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Zhukov IV, Kiryutin AS, Yurkovskaya AV, Blanchard JW, Budker D, Ivanov KL. Correlation of high-field and zero- to ultralow-field NMR properties using 2D spectroscopy. J Chem Phys 2021; 154:144201. [DOI: 10.1063/5.0039294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ivan V. Zhukov
- International Tomography Center, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexey S. Kiryutin
- International Tomography Center, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexandra V. Yurkovskaya
- International Tomography Center, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - John W. Blanchard
- NVision-Imaging Technologies, Ulm 89081, Germany
- Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
- Helmholtz-Institut, GSI Helmholtzzentrum für Schwerionenforschung, 55128 Mainz, Germany
| | - Dmitry Budker
- Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
- Helmholtz-Institut, GSI Helmholtzzentrum für Schwerionenforschung, 55128 Mainz, Germany
- Department of Physics, University of California, Berkeley, California 94720, USA
| | - Konstantin L. Ivanov
- International Tomography Center, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
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2
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Bolik-Coulon N, Kadeřávek P, Pelupessy P, Dumez JN, Ferrage F, Cousin SF. Theoretical and computational framework for the analysis of the relaxation properties of arbitrary spin systems. Application to high-resolution relaxometry. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 313:106718. [PMID: 32234674 DOI: 10.1016/j.jmr.2020.106718] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/11/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
A wide variety of nuclear magnetic resonance experiments rely on the prediction and analysis of relaxation processes. Recently, innovative approaches have been introduced where the sample travels through a broad range of magnetic fields in the course of the experiment, such as dissolution dynamic nuclear polarization or high-resolution relaxometry. Understanding the relaxation properties of nuclear spin systems over orders of magnitude of magnetic fields is essential to rationalize the results of these experiments. For example, during a high-resolution relaxometry experiment, the absence of control of nuclear spin relaxation pathways during the sample transfers and relaxation delays leads to systematic deviations of polarization decays from an ideal mono-exponential decay with the pure longitudinal relaxation rate. These deviations have to be taken into account to describe quantitatively the dynamics of the system. Here, we present computational tools to (1) calculate analytical expressions of relaxation rates for a broad variety of spin systems and (2) use these analytical expressions to correct the deviations arising in high-resolution relaxometry experiments. These tools lead to a better understanding of nuclear spin relaxation, which is required to improve the sensitivity of many pulse sequences, and to better characterize motions in macromolecules.
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Affiliation(s)
- Nicolas Bolik-Coulon
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
| | - Pavel Kadeřávek
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Philippe Pelupessy
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | | | - Fabien Ferrage
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
| | - Samuel F Cousin
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
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3
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Pravdivtsev AN, Hövener JB. Simulating Non-linear Chemical and Physical (CAP) Dynamics of Signal Amplification By Reversible Exchange (SABRE). Chemistry 2019; 25:7659-7668. [PMID: 30689237 DOI: 10.1002/chem.201806133] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 01/18/2019] [Indexed: 01/30/2023]
Abstract
The hyperpolarization of nuclear spins by using parahydrogen (pH2 ) is a fascinating technique that allows spin polarization and thus the magnetic resonance signal to be increased by several orders of magnitude. Entirely new applications have become available. Signal amplification by reversible exchange (SABRE) is a relatively new method that is based on the reversible exchange of a substrate, catalyst and parahydrogen. SABRE is particularly interesting for in vivo medical and industrial applications, such as fast and low-cost trace analysis or continuous signal enhancement. Ever since its discovery, many attempts have been made to model and understand SABRE, with various degrees of simplifications. In this work, we reduced the simplifications further, taking into account non-linear chemical and physical (CAP) dynamics of several multi-spin systems. A master equation was derived and realized using the MOIN open-source software. The effects of different parameters (exchange rates, concentrations, spin-spin couplings) on relaxation and the polarization level have been evaluated and the results provide interesting insights into the mechanism of SABRE.
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Affiliation(s)
- Andrey N Pravdivtsev
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Schleswig-Holstein (UKSH), Kiel University, Am Botanischen Garten 14, 24118, Kiel, Germany
| | - Jan-Bernd Hövener
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Schleswig-Holstein (UKSH), Kiel University, Am Botanischen Garten 14, 24118, Kiel, Germany
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4
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Kiryutin AS, Panov MS, Yurkovskaya AV, Ivanov KL, Bodenhausen G. Proton Relaxometry of Long-Lived Spin Order. Chemphyschem 2019; 20:766-772. [PMID: 30600920 DOI: 10.1002/cphc.201800960] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/28/2018] [Indexed: 11/06/2022]
Abstract
A study of long-lived spin order in chlorothiophene carboxylates at both high and low magnetic fields is presented. Careful sample preparation (removal of dissolved oxygen in solution, chelating of paramagnetic impurities, reduction of convection) allows one to obtain very long-lived singlet order of the two coupled protons in chlorothiophene derivatives, having lifetimes of about 130 s in D2 O and 240 s in deuterated methanol, which are much longer than the T1 -relaxation times (18 and 30 s, respectively, at a field B 0 =9.4 T). In protonated solvents the relaxation times become shorter, but the lifetime is still substantially longer than T 1 . In addition, long-lived coherences are shown to have lifetimes as long as 30 s. Thiophene derivatives can be used as molecular tags to study slow transport, slow dynamics and slow chemical processes, as has been shown in recent years.
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Affiliation(s)
- Alexey S. Kiryutin
- International Tomography Center SB RAS; Institutskaya 3 A Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova 2 Novosibirsk 630090 Russia
| | - Mikhail S. Panov
- International Tomography Center SB RAS; Institutskaya 3 A Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova 2 Novosibirsk 630090 Russia
| | - Alexandra V. Yurkovskaya
- International Tomography Center SB RAS; Institutskaya 3 A Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova 2 Novosibirsk 630090 Russia
| | - Konstantin L. Ivanov
- International Tomography Center SB RAS; Institutskaya 3 A Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova 2 Novosibirsk 630090 Russia
| | - Geoffrey Bodenhausen
- Laboratoire des biomolécules; LBM; Département de chimie; École Normale Supérieure; PSL University; Sorbonne Université; CNRS; 24 rue Lhomond 75231 Paris cedex 05 France
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5
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Zhukov IV, Kiryutin AS, Yurkovskaya AV, Grishin YA, Vieth HM, Ivanov KL. Field-cycling NMR experiments in an ultra-wide magnetic field range: relaxation and coherent polarization transfer. Phys Chem Chem Phys 2018; 20:12396-12405. [PMID: 29623979 DOI: 10.1039/c7cp08529j] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An experimental method is described allowing fast field-cycling Nuclear Magnetic Resonance (NMR) experiments over a wide range of magnetic fields from 5 nT to 10 T. The method makes use of a hybrid technique: the high field range is covered by positioning the sample in the inhomogeneous stray field of the NMR spectrometer magnet. For fields below 2 mT a magnetic shield is mounted on top of the spectrometer; inside the shield the magnetic field is controlled by a specially designed coil system. This combination allows us to measure T1-relaxation times and nuclear Overhauser effect parameters over the full range in a routine way. For coupled proton-carbon spin systems relaxation with a common T1 is found at low fields, where the spins are "strongly coupled". In some cases, experiments at ultralow fields provide access to heteronuclear long-lived spin states. Efficient coherent polarization transfer is seen for proton-carbon spin systems at ultralow fields as follows from the observation of quantum oscillations in the polarization evolution. Applications to analysis and the manipulation of heteronuclear spin systems are discussed.
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Affiliation(s)
- Ivan V Zhukov
- International Tomography Center SB RAS, Novosibirsk, 630090, Russia.
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Shchepin RV, Jaigirdar L, Chekmenev EY. Spin-Lattice Relaxation of Hyperpolarized Metronidazole in Signal Amplification by Reversible Exchange in Micro-Tesla Fields. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2018; 122:4984-4996. [PMID: 29955244 PMCID: PMC6017983 DOI: 10.1021/acs.jpcc.8b00283] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Simultaneous reversible chemical exchange of parahydrogen and to-be-hyperpolarized substrate on metal centers enables spontaneous transfer of spin order from parahydrogen singlet to nuclear spins of the substrate. When performed at sub-micro-Tesla magnetic field, this technique of NMR Signal Amplification by Reversible Exchange in SHield Enables Alignment Transfer to Heteronuclei (SABRE-SHEATH). SABRE-SHEATH has been shown to hyperpolarize nitrogen-15 sites of a wide range of biologically interesting molecules to a high polarization level (P > 20%) in one minute. Here, we report on a systematic study of 1H, 13C and 15N spin-lattice relaxation (T1) of metronidazole-13C2-15N2 in SABRE-SHEATH hyperpolarization process. In micro-Tesla range, we find that all 1H, 13C and 15N spins studied share approximately the same T1 values (ca. 4 s at the conditions studied) due to mixing of their Zeeman levels, which is consistent with the model of relayed SABRE-SHEATH effect. These T1 values are significantly lower than those at higher magnetic (i.e. the Earth's magnetic field and above), which exceed 3 minutes in some cases. Moreover, these relatively short T1 values observed below 1 micro-Tesla limit the polarization build-up process of SABRE-SHEATH- thereby, limiting maximum attainable 15N polarization. The relatively short nature of T1 values observed below 1 micro-Tesla is primarily caused by intermolecular interactions with quadrupolar iridium centers or dihydride protons of the employed polarization transfer catalyst, whereas intramolecular spin-spin interactions with 14N quadrupolar centers have significantly smaller contribution. The presented experimental results and their analysis will be beneficial for more rational design of SABRE-SHEATH (i) polarization transfer catalyst, and (ii) hyperpolarized molecular probes in the context of biomedical imaging and other applications.
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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
| | - 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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7
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Pravdivtsev AN, Yurkovskaya AV, Petrov PA, Vieth HM. Coherent evolution of singlet spin states in PHOTO-PHIP and M2S experiments. Phys Chem Chem Phys 2017; 19:25961-25969. [PMID: 28944791 DOI: 10.1039/c7cp04122e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A consistent theoretical description of the spin dynamics underlying photo-PHIP (para-hydrogen induced polarization) experiments is given and validated experimentally: spectra from zero-quantum coherence (ZQC) "in-phase" and "out-of-phase" were obtained and evolution of ZQCs and the population of singlet spin state was tracked and modeled. Data from recent literature [O. Torres et al., J. Am. Chem. Soc., 2014] are reinterpreted. Advantages of using M2S sequences such as APSOC for detecting photo-PHIP are demonstrated. A sequence for 2D ZQ spectroscopy based on APSOC is proposed and the fundamental principles of ZQ spectroscopy are formulated. This investigation opens a new way to obtain information on the sign of J-couplings using ZQ spectroscopy. The proposed method is also useful to track the redistribution of the singlet spin population in various PHIP related experiments, which is essential for efficient polarization transfer to target nuclei.
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Affiliation(s)
- A N Pravdivtsev
- International Tomography Center SB RAS, Institutskaya 3a, Novosibirsk 630090, Russia. and Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia
| | - A V Yurkovskaya
- International Tomography Center SB RAS, Institutskaya 3a, Novosibirsk 630090, Russia. and Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia
| | - P A Petrov
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia and Nikolaev Institute of Inorganic Chemistry SB RAS, Acad. Lavrentiev Ave., 3, Novosibirsk 630090, Russia
| | - H-M Vieth
- International Tomography Center SB RAS, Institutskaya 3a, Novosibirsk 630090, Russia. and Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, Berlin 14195, Germany
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8
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Pravdivtsev AN, Yurkovskaya AV, Petrov PA, Ivanov KL. A Site-Specific Study of the Magnetic Field-Dependent Proton Spin Relaxation of an Iridium N-Heterocyclic Carbene Complex. Z PHYS CHEM 2016. [DOI: 10.1515/zpch-2016-0849] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
We report a study of proton spin relaxation of an Iridium N-heterocyclic carbene complex [Ir(COD)(IMes)Cl] complex (where COD=1,5-cyclooctadiene, Imes=1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene). This compound is a pre-catalyst of the most efficient complex allowing the signal amplification by reversible exchange (SABRE) effect, relevant for enhancing weak signals in nuclear magnetic resonance (NMR). An important feature of the study is a combination of relaxation measurements over a wide field range with high-resolution NMR detection. As a result, we are able to measure nuclear magnetic relaxation dispersion (NMRD) curves in the field range 0.1 mT–16.4 T (corresponding to the frequency range 4 kHz–700 MHz) for individual protons in the complex under study. This attractive possibility enables determination of the motional correlation times, τc
, for the individual protons by analyzing the features in the NMRD curves (increase of the relaxation times) appearing at the magnetic fields where ωτc
≈1 (here ω is the proton Larmor precession frequency at a given field strength). The following correlation times were determined: (1.3±0.1) ns for the protons of imidazol-2-ylidene, (0.96±0.1) ns for the ortho-protons of two phenyl moieties and (0.95±0.2) ns for the protons of methyl groups. Additionally, we report low-field features coming from “strong coupling” of the protons. One should note that such features must not be misinterpreted by associating them with motional features. From the low-field features we obtain consistent estimates for the proton spin-spin interactions. The analysis of motional correlation times is also of importance for interpretation of spin order transfer from parahydrogen to various substrates in transient organometallic complexes (termed the SABRE effect) at high magnetic field.
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Affiliation(s)
- Andrey N. Pravdivtsev
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3A, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
| | - Alexandra V. Yurkovskaya
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3A, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
| | - Pavel A. Petrov
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, Institutskaya 3, Novosibirsk 630090, Russian Federation
| | - Konstantin L. Ivanov
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3A, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
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Kiryutin AS, Pravdivtsev AN, Ivanov KL, Grishin YA, Vieth HM, Yurkovskaya AV. A fast field-cycling device for high-resolution NMR: Design and application to spin relaxation and hyperpolarization experiments. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 263:79-91. [PMID: 26773525 DOI: 10.1016/j.jmr.2015.11.017] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Revised: 11/03/2015] [Accepted: 11/04/2015] [Indexed: 06/05/2023]
Abstract
A device for performing fast magnetic field-cycling NMR experiments is described. A key feature of this setup is that it combines fast switching of the external magnetic field and high-resolution NMR detection. The field-cycling method is based on precise mechanical positioning of the NMR probe with the mounted sample in the inhomogeneous fringe field of the spectrometer magnet. The device enables field variation over several decades (from 100μT up to 7T) within less than 0.3s; progress in NMR probe design provides NMR linewidths of about 10(-3)ppm. The experimental method is very versatile and enables site-specific studies of spin relaxation (NMRD, LLSs) and spin hyperpolarization (DNP, CIDNP, and SABRE) at variable magnetic field and at variable temperature. Experimental examples of such studies are demonstrated; advantages of the experimental method are described and existing challenges in the field are outlined.
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Affiliation(s)
- Alexey S Kiryutin
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3a, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia.
| | - 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
| | - 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
| | - Yuri A Grishin
- Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Science, Institutskaya 3, Novosibirsk 630090, Russia
| | - Hans-Martin Vieth
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3a, Novosibirsk 630090, Russia; Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany.
| | - 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
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Pravdivtsev AN, Yurkovskaya AV, Vieth HM, Ivanov KL. High resolution NMR study of T₁ magnetic relaxation dispersion. IV. Proton relaxation in amino acids and Met-enkephalin pentapeptide. J Chem Phys 2015; 141:155101. [PMID: 25338911 DOI: 10.1063/1.4897336] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Nuclear Magnetic Relaxation Dispersion (NMRD) of protons was studied in the pentapeptide Met-enkephalin and the amino acids, which constitute it. Experiments were run by using high-resolution Nuclear Magnetic Resonance (NMR) in combination with fast field-cycling, thus enabling measuring NMRD curves for all individual protons. As in earlier works, Papers I-III, pronounced effects of intramolecular scalar spin-spin interactions, J-couplings, on spin relaxation were found. Notably, at low fields J-couplings tend to equalize the apparent relaxation rates within networks of coupled protons. In Met-enkephalin, in contrast to the free amino acids, there is a sharp increase in the proton T1-relaxation times at high fields due to the changes in the regime of molecular motion. The experimental data are in good agreement with theory. From modelling the relaxation experiments we were able to determine motional correlation times of different residues in Met-enkephalin with atomic resolution. This allows us to draw conclusions about preferential conformation of the pentapeptide in solution, which is also in agreement with data from two-dimensional NMR experiments (rotating frame Overhauser effect spectroscopy). Altogether, our study demonstrates that high-resolution NMR studies of magnetic field-dependent relaxation allow one to probe molecular mobility in biomolecules with atomic resolution.
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Affiliation(s)
| | | | - Hans-Martin Vieth
- Institut für Experimentalphysik, Freie Universität Berlin Arnimallee 14, 14195 Berlin, Germany
| | - Konstantin L Ivanov
- International Tomography Center, Institutskaya 3a, Novosibirsk 630090, Russia
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Liu BX, Guo Q, Peng GT, He XX, Chen XJ, Lei LF, Deng Y, Jun Su X, Zhang CX. New cyclic tetrapeptide from the coral-derived endophytic bacteria Brevibacterium sp. L-4 collected from the South China Sea. Nat Prod Res 2015. [DOI: 10.1080/14786419.2015.1026340] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Bing-Xin Liu
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Qiong Guo
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Guang-Tian Peng
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Xi-Xin He
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Xiao-Jie Chen
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Ling-Fang Lei
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Yun Deng
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Xian Jun Su
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
| | - Cui-Xian Zhang
- School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
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12
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Pravdivtsev AN, Yurkovskaya AV, Ivanov KL, Vieth HM. Importance of polarization transfer in reaction products for interpreting and analyzing CIDNP at low magnetic fields. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 254:35-47. [PMID: 25797825 DOI: 10.1016/j.jmr.2015.02.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 02/12/2015] [Accepted: 02/16/2015] [Indexed: 05/14/2023]
Abstract
The magnetic field dependence of Chemically Induced Dynamic Nuclear Polarization (CIDNP) was studied for the amino acids N-acetyl histidine, N-acetyl tryptophan and N-acetyl tyrosine. It is demonstrated that at low field CIDNP is strongly affected by polarization redistribution in the diamagnetic molecules. Such a polarization transfer is of coherent nature and is due to spin coherences formed together with non-equilibrium population of the spin states. These coherences clearly manifest themselves in an oscillatory time dependence of polarization. Polarization transfer effects are most pronounced at nuclear spin Level Anti-Crossings (LACs), which also result in sharp features in the CIDNP field dependence. Thus, polarization transfer is an important factor, which has to be taken into account in order to interpret low-field CIDNP data on both qualitative and quantitative level. Possible applications of polarization transfer phenomena are also discussed in the paper. In particular, the role of LACs in spin order transfer is highlighted: LACs provide a new tool for precise manipulation of spin hyperpolarization and NMR enhancement of selected target spins.
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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
| | - 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.
| | - Hans-Martin Vieth
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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13
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Pravdivtsev AN, Yurkovskaya AV, Zimmermann H, Vieth HM, Ivanov KL. Magnetic field dependent long-lived spin states in amino acids and dipeptides. Phys Chem Chem Phys 2014; 16:7584-94. [PMID: 24634918 DOI: 10.1039/c3cp55197k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetic field dependence of long-lived spin states (LLSs) of the β-CH2 protons of aromatic amino acids was studied. LLSs are spin states, which are immune to dipolar relaxation, thus having lifetimes far exceeding the longitudinal relaxation times; the simplest example of an LLS is given by the singlet state of two coupled spins. LLSs were created by means of the photo-chemically induced dynamic nuclear polarization technique. The systems studied were amino acids, histidine and tyrosine, with different isotopomers. For labeled amino acids with the α-CH and aromatic protons substituted by deuterium at low fields the LLS lifetime, TLLS, for the β-CH2 protons was more than 40 times longer than the T1-relaxation time. Upon increasing the number of protons the ratio TLLS/T1 was reduced; however, even in the fully protonated amino acids it was about 10; that is, the long-lived mode was still preserved in the system. In addition, the effect of paramagnetic impurities on spin relaxation was studied; field dependencies of T1 and TLLS were measured. LLSs were also formed in tyrosine-containing dyads; a TLLS/T1 ratio of ∼7 was found, usable for extending the spin polarization lifetime in such systems.
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Affiliation(s)
- Andrey N Pravdivtsev
- International Tomography Center SB RAS, Institutskaya 3a, Novosibirsk, 630090, Russia.
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Ivanov KL, Pravdivtsev AN, Yurkovskaya AV, Vieth HM, Kaptein R. The role of level anti-crossings in nuclear spin hyperpolarization. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 81:1-36. [PMID: 25142733 DOI: 10.1016/j.pnmrs.2014.06.001] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 06/11/2014] [Accepted: 06/13/2014] [Indexed: 05/22/2023]
Abstract
Nuclear spin hyperpolarization is an important resource for increasing the sensitivity of NMR spectroscopy and MRI. Signal enhancements can be as large as 3-4 orders of magnitude. In hyperpolarization experiments, it is often desirable to transfer the initial polarization to other nuclei of choice, either protons or insensitive nuclei such as (13)C and (15)N. This situation arises primarily in Chemically Induced Dynamic Nuclear Polarization (CIDNP), Para-Hydrogen Induced Polarization (PHIP), and the related Signal Amplification By Reversible Exchange (SABRE). Here we review the recent literature on polarization transfer mechanisms, in particular focusing on the role of Level Anti-Crossings (LACs) therein. So-called "spontaneous" polarization transfer may occur both at low and high magnetic fields. In addition, transfer of spin polarization can be accomplished by using especially designed pulse sequences. It is now clear that at low field spontaneous polarization transfer is primarily due to coherent spin-state mixing under strong coupling conditions. However, thus far the important role of LACs in this process has not received much attention. At high magnetic field, polarization may be transferred by cross-relaxation effects. Another promising high-field technique is to generate the strong coupling condition by spin locking using strong radio-frequency fields. Here, an analysis of polarization transfer in terms of LACs in the rotating frame is very useful to predict which spin orders are transferred depending on the strength and frequency of the B1 field. Finally, we will examine the role of strong coupling and LACs in magnetic-field dependent nuclear spin relaxation and the related topic of long-lived spin-states.
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Affiliation(s)
- 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.
| | - 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
- Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, Berlin 14195, Germany
| | - Robert Kaptein
- Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, NL-3584 CH Utrecht, The Netherlands.
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He XX, Chen XJ, Peng GT, Guan SY, Lei LF, Yao JH, Liu BX, Zhang CX. Pelopuradazole, a new imidazole derivative alkaloid from the marine bacteria Pelomonas puraquae sp. nov. Nat Prod Res 2014; 28:680-2. [PMID: 24597911 DOI: 10.1080/14786419.2014.891591] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
One new imidazole derivative alkaloid pelopuradazole (1), together with three known alkaloids as in 3H-imidazole-4-carboxylic acid (2), 1H-pyrrole-2-carboxylic acid (3) and 2-methyl-3H-imidazole-4-carboxylic acid (4) and two known cyclo-dipeptides pelopurin A (5) and pelopurin B (6), has been isolated from the marine bacterium Pelomonas puraquae sp. nov. Pelopuradazole (1) was a new imidazole derivative alkaloid, while compounds 2, 3, 5 and 6 were firstly obtained as natural products. Compounds 1-6 were isolated from P. puraquae sp. nov. for the first time.
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Affiliation(s)
- Xi-Xin He
- a School of Chinese Materia Medica, Guangzhou University of Chinese Medicine , 232 Waihuan East Road, Guangzhou 510006 , P.R. China
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Pravdivtsev AN, Yurkovskaya AV, Vieth HM, Ivanov KL. Coherent transfer of nuclear spin polarization in field-cycling NMR experiments. J Chem Phys 2013; 139:244201. [DOI: 10.1063/1.4848699] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Korchak SE, Ivanov KL, Pravdivtsev AN, Yurkovskaya AV, Kaptein R, Vieth HM. High resolution NMR study of T1magnetic relaxation dispersion. III. Influence of spin 1/2 hetero-nuclei on spin relaxation and polarization transfer among strongly coupled protons. J Chem Phys 2012; 137:094503. [DOI: 10.1063/1.4746780] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Griesinger C, Bennati M, Vieth HM, Luchinat C, Parigi G, Höfer P, Engelke F, Glaser SJ, Denysenkov V, Prisner TF. Dynamic nuclear polarization at high magnetic fields in liquids. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2012; 64:4-28. [PMID: 22578315 DOI: 10.1016/j.pnmrs.2011.10.002] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Accepted: 10/11/2011] [Indexed: 05/03/2023]
Affiliation(s)
- C Griesinger
- MPI for Biophysical Chemistry Göttingen, Am Fassberg 11, 37077 Göttingen, Germany
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