detectability. By synthesizing and examining over 30 NHC containing complexes, here we rationalize the key characteristics of efficient SABRE catalysis prior to using appropriate catalyst-substrate combinations to quantify the substrate's NMR detectability. These optimizations deliver polarizations of 63% for 1H nuclei in methyl 4,6-d2-nicotinate, 25% for 13C nuclei in a 13C2-diphenylpyridazine and 43% for the 15N nucleus of pyridine-15N. These high detectability levels compare favourably with the 0.0005% 1H value harnessed by a routine 1.5 T clinical MRI system. As signal strength scales with the square of the number of observations, these low cost innovations offer remarkable improvements in detectability threshold that offer routes to significantly reduce measurement time.
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Affiliation(s)
- Peter J Rayner
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Philip Norcott
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Kate M Appleby
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Wissam Iali
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Richard O John
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Sam J Hart
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Adrian C Whitwood
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK
| | - Simon B Duckett
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, YO10 5NY, UK.
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Chukanov NV, Salnikov OG, Shchepin RV, Svyatova A, Kovtunov KV, Koptyug IV, Chekmenev EY. 19F Hyperpolarization of 15N-3- 19F-Pyridine Via Signal Amplification by Reversible Exchange. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2018; 122:23002-23010. [PMID: 31435456 PMCID: PMC6703844 DOI: 10.1021/acs.jpcc.8b06654] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We report synthesis of 15N-3-19F-pyridine via Zincke salt formation with the overall 35% yield and 84% 15N isotopic purity. Hyperpolarization studies of Signal Amplification by Reversible Exchange (SABRE) and SABRE in SHield Enables Alignment Transfer to Heteronuclei (SABRE-SHEATH) were performed to investigate the mechanism of polarization transfer from parahydrogen-derived hydride protons to 19F nucleus in milli-Tesla and micro-Tesla magnetic field regimes in 15N-3-19F-pyridine and 14N-3-19F-pyridine. We found the mismatch between 15N and 19F magnetic field hyperpolarization profiles in the micro-Tesla regime indicating that the spontaneous hyperpolarization process likely happens directly from parahydrogen-derived hydride protons to 19F nucleus without spin-relaying via 15N site. In case of SABRE magnetic field regime (milli-Tesla magnetic field range), we found that magnetic field profiles for 1H and 19F hyperpolarization are very similar, and 19F polarization levels are significantly lower than 1H SABRE polarization levels and lower than 19F SABRE-SHEATH (i.e. obtained at micro-Tesla magnetic field) polarization levels. Our findings support the hypothesis that in milli-Tesla magnetic field regime, the process of 19F nuclei hyperpolarization is relayed via protons of substrate, and therefore is very inefficient. These findings are important in the context of improvement of the hyperpolarization hardware and rational design of the hyperpolarized molecular probes.
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Affiliation(s)
- Nikita V. Chukanov
- International Tomography Center, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Oleg G. Salnikov
- International Tomography Center, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Roman V. Shchepin
- Vanderbilt University Institute of Imaging Science (VUIIS), Department of Radiology, Department of Biomedical Engineering, and Vanderbilt-Ingram Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Alexandra Svyatova
- International Tomography Center, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Kirill V. Kovtunov
- International Tomography Center, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Igor V. Koptyug
- International Tomography Center, 3A Institutskaya St., Novosibirsk 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
| | - Eduard Y. Chekmenev
- Vanderbilt University Institute of Imaging Science (VUIIS), Department of Radiology, Department of Biomedical Engineering, and Vanderbilt-Ingram Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan 48202, United States
- Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow 119991, Russia
- Corresponding Author
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26
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Wong CM, Fekete M, Nelson-Forde R, Gatus MRD, Rayner PJ, Whitwood AC, Duckett SB, Messerle BA. Harnessing asymmetric N-heterocyclic carbene ligands to optimise SABRE hyperpolarisation. Catal Sci Technol 2018; 8:4925-4933. [PMID: 30319759 PMCID: PMC6171487 DOI: 10.1039/c8cy01214h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 07/17/2018] [Indexed: 01/06/2023]
Abstract
The catalytic signal amplification by reversible exchange process has become widely used for the hyperpolarisation of small molecules to improve their magnetic resonance detectability. It harnesses the latent polarisation of parahydrogen, and involves the formation of a labile metal complex that often contains an N-heterocyclic carbene (NHC) ligand (e.g. [Ir(H)2(NHC)(pyridine)3]Cl), which act as a polarisation transfer catalyst. Unfortunately, if the target molecule is too bulky, binding to the catalyst is poor and the hyperpolarisation yield is therefore low. We illustrate here the behaviour of a series of asymmetric NHC containing catalysts towards 3,4- and 3,5-lutidine in order to show how catalyst design can be used to dramatically improve the outcome of this catalytic process for sterically encumbered ligands.
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Affiliation(s)
- Chin Min Wong
- School of Chemistry , University of New South Wales , Sydney 2052 , Australia
- Department of Molecular Sciences , Macquarie University , North Ryde 2109 , Australia .
| | - Marianna Fekete
- Centre for Hyperpolarisation in Magnetic Resonance , York Science Park , University of York , Heslington , York YO10 5NY , UK .
| | - Rhianna Nelson-Forde
- Centre for Hyperpolarisation in Magnetic Resonance , York Science Park , University of York , Heslington , York YO10 5NY , UK .
| | - Mark R D Gatus
- Department of Molecular Sciences , Macquarie University , North Ryde 2109 , Australia .
| | - Peter J Rayner
- Centre for Hyperpolarisation in Magnetic Resonance , York Science Park , University of York , Heslington , York YO10 5NY , UK .
| | - Adrian C Whitwood
- Centre for Hyperpolarisation in Magnetic Resonance , York Science Park , University of York , Heslington , York YO10 5NY , UK .
| | - Simon B Duckett
- Centre for Hyperpolarisation in Magnetic Resonance , York Science Park , University of York , Heslington , York YO10 5NY , UK .
| | - Barbara A Messerle
- Department of Molecular Sciences , Macquarie University , North Ryde 2109 , Australia .
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27
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Olaru AM, Burt A, Rayner PJ, Hart SJ, Whitwood AC, Green GGR, Duckett SB. Using signal amplification by reversible exchange (SABRE) to hyperpolarise 119Sn and 29Si NMR nuclei. Chem Commun (Camb) 2018; 52:14482-14485. [PMID: 27904890 PMCID: PMC5436037 DOI: 10.1039/c6cc07109k] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The hyperpolarisation of the 119Sn and 29Si nuclei in 5-(tributylstannyl)pyrimidine (ASn) and 5-(trimethylsilyl)pyrimidine (BSi) is achieved through their reaction with [IrCl(COD)(IMes)] (1a) or [IrCl(COD)(SIMes)] (1b) and parahydrogen via the SABRE process.
The hyperpolarisation of the 119Sn and 29Si nuclei in 5-(tributylstannyl)pyrimidine (ASn) and 5-(trimethylsilyl)pyrimidine (BSi) is achieved through their reaction with [IrCl(COD)(IMes)] (1a) or [IrCl(COD)(SIMes)] (1b) and parahydrogen via the SABRE process. 1a exhibits superior activity in both cases. The two inequivalent pyrimidine proton environments of ASn readily yielded signal enhancements totalling ∼2300-fold in its 1H NMR spectrum at a field strength of 9.4 T, with the corresponding 119Sn signal being 700 times stronger than normal. In contrast, BSi produced analogous 1H signal gains of ∼2400-fold and a 29Si signal that could be detected with a signal to noise ratio of 200 in a single scan. These sensitivity improvements allow NMR detection within seconds using micromole amounts of substrate and illustrate the analytical potential of this approach for high-sensitivity screening. Furthermore, after extended reaction times, a series of novel iridium trimers of general form [Ir(H)2Cl(NHC)(μ-pyrimidine-κN:κN′)]3 precipitate from these solutions whose identity was confirmed crystallographically for BSi.
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Affiliation(s)
- Alexandra M Olaru
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Alister Burt
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Peter J Rayner
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Sam J Hart
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Adrian C Whitwood
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Gary G R Green
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Simon B Duckett
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
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28
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Hermkens NKJ, Aspers RLEG, Feiters MC, Rutjes FPJT, Tessari M. Trace analysis in water-alcohol mixtures by continuous p-H 2 hyperpolarization at high magnetic field. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:633-640. [PMID: 29220098 DOI: 10.1002/mrc.4692] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/22/2017] [Accepted: 11/25/2017] [Indexed: 05/22/2023]
Abstract
Nuclear magnetic resonance (NMR) studies of complex mixtures are often limited by the low sensitivity of the technique and by spectral overlap. We have recently reported on an NMR chemosensor on the basis of para-Hydrogen Induced Polarization that potentially addresses both these issues, albeit for specific classes of compounds. This approach makes use of Signal Amplification By Reversible Exchange (SABRE) catalysts in methanol and allows selective detection and quantification of dilute analytes in complex mixtures. Herein, we demonstrate that, despite a large decrease in attained hyperpolarization, this method can be extended to water-alcohol mixtures. Our approach was tested on whisky, where nitrogenous heterocyclic flavor components at low-micromolar concentration could be detected and quantified.
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Affiliation(s)
- Niels K J Hermkens
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen, 6525AJ, The Netherlands
| | - Ruud L E G Aspers
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen, 6525AJ, The Netherlands
| | - Martin C Feiters
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen, 6525AJ, The Netherlands
| | - Floris P J T Rutjes
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen, 6525AJ, The Netherlands
| | - Marco Tessari
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen, 6525AJ, The Netherlands
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29
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Norcott P, Burns MJ, Rayner PJ, Mewis RE, Duckett SB. Using 2 H labelling to improve the NMR detectability of pyridine and its derivatives by SABRE. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:663-671. [PMID: 29274294 PMCID: PMC6001449 DOI: 10.1002/mrc.4703] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 12/07/2017] [Accepted: 12/10/2017] [Indexed: 05/08/2023]
Abstract
By introducing a range of 2 H labels into pyridine and the para-substituted agents, methyl isonicotinate and isonicotinamide, we significantly improve their NMR detectability in conjunction with the signal amplification by reversible exchange process. We describe how the rates of T1 relaxation for the remaining 1 H nuclei are increased and show how this leads to a concomitant increase in the level of 1 H and 13 C hyperpolarization that can ultimately be detected.
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Affiliation(s)
| | | | | | - Ryan E. Mewis
- Department of ChemistryUniversity of YorkYorkYO10 5DDUK
- Division of Chemistry and Environmental ScienceManchester Metropolitan UniversityManchesterGreater ManchesterUK
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30
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Kiryutin AS, Yurkovskaya AV, Zimmermann H, Vieth HM, Ivanov KL. Complete magnetic field dependence of SABRE-derived polarization. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:651-662. [PMID: 29230864 DOI: 10.1002/mrc.4694] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 11/09/2017] [Accepted: 11/29/2017] [Indexed: 05/22/2023]
Abstract
Signal amplification by reversible exchange (SABRE) is a promising hyperpolarization technique, which makes use of spin-order transfer from parahydrogen (the H2 molecule in its singlet spin state) to a to-be-polarized substrate in a transient organometallic complex, termed the SABRE complex. In this work, we present an experimental method for measuring the magnetic field dependence of the SABRE effect over an ultrawide field range, namely, from 10 nT to 10 T. This approach gives a way to determine the complete magnetic field dependence of SABRE-derived polarization. Here, we focus on SABRE polarization of spin-1/2 hetero-nuclei, such as 13 C and 15 N and measure their polarization in the entire accessible field range; experimental studies are supported by calculations of polarization. Features of the field dependence of polarization can be attributed to level anticrossings in the spin system of the SABRE complex. Features at magnetic fields of the order of 100 nT-1 μT correspond to "strong coupling" of protons and hetero-nuclei, whereas features found in the mT field range stem from "strong coupling" of the proton system. Our approach gives a way to measuring and analyzing the complete SABRE field dependence, to probing NMR parameters of SABRE complexes and to optimizing the polarization value.
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Affiliation(s)
- Alexey S Kiryutin
- International Tomography Center SB RAS, Novosibirsk, 630090, Russia
- Novosibirsk State University, Novosibirsk, 630090, Russia
| | - Alexandra V Yurkovskaya
- International Tomography Center SB RAS, Novosibirsk, 630090, Russia
- Novosibirsk State University, Novosibirsk, 630090, Russia
| | - Herbert Zimmermann
- Max-Planck-Institut für Medizinische Forschung, Dept. of Biomolecular Mechanisms, Jahnstrasse 29, Heidelberg, 69028, Germany
| | - Hans-Martin Vieth
- International Tomography Center SB RAS, Novosibirsk, 630090, Russia
- Freie Universität Berlin, Berlin, 14195, Germany
| | - Konstantin L Ivanov
- International Tomography Center SB RAS, Novosibirsk, 630090, Russia
- Novosibirsk State University, Novosibirsk, 630090, Russia
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31
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Rayner PJ, Duckett SB. Signal Amplification by Reversible Exchange (SABRE): From Discovery to Diagnosis. Angew Chem Int Ed Engl 2018; 57:6742-6753. [DOI: 10.1002/anie.201710406] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 12/12/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Peter J. Rayner
- Centre of Hyperpolarisation in Magnetic Resonance, Department of Chemistry; University of York; Heslington YO10 5DD UK
| | - Simon B. Duckett
- Centre of Hyperpolarisation in Magnetic Resonance, Department of Chemistry; University of York; Heslington YO10 5DD UK
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32
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Rayner PJ, Duckett SB. Signalverstärkung durch reversiblen Austausch (SABRE): von der Entdeckung zur diagnostischen Anwendung. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201710406] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Peter J. Rayner
- Centre of Hyperpolarisation in Magnetic Resonance, Department of Chemistry; University of York; Heslington YO10 5DD Großbritannien
| | - Simon B. Duckett
- Centre of Hyperpolarisation in Magnetic Resonance, Department of Chemistry; University of York; Heslington YO10 5DD Großbritannien
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33
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Iali W, Rayner PJ, Alshehri A, Holmes AJ, Ruddlesden AJ, Duckett SB. Direct and indirect hyperpolarisation of amines using parahydrogen. Chem Sci 2018; 9:3677-3684. [PMID: 29780498 PMCID: PMC5935062 DOI: 10.1039/c8sc00526e] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 03/06/2018] [Indexed: 01/13/2023] Open
Abstract
Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI) are two widely used techniques for the study of molecules and materials. Hyperpolarisation methods, such as Signal Amplification By Reversible Exchange (SABRE), turn typically weak magnetic resonance responses into strong signals. In this article we detail how it is possible to hyperpolarise the 1H, 13C and 15N nuclei of a range of amines. This involved showing how primary amines form stable but labile complexes of the type [Ir(H)2(IMes)(amine)3]Cl that allow parahydrogen to relay its latent polarisation into the amine. By optimising the temperature and parahydrogen pressure a 1000-fold per proton NH signal gain for deuterated benzylamine is achieved at 9.4 T. Additionally, we show that sterically hindered and electron poor amines that bind poorly to iridium can be hyperpolarised by either employing a co-ligand for complex stabilisation, or harnessing the fact that it is possible to exchange hyperpolarised protons between amines in a mixture, through the recently reported SABRE-RELAY method. These chemical refinements have significant potential to extend the classes of agent that can be hyperpolarised by readily accessible parahydrogen.
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Affiliation(s)
- Wissam Iali
- Centre for Hyperpolarisation in Magnetic Resonance (CHyM) , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Peter J Rayner
- Centre for Hyperpolarisation in Magnetic Resonance (CHyM) , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Adel Alshehri
- Centre for Hyperpolarisation in Magnetic Resonance (CHyM) , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - A Jonathan Holmes
- Centre for Hyperpolarisation in Magnetic Resonance (CHyM) , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Amy J Ruddlesden
- Centre for Hyperpolarisation in Magnetic Resonance (CHyM) , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
| | - Simon B Duckett
- Centre for Hyperpolarisation in Magnetic Resonance (CHyM) , Department of Chemistry , University of York , Heslington , YO10 5DD , UK .
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34
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Manoharan A, Rayner PJ, Iali W, Burns MJ, Perry VH, Duckett SB. Achieving Biocompatible SABRE: An in vitro Cytotoxicity Study. ChemMedChem 2018; 13:352-359. [PMID: 29232489 PMCID: PMC5838797 DOI: 10.1002/cmdc.201700725] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Indexed: 01/09/2023]
Abstract
Production of a biocompatible hyperpolarized bolus for signal amplification by reversible exchange (SABRE) could open the door to simple clinical diagnosis via magnetic resonance imaging. Essential to successful progression to preclinical/clinical applications is the determination of the toxicology profile of the SABRE reaction mixture. Herein, we exemplify the cytotoxicity of the SABRE approach using in vitro cell assays. We conclude that the main cause of the observed toxicity is due to the SABRE catalyst. We therefore illustrate two catalyst removal methods: one involving deactivation and ion-exchange chromatography, and the second using biphasic catalysis. These routes produce a bolus suitable for future in vivo study.
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Affiliation(s)
- Anand Manoharan
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Peter J. Rayner
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Wissam Iali
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Michael J. Burns
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - V. Hugh Perry
- School of Biological SciencesUniversity of SouthamptonSouthamptonUK
| | - Simon B. Duckett
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
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35
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Knecht S, Kiryutin AS, Yurkovskaya AV, Ivanov KL. Re-polarization of nuclear spins using selective SABRE-INEPT. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 287:10-14. [PMID: 29274936 DOI: 10.1016/j.jmr.2017.12.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 12/10/2017] [Accepted: 12/12/2017] [Indexed: 05/22/2023]
Abstract
A method is proposed for significant improvement of NMR pulse sequences used in high-field SABRE (Signal Amplification By Reversible Exchange) experiments. SABRE makes use of spin order transfer from parahydrogen (pH2, the H2 molecule in its singlet spin state) to a substrate in a transient organometallic Ir-based complex. The technique proposed here utilizes "re-polarization", i.e., multiple application of an NMR pulse sequence used for spin order transfer. During re-polarization only the form of the substrate, which is bound to the complex, is excited by selective NMR pulses and the resulting polarization is transferred to the free substrate via chemical exchange. Owing to the fact that (i) only a small fraction of the substrate molecules is in the bound form and (ii) spin relaxation of the free substrate is slow, the re-polarization scheme provides greatly improved NMR signal enhancement, ε. For instance, when pyridine is used as a substrate, single use of the SABRE-INEPT sequence provides ε≈260 for 15N nuclei, whereas SABRE-INEPT with re-polarization yields ε>2000. We anticipate that the proposed method is useful for achieving maximal NMR enhancement with spin hyperpolarization techniques.
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Affiliation(s)
- Stephan Knecht
- Dept. of Radiology, Medical Physics, Medical Center Freiburg-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Alexey S Kiryutin
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexandra V Yurkovskaya
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Konstantin L Ivanov
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
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36
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Iali W, Rayner PJ, Duckett SB. Using parahydrogen to hyperpolarize amines, amides, carboxylic acids, alcohols, phosphates, and carbonates. SCIENCE ADVANCES 2018; 4:eaao6250. [PMID: 29326984 PMCID: PMC5756661 DOI: 10.1126/sciadv.aao6250] [Citation(s) in RCA: 97] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 11/29/2017] [Indexed: 05/19/2023]
Abstract
Hyperpolarization turns weak nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) responses into strong signals, so normally impractical measurements are possible. We use parahydrogen to rapidly hyperpolarize appropriate 1H, 13C, 15N, and 31P responses of analytes (such as NH3) and important amines (such as phenylethylamine), amides (such as acetamide, urea, and methacrylamide), alcohols spanning methanol through octanol and glucose, the sodium salts of carboxylic acids (such as acetic acid and pyruvic acid), sodium phosphate, disodium adenosine 5'-triphosphate, and sodium hydrogen carbonate. The associated signal gains are used to demonstrate that it is possible to collect informative single-shot NMR spectra of these analytes in seconds at the micromole level in a 9.4-T observation field. To achieve these wide-ranging signal gains, we first use the signal amplification by reversible exchange (SABRE) process to hyperpolarize an amine or ammonia and then use their exchangeable NH protons to relay polarization into the analyte without changing its identity. We found that the 1H signal gains reach as high as 650-fold per proton, whereas for 13C, the corresponding signal gains achieved in a 1H-13C refocused insensitive nuclei enhanced by polarization transfer (INEPT) experiment exceed 570-fold and those in a direct-detected 13C measurement exceed 400-fold. Thirty-one examples are described to demonstrate the applicability of this technique.
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Shchepin RV, Jaigirdar L, Theis T, Warren WS, Goodson BM, Chekmenev EY. Spin Relays Enable Efficient Long-Range Heteronuclear Signal Amplification By Reversible Exchange. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:28425-28434. [PMID: 29955243 PMCID: PMC6017995 DOI: 10.1021/acs.jpcc.7b11485] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A systematic experimental study is reported on the polarization transfer to distant spins, which do not directly bind to the polarization transfer complexes employed in Signal Amplification By Reversible Exchange (SABRE) experiments. Both, long-range transfer to protons and long-range transfer to heteronuclei i.e. 13C and 15N are examined. Selective destruction of hyperpolarization on 1H, 13C, and 15N sites is employed, followed by their re-hyperpolarization from neighboring spins within the molecules of interest (pyridine for 1H studies and metronidazole-15N2-13C2 for 13C and 15N studies). We conclude that long-range sites can be efficiently hyperpolarized when a network of spin-½ nuclei enables relayed polarization transfer (i.e. via short-range interactions between sites). In case of proton SABRE in the milli-Tesla regime, a relay network consisting of protons only is sufficient. However, in case 13C and 15N are targeted (i.e. via SABRE in SHield Enables Alignment Transfer to Heteronuclei or SABRE-SHEATH experiment), the presence of a heteronuclear network (e.g. consisting of 15N) enables a relay mechanism that is significantly more efficient than the direct transfer of spin order from para-H2-derived hydrides.
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Affiliation(s)
- Roman V. Shchepin
- Vanderbilt University Institute of Imaging Science (VUIIS), Department of Radiology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee 37232-2310 United States
| | - Lamya Jaigirdar
- Vanderbilt University Institute of Imaging Science (VUIIS), Department of Radiology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee 37232-2310 United States
- Vanderbilt University, School of Engineering, Nashville, Tennessee 37232 United States
| | - Thomas Theis
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Warren S. Warren
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Boyd M. Goodson
- Department of Chemistry and Biochemistry and Materials Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Eduard Y. Chekmenev
- Vanderbilt University Institute of Imaging Science (VUIIS), Department of Radiology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee 37232-2310 United States
- Department of Biomedical Engineering, Vanderbilt University, Vanderbilt-Ingram Cancer Center (VICC), Nashville, Tennessee 37232-2310, United States
- Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow, 119991, Russia
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Achieving High 1
H Nuclear Hyperpolarization Levels with Long Lifetimes in a Range of Tuberculosis Drug Scaffolds. Chemistry 2017; 23:16990-16997. [DOI: 10.1002/chem.201703278] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Indexed: 12/22/2022]
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Fekete M, Rayner PJ, Green GGR, Duckett SB. Harnessing polarisation transfer to indazole and imidazole through signal amplification by reversible exchange to improve their NMR detectability. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2017; 55:944-957. [PMID: 28497481 PMCID: PMC5599957 DOI: 10.1002/mrc.4607] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/25/2017] [Accepted: 05/07/2017] [Indexed: 05/24/2023]
Abstract
The signal amplification by reversible exchange (SABRE) approach has been used to hyperpolarise the substrates indazole and imidazole in the presence of the co-ligand acetonitrile through the action of the precataysts [IrCl(COD)(IMes)] and [IrCl(COD)(SIMes)]. 2 H-labelled forms of these catalysts were also examined. Our comparison of the two precatalysts [IrCl(COD)(IMes)] and [IrCl(COD)(SIMes)], coupled with 2 H labelling of the N-heterocyclic carbene and associated relaxation and polarisation field variation studies, demonstrates the critical and collective role these parameters play in controlling the efficiency of signal amplification by reversible exchange. Ultimately, with imidazole, a 700-fold1 H signal gain per proton is produced at 400 MHz, whilst for indazole, a 90-fold increase per proton is achieved. The co-ligand acetonitrile proved to optimally exhibit a 190-fold signal gain per proton in these measurements, with the associated studies revealing the importance the substrate plays in controlling this value. Copyright © 2017 The Authors. Magnetic Resonance in Chemistry published by John Wiley & Sons Ltd.
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Affiliation(s)
- Marianna Fekete
- Centre for Hyperpolarization in Magnetic Resonance, Department of ChemistryUniversity of YorkYorkYO10 5NYUK
| | - Peter J. Rayner
- Centre for Hyperpolarization in Magnetic Resonance, Department of ChemistryUniversity of YorkYorkYO10 5NYUK
| | - Gary G. R. Green
- Centre for Hyperpolarization in Magnetic Resonance, Department of ChemistryUniversity of YorkYorkYO10 5NYUK
| | - Simon B. Duckett
- Centre for Hyperpolarization in Magnetic Resonance, Department of ChemistryUniversity of YorkYorkYO10 5NYUK
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Delivering strong 1H nuclear hyperpolarization levels and long magnetic lifetimes through signal amplification by reversible exchange. Proc Natl Acad Sci U S A 2017; 114:E3188-E3194. [PMID: 28377523 DOI: 10.1073/pnas.1620457114] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Hyperpolarization turns typically weak NMR and MRI responses into strong signals so that ordinarily impractical measurements become possible. The potential to revolutionize analytical NMR and clinical diagnosis through this approach reflect this area's most compelling outcomes. Methods to optimize the low-cost parahydrogen-based approach signal amplification by reversible exchange with studies on a series of biologically relevant nicotinamides and methyl nicotinates are detailed. These procedures involve specific 2H labeling in both the agent and catalyst and achieve polarization lifetimes of ca 2 min with 50% polarization in the case of methyl-4,6-d2 -nicotinate. Because a 1.5-T hospital scanner has an effective 1H polarization level of just 0.0005% this strategy should result in compressed detection times for chemically discerning measurements that probe disease. To demonstrate this technique's generality, we exemplify further studies on a range of pyridazine, pyrimidine, pyrazine, and isonicotinamide analogs that feature as building blocks in biochemistry and many disease-treating drugs.
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Hermkens NKJ, Feiters MC, Rutjes FPJT, Wijmenga SS, Tessari M. High field hyperpolarization-EXSY experiment for fast determination of dissociation rates in SABRE complexes. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2017; 276:122-127. [PMID: 28183024 DOI: 10.1016/j.jmr.2017.01.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 01/16/2017] [Accepted: 01/17/2017] [Indexed: 06/06/2023]
Abstract
SABRE (Signal Amplification By Reversible Exchange) is a nuclear spin hyperpolarization technique based on the reversible concurrent binding of small molecules and para-hydrogen (p-H2) to an iridium metal complex in solution. At low magnetic field, spontaneous conversion of p-H2 spin order to enhanced longitudinal magnetization of the nuclear spins of the other ligands occurs. Subsequent complex dissociation results in hyperpolarized substrate molecules in solution. The lifetime of this complex plays a crucial role in attained SABRE NMR signal enhancements. Depending on the ligands, vastly different dissociation rates have been previously measured using EXSY or selective inversion experiments. However, both these approaches are generally time-consuming due to the long recycle delays (up to 2min) necessary to reach thermal equilibrium for the nuclear spins of interest. In the cases of dilute solutions, signal averaging aggravates the problem, further extending the experimental time. Here, a new approach is proposed based on coherent hyperpolarization transfer to substrate protons in asymmetric complexes at high magnetic field. We have previously shown that such asymmetric complexes are important for application of SABRE to dilute substrates. Our results demonstrate that a series of high sensitivity EXSY spectra can be collected in a short experimental time thanks to the NMR signal enhancement and much shorter recycle delay.
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Affiliation(s)
- Niels K J Hermkens
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
| | - Martin C Feiters
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
| | - Floris P J T Rutjes
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
| | - Sybren S Wijmenga
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
| | - Marco Tessari
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
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Iali W, Green GGR, Hart SJ, Whitwood AC, Duckett SB. Iridium Cyclooctene Complex That Forms a Hyperpolarization Transfer Catalyst before Converting to a Binuclear C-H Bond Activation Product Responsible for Hydrogen Isotope Exchange. Inorg Chem 2016; 55:11639-11643. [PMID: 27934314 PMCID: PMC5193467 DOI: 10.1021/acs.inorgchem.6b02560] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Indexed: 11/28/2022]
Abstract
[IrCl(COE)2]2 (1) reacts with pyridine (py) and H2 to form crystallographically characterized IrCl(H)2(COE)(py)2 (2). 2 undergoes py loss to form 16-electron IrCl(H)2(COE)(py) (3), with equivalent hydride ligands. When this reaction is studied with parahydrogen, 1 efficiently achieves hyperpolarization of free py (and nicotinamide, nicotine, 5-aminopyrimidine, and 3,5-lutudine) via signal amplification by reversible exchange (SABRE) and hence reflects a simple and readily available precatayst for this process. 2 reacts further over 48 h at 298 K to form crystallographically characterized (Cl)(H)(py)(μ-Cl)(μ-H)(κ-μ-NC5H4)Ir(H)(py)2 (4). This dimer is active in the hydrogen isotope exchange process that is used in radiopharmaceutical preparations. Furthermore, while [Ir(H)2(COE)(py)3]PF6 (6) forms upon the addition of AgPF6 to 2, its stability precludes its efficient involvement in SABRE.
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Affiliation(s)
- Wissam Iali
- Centre for Hyperpolarization in
Magnetic Resonance, University of York, York YO10 3NR, U.K.
| | - Gary G. R. Green
- Centre for Hyperpolarization in
Magnetic Resonance, University of York, York YO10 3NR, U.K.
| | - Sam J. Hart
- Centre for Hyperpolarization in
Magnetic Resonance, University of York, York YO10 3NR, U.K.
| | - Adrian C. Whitwood
- Centre for Hyperpolarization in
Magnetic Resonance, University of York, York YO10 3NR, U.K.
| | - Simon B. Duckett
- Centre for Hyperpolarization in
Magnetic Resonance, University of York, York YO10 3NR, U.K.
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Pravdivtsev AN, Yurkovskaya AV, Zimmermann H, Vieth HM, Ivanov KL. Enhancing NMR of insensitive nuclei by transfer of SABRE spin hyperpolarization. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.08.037] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Shchepin RV, Barskiy DA, Coffey AM, Goodson BM, Chekmenev EY. NMR Signal Amplification by Reversible Exchange of Sulfur-Heterocyclic Compounds Found In Petroleum. ChemistrySelect 2016; 1:2552-2555. [PMID: 27500206 DOI: 10.1002/slct.201600761] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
NMR hyperpolarization via Signal Amplification by Reversible Exchange (SABRE) was employed to investigate the feasibility of enhancing the NMR detection sensitivity of sulfur-heterocycles (specifically 2-methylthiophene and dibenzothiophenes), a family of compounds typically found in petroleum and refined petroleum products. SABRE hyperpolarization of sulfur-heterocycles (conducted in seconds) offers potential advantages of providing structural information about sulfur-containing contaminants in petroleum, thereby informing petroleum purification and refining to minimize sulfur content in refined products such as gasoline. Moreover, NMR spectroscopy sensitivity gains endowed by hyperpolarization potentially allows for performing structural assays using inexpensive, low-magnetic-field (ca. 1 T) high-resolution NMR spectrometers ideally suited for industrial applications in the field.
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Affiliation(s)
- Roman V Shchepin
- Department of Radiology, Vanderbilt University Institute of Imaging Science (VUIIS), Department of Biomedical Engineering, Vanderbilt-Ingram Cancer Center (VICC), Vanderbilt University, Nashville, TN 37232 USA
| | - Danila A Barskiy
- Department of Radiology, Vanderbilt University Institute of Imaging Science (VUIIS), Department of Biomedical Engineering, Vanderbilt-Ingram Cancer Center (VICC), Vanderbilt University, Nashville, TN 37232 USA
| | - Aaron M Coffey
- Department of Radiology, Vanderbilt University Institute of Imaging Science (VUIIS), Department of Biomedical Engineering, Vanderbilt-Ingram Cancer Center (VICC), Vanderbilt University, Nashville, TN 37232 USA
| | - Boyd M Goodson
- Southern Illinois University, Department of Chemistry and Biochemistry, Materials Technology Center, Carbondale, IL 62901 USA
| | - Eduard Y Chekmenev
- Department of Radiology, Vanderbilt University Institute of Imaging Science (VUIIS), Department of Biomedical Engineering, Vanderbilt-Ingram Cancer Center (VICC), Vanderbilt University, Nashville, TN 37232 USA.,Russian Academy of Sciences, 119991 Moscow Russia
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Barskiy DA, Shchepin RV, Coffey AM, Theis T, Warren WS, Goodson BM, Chekmenev EY. Over 20% (15)N Hyperpolarization in Under One Minute for Metronidazole, an Antibiotic and Hypoxia Probe. J Am Chem Soc 2016; 138:8080-3. [PMID: 27321159 PMCID: PMC4937835 DOI: 10.1021/jacs.6b04784] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Direct NMR hyperpolarization of naturally abundant (15)N sites in metronidazole is demonstrated using SABRE-SHEATH (Signal Amplification by Reversible Exchange in SHield Enables Alignment Transfer to Heteronuclei). In only a few tens of seconds, nuclear spin polarization P(15)N of up to ∼24% is achieved using parahydrogen with 80% para fraction corresponding to P(15)N ≈ 32% if ∼100% parahydrogen were employed (which would translate to a signal enhancement of ∼0.1-million-fold at 9.4 T). In addition to this demonstration on the directly binding (15)N site (using J(2)H-(15)N), we also hyperpolarized more distant (15)N sites in metronidazole using longer-range spin-spin couplings (J(4)H-(15)N and J(5)H-(15)N). Taken together, these results significantly expand the range of molecular structures and sites amenable to hyperpolarization via low-cost parahydrogen-based methods. In particular, hyperpolarized nitroimidazole and its derivatives have powerful potential applications such as direct in vivo imaging of mechanisms of action or hypoxia sensing.
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Affiliation(s)
- Danila A Barskiy
- Department of Radiology, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center , Nashville, Tennessee 37232, United States
| | - Roman V Shchepin
- Department of Radiology, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center , Nashville, Tennessee 37232, United States
| | - Aaron M Coffey
- Department of Radiology, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center , Nashville, Tennessee 37232, United States
| | - Thomas Theis
- Department of Chemistry, Duke University , Durham, North Carolina 27708, United States
| | - Warren S Warren
- Department of Chemistry, Duke University , Durham, North Carolina 27708, United States
| | - Boyd M Goodson
- Department of Chemistry and Biochemistry and Materials Technology Center, Southern Illinois University , Carbondale, Illinois 62901, United States
| | - Eduard Y Chekmenev
- Department of Radiology, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center , Nashville, Tennessee 37232, United States.,Department of Biomedical Engineering, Vanderbilt-Ingram Cancer Center, Vanderbilt University , Nashville, Tennessee 37232, United States.,Russian Academy of Sciences , Leninskiy Prospekt 14, Moscow 119991, Russia
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Hermkens NKJ, Eshuis N, van Weerdenburg BJA, Feiters MC, Rutjes FPJT, Wijmenga SS, Tessari M. NMR-Based Chemosensing via p-H2 Hyperpolarization: Application to Natural Extracts. Anal Chem 2016; 88:3406-12. [PMID: 26901632 DOI: 10.1021/acs.analchem.6b00184] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
When dealing with trace analysis of complex mixtures, NMR suffers from both low sensitivity and signal overlap. NMR chemosensing, in which the association between an analyte and a receptor is "signaled" by an NMR response, has been proposed as a valuable analytical tool for biofluids and natural extracts. Such chemosensors offer the possibility to simultaneously detect and distinguish different analytes in solution, which makes them particularly suitable for analytical applications on complex mixtures. In this study, we have combined NMR chemosensing with nuclear spin hyperpolarization. This was realized using an iridium complex as a receptor in the presence of parahydrogen: association of the target analytes to the metal center results in approximately 1000-fold enhancement of the NMR response. This amplification allows the detection, identification, and quantification of analytes at low-micromolar concentrations, provided they can weakly associate to the iridium chemosensor. Here, our NMR chemosensing approach was applied to the quantitative determination of several flavor components in methanol extracts of ground coffee.
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Affiliation(s)
- Niels K J Hermkens
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Nan Eshuis
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Bram J A van Weerdenburg
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Martin C Feiters
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Floris P J T Rutjes
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Sybren S Wijmenga
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Marco Tessari
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
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