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Pravdivtsev AN, Yurkovskaya AV, Vieth HM, Ivanov KL. RF-SABRE: A Way to Continuous Spin Hyperpolarization at High Magnetic Fields. J Phys Chem B 2015; 119:13619-29. [DOI: 10.1021/acs.jpcb.5b03032] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Andrey N. Pravdivtsev
- International
Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova
2, Novosibirsk, 630090, Russia
| | - Alexandra V. Yurkovskaya
- International
Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova
2, Novosibirsk, 630090, Russia
| | - Hans-Martin Vieth
- Institut
für Experimentalphysik, Freie Universität of Berlin, Arnimallee
14, Berlin, 14195, Germany
| | - Konstantin L. Ivanov
- International
Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova
2, Novosibirsk, 630090, Russia
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Truong M, Theis T, Coffey AM, Shchepin RV, Waddell KW, Shi F, Goodson BM, Warren W, Chekmenev EY. 15N Hyperpolarization by Reversible Exchange Using SABRE-SHEATH. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2015; 119:8786-8797. [PMID: 25960823 PMCID: PMC4419867 DOI: 10.1021/acs.jpcc.5b01799] [Citation(s) in RCA: 182] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/28/2015] [Indexed: 05/14/2023]
Abstract
NMR signal amplification by reversible exchange (SABRE) is a NMR hyperpolarization technique that enables nuclear spin polarization enhancement of molecules via concurrent chemical exchange of a target substrate and parahydrogen (the source of spin order) on an iridium catalyst. Recently, we demonstrated that conducting SABRE in microtesla fields provided by a magnetic shield enables up to 10% 15N-polarization (Theis, T.; et al. J. Am. Chem. Soc.2015, 137, 1404). Hyperpolarization on 15N (and heteronuclei in general) may be advantageous because of the long-lived nature of the hyperpolarization on 15N relative to the short-lived hyperpolarization of protons conventionally hyperpolarized by SABRE, in addition to wider chemical shift dispersion and absence of background signal. Here we show that these unprecedented polarization levels enable 15N magnetic resonance imaging. We also present a theoretical model for the hyperpolarization transfer to heteronuclei, and detail key parameters that should be optimized for efficient 15N-hyperpolarization. The effects of parahydrogen pressure, flow rate, sample temperature, catalyst-to-substrate ratio, relaxation time (T1), and reversible oxygen quenching are studied on a test system of 15N-pyridine in methanol-d4. Moreover, we demonstrate the first proof-of-principle 13C-hyperpolarization using this method. This simple hyperpolarization scheme only requires access to parahydrogen and a magnetic shield, and it provides large enough signal gains to enable one of the first 15N images (2 × 2 mm2 resolution). Importantly, this method enables hyperpolarization of molecular sites with NMR T1 relaxation times suitable for biomedical imaging and spectroscopy.
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Affiliation(s)
- Milton
L. Truong
- Institute of Imaging Science, Department of Radiology, Department of Biomedical
Engineering, Department of Physics and Astronomy, Department of Biochemistry, and Vanderbilt-Ingram
Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Thomas Theis
- Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Aaron M. Coffey
- Institute of Imaging Science, Department of Radiology, Department of Biomedical
Engineering, Department of Physics and Astronomy, Department of Biochemistry, and Vanderbilt-Ingram
Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Roman V. Shchepin
- Institute of Imaging Science, Department of Radiology, Department of Biomedical
Engineering, Department of Physics and Astronomy, Department of Biochemistry, and Vanderbilt-Ingram
Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Kevin W. Waddell
- Institute of Imaging Science, Department of Radiology, Department of Biomedical
Engineering, Department of Physics and Astronomy, Department of Biochemistry, and Vanderbilt-Ingram
Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Fan Shi
- Department of Chemistry and Biochemistry and Materials Technology
Center, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Boyd M. Goodson
- Department of Chemistry and Biochemistry and Materials Technology
Center, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Warren
S. Warren
- Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Eduard Y. Chekmenev
- Institute of Imaging Science, Department of Radiology, Department of Biomedical
Engineering, Department of Physics and Astronomy, Department of Biochemistry, and Vanderbilt-Ingram
Cancer Center (VICC), Vanderbilt University, Nashville, Tennessee 37232-2310, United States
- E-mail:
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Shi F, Coffey A, Waddell KW, Chekmenev EY, Goodson BM. Nanoscale Catalysts for NMR Signal Enhancement by Reversible Exchange. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2015; 119:7525-7533. [PMID: 26185545 PMCID: PMC4501382 DOI: 10.1021/acs.jpcc.5b02036] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 03/11/2015] [Indexed: 05/24/2023]
Abstract
Two types of nanoscale catalysts were created to explore NMR signal enhancement via reversible exchange (SABRE) at the interface between heterogeneous and homogeneous conditions. Nanoparticle and polymer comb variants were synthesized by covalently tethering Ir-based organometallic catalysts to support materials comprised of TiO2/PMAA (poly methacrylic acid) and PVP (polyvinyl pyridine), respectively, and characterized by AAS, NMR, and DLS. Following parahydrogen (pH2) gas delivery to mixtures containing one type of "nano-SABRE" catalyst particles, a target substrate, and ethanol, up to ~(-)40-fold and ~(-)7-fold 1H NMR signal enhancements were observed for pyridine substrates using the nanoparticle and polymer comb catalysts, respectively, following transfer to high field (9.4 T). These enhancements appear to result from intact particles and not from any catalyst molecules leaching from their supports; unlike the case with homogeneous SABRE catalysts, high-field (in situ) SABRE effects were generally not observed with the nanoscale catalysts. The potential for separation and reuse of such catalyst particles is also demonstrated. Taken together, these results support the potential utility of rational design at molecular, mesoscopic, and macroscopic/engineering levels for improving SABRE and HET-SABRE (heterogeneous-SABRE) for applications varying from fundamental studies of catalysis to biomedical imaging.
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Affiliation(s)
- Fan Shi
- Department
of Chemistry and Biochemistry, Southern
Illinois University, Carbondale, Illinois 62901, United States
| | - Aaron
M. Coffey
- Institute of Imaging
Science, Department of Radiology, Department of Physics, Department of Biomedical
Engineering, Vanderbilt-Ingram Cancer Center (VICC), and Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Kevin W. Waddell
- Institute of Imaging
Science, Department of Radiology, Department of Physics, Department of Biomedical
Engineering, Vanderbilt-Ingram Cancer Center (VICC), and Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Eduard Y. Chekmenev
- Institute of Imaging
Science, Department of Radiology, Department of Physics, Department of Biomedical
Engineering, Vanderbilt-Ingram Cancer Center (VICC), and Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232-2310, United States
| | - Boyd M. Goodson
- Department
of Chemistry and Biochemistry, Southern
Illinois University, Carbondale, Illinois 62901, United States
- Materials
Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
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