1
|
Ianc O, Teleanu F, Ciumeică A, Lupulescu A, Sadet A, Vasos PR. Improved detection of magnetic interactions in proteins based on long-lived coherences. Commun Chem 2024; 7:112. [PMID: 38755276 PMCID: PMC11099074 DOI: 10.1038/s42004-024-01195-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 04/30/2024] [Indexed: 05/18/2024] Open
Abstract
Living systems rely on molecular building blocks with low structural symmetry. Therefore, constituent amino acids and nucleotides yield short-lived nuclear magnetic responses to electromagnetic radiation. Magnetic signals are at the basis of molecular imaging, structure determination and interaction studies. In solution state, as the molecular weight of analytes increases, coherences with long lifetimes are needed to yield advantageous through-space magnetisation transfers. Interactions between magnetic nuclei can only be detected provided the lifetimes of spin order are sufficient. In J-coupled pairs of nuclei, long-lived coherences (LLC's) connect states with different spin-permutation symmetry. Here in, we show sustained LLC's in protein Lysozyme, weighing 14.3 kDa, with lifetimes twice as long as those of classical magnetisation for the aliphatic protons of glycine residues. We found for the first time that, in a protein of significant molecular weight, LLC's yield substantial through-space magnetisation transfers: spin-order transfer stemming from LLC's overcame transfers from classical coherences by factors > 2. Furthermore, in agreement with theory, the permutation symmetry of LLC-based transfers allows mapping interacting atoms in the protein structure with respect to the molecular plane of glycine residues in a stereospecific manner. These findings can extend the scope of liquid-state high-resolution biomolecular spectroscopy.
Collapse
Affiliation(s)
- Octavian Ianc
- Biophysics and Biomedical Applications Laboratory and Group, LGED, ELI-NP, "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
- Faculty of Physics, University of Bucharest, 405 Atomiștilor Street, 050663, Măgurele, Romania
| | - Florin Teleanu
- Biophysics and Biomedical Applications Laboratory and Group, LGED, ELI-NP, "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
- Interdisciplinary School of Doctoral Studies, University of Bucharest, 36-46 Mihail Kogălniceanu Bd, 050107, Bucharest, Romania
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Andrei Ciumeică
- Interdisciplinary School of Doctoral Studies, University of Bucharest, 36-46 Mihail Kogălniceanu Bd, 050107, Bucharest, Romania
| | - Adonis Lupulescu
- Biophysics and Biomedical Applications Laboratory and Group, LGED, ELI-NP, "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania
| | - Aude Sadet
- Biophysics and Biomedical Applications Laboratory and Group, LGED, ELI-NP, "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania.
- Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, 1090, Vienna, Austria.
| | - Paul R Vasos
- Biophysics and Biomedical Applications Laboratory and Group, LGED, ELI-NP, "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125, Bucharest-Măgurele, Romania.
- Interdisciplinary School of Doctoral Studies, University of Bucharest, 36-46 Mihail Kogălniceanu Bd, 050107, Bucharest, Romania.
- Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, 1090, Vienna, Austria.
| |
Collapse
|
2
|
Sheberstov KF, Sonnefeld A, Bodenhausen G. Collective long-lived zero-quantum coherences in aliphatic chains. J Chem Phys 2024; 160:144308. [PMID: 38602293 DOI: 10.1063/5.0196808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 03/07/2024] [Indexed: 04/12/2024] Open
Abstract
In nuclear magnetic resonance, long-lived coherences constitute a class of zero-quantum (ZQ) coherences that have lifetimes that can be longer than the relaxation lifetimes T2 of transverse magnetization. So far, such coherences have been observed in systems with two coupled spins with spin quantum numbers I = 1/2, where a term S0T0+T0S0 in the density operator corresponds to a coherent superposition between the singlet S0 and the central triplet T0 state. Here, we report on the excitation and detection of collective long-lived coherences in AA'MM'XX' spin systems in molecules containing a chain of at least three methylene (-CH2-) groups. Several variants of excitation by polychromatic spin-lock induced crossing (poly-SLIC) are introduced that can excite a non-uniform distribution of the amplitudes of terms such as S0S0T0S0S0T0, S0T0S0S0T0S0, and T0S0S0T0S0S0. Once the radio frequency fields are switched off, these are not eigenstates, leading to ZQ precession involving all six protons, a process that can be understood as a propagation of spin order along the chain of CH2 groups before the reconversion into observable magnetization by a second poly-SLIC pulse that can be applied to any one or several of the CH2 groups. In the resulting 2D spectra, the ω2 domain shows SQ spectra with the chemical shifts of the CH2 groups irradiated during the reconversion, while the ω1 dimension shows ZQ signals in absorption mode with linewidths on the order of 0.1 Hz that are not affected by the inhomogeneity of the static magnetic field but can be broadened by chemical exchange as occurs in drug screening. The ZQ frequencies are primarily determined by differences ΔJ between vicinal J-couplings.
Collapse
Affiliation(s)
- Kirill F Sheberstov
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Anna Sonnefeld
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Geoffrey Bodenhausen
- Laboratoire des Biomolécules, LBM, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| |
Collapse
|
3
|
Yang X, Liu Y, Fu CX, Chu YH, Chen Q, Wang H, Wei DX, Yao YF. Selectively Probing the Magnetic Resonance Signals of γ-Aminobutyric Acid in Human Brains In Vivo. J Magn Reson Imaging 2024; 59:954-963. [PMID: 37312270 DOI: 10.1002/jmri.28853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/15/2023] Open
Abstract
BACKGROUND Gamma-aminobutyric acid (GABA) is an inhibitory neurotransmitter in human brains, playing a role in the pathogenesis of various psychiatric disorders. Current methods have some non-neglectable shortcomings and noninvasive and accurate detection of GABA in human brains is long-term challenge. PURPOSE To develop a pulse sequence capable of selectively detecting and quantifying the 1 H signal of GABA in human brains based on optimal controlled spin singlet order. STUDY TYPE Prospective. SUBJECTS/PHANTOM A phantom of GABA (pH = 7.3 ± 0.1) and 11 healthy subjects (5 females and 6 males, body mass index: 21 ± 3 kg/m2 , age: 25 ± 4 years). FIELD STRENGTH/SEQUENCE 7 Tesla, 3 Tesla, GABA-targeted magnetic resonance spectroscopy (GABA-MRS-7 T, GABA-MRS-3 T), magnetization prepared two rapid acquisition gradient echoes sequence. ASSESSMENT By using the developed pulse sequences applied on the phantom and healthy subjects, the signals of GABA were successfully selectively probed. Quantification of the signals yields the concentration of GABA in the dorsal anterior cingulate cortex (dACC) in human brains. STATISTICAL TESTS Frequency. RESULTS The 1 H signals of GABA in the phantom and in the human brains of healthy subjects were successfully detected. The concentration of GABA in the dACC of human brains was 3.3 ± 1.5 mM. DATA CONCLUSION The developed pulse sequences can be used to selectively probe the 1 H MR signals of GABA in human brains in vivo. EVIDENCE LEVEL 1 TECHNICAL EFFICACY STAGE: 1.
Collapse
Affiliation(s)
- Xue Yang
- Physics Department and Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200062, China
| | - Ying Liu
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, 200433, China
| | - Cai-Xia Fu
- Application Developments, Siemens Shenzhen Magnetic Resonance Ltd, Shenzhen, 518057, China
| | - Ying-Hua Chu
- MR Collaboration, Siemens Healthineers Ltd, Shanghai, China
| | - Qun Chen
- Physics Department and Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200062, China
| | - He Wang
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, 200433, China
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Da-Xiu Wei
- Physics Department and Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200062, China
| | - Ye-Feng Yao
- Physics Department and Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200062, China
| |
Collapse
|
4
|
Lu J, Jerschow A, Korenchan DE. Selective filtration of NMR signals arising from weakly- and strongly-coupled spin systems. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 354:107529. [PMID: 37572586 DOI: 10.1016/j.jmr.2023.107529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/14/2023]
Abstract
Nuclear magnetic resonance (NMR) spectroscopy is a powerful technique for analyzing chemical and biological systems. However, in complex solutions with similar molecular components, NMR signals can overlap, making it challenging to distinguish and quantify individual species. In this paper, we introduce new spectral editing sequences that exploit the differences in nuclear spin interactions (J-couplings) between weakly- and strongly-coupled two-spin systems. These sequences selectively attenuate or nullify undesired spin magnetization while they preserve the desired signals, resulting in simplified NMR spectra and potentially facilitating single-species imaging applications. We demonstrate the effectiveness of our approach using a 31P spectral filtration method on a model system of nicotinamide dinucleotide (NAD), which exists in oxidized (NAD+) and reduced (NADH) forms. The presented sequences are robust to field inhomogeneity, do not require additional sub-spectra, and retain a significant portion of the original signal.
Collapse
Affiliation(s)
- Jiaqi Lu
- Department of Chemistry, New York University, 100 Washington Square East, Room 710, New York, 10003, NY, USA
| | - Alexej Jerschow
- Department of Chemistry, New York University, 100 Washington Square East, Room 710, New York, 10003, NY, USA
| | - David E Korenchan
- Department of Chemistry, New York University, 100 Washington Square East, Room 710, New York, 10003, NY, USA; Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 75 3rd Ave., Room 1400A, Charlestown, 02129, MA, USA.
| |
Collapse
|
5
|
Lysak DH, Kock FVC, Mamone S, Soong R, Glöggler S, Simpson AJ. In vivo singlet state filtered nuclear magnetic resonance: towards monitoring toxic responses inside living organisms. Chem Sci 2023; 14:1413-1418. [PMID: 36794179 PMCID: PMC9906653 DOI: 10.1039/d2sc06624f] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/06/2023] [Indexed: 01/11/2023] Open
Abstract
In line with recent paradigm shifts in toxicity testing, in vivo nuclear magnetic resonance (NMR) is a powerful tool for studying the biological impacts and perturbations caused by toxicants in living organisms. However, despite the excellent molecular insights that can be obtained through this technique, in vivo NMR applications are hampered by considerable experimental challenges such as poor line shape and spectral overlap. Here, we demonstrate the application of singlet-filtered NMR to target specific metabolites and facilitate the study of metabolite fluxes in living Daphnia magna, an aquatic keystone species and model organism. Informed by mathematical simulations and experiments on ex vivo organisms, singlet state NMR is used to monitor the flux of metabolites such as d-glucose and serine in living D. magna, during the environmentally relevant processes of anoxic stress and reduced food availability. Overall, singlet state NMR is shown to have significant future potential for studying metabolic processes in vivo.
Collapse
Affiliation(s)
- Daniel H. Lysak
- Environmental NMR Centre, University of Toronto Scarborough1265 Military TrailScarboroughOntarioCanada
| | - Flavio V. C. Kock
- Environmental NMR Centre, University of Toronto Scarborough1265 Military TrailScarboroughOntarioCanada,Department of Chemistry, Federal University of São Carlos (UFSCar)Rod. Washington Luís, MonjolinhoSão Carlos–SP13565-905Brazil
| | - Salvatore Mamone
- NMR Signal Enhancement Group, Max Planck Institute for Multidisciplinary Sciences Am Fassberg 11 37077 Göttingen Germany
| | - Ronald Soong
- Environmental NMR Centre, University of Toronto Scarborough1265 Military TrailScarboroughOntarioCanada
| | - Stefan Glöggler
- NMR Signal Enhancement Group, Max Planck Institute for Multidisciplinary Sciences Am Fassberg 11 37077 Göttingen Germany
| | - Andre J. Simpson
- NMR Signal Enhancement Group, Max Planck Institute for Multidisciplinary SciencesAm Fassberg11 37077GöttingenGermany
| |
Collapse
|
6
|
Sonnefeld A, Razanahoera A, Pelupessy P, Bodenhausen G, Sheberstov K. Long-lived states of methylene protons in achiral molecules. SCIENCE ADVANCES 2022; 8:eade2113. [PMID: 36459545 PMCID: PMC10936052 DOI: 10.1126/sciadv.ade2113] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 10/19/2022] [Indexed: 06/17/2023]
Abstract
In nuclear magnetic resonance (NMR), the lifetimes of long-lived states (LLSs) are exquisitely sensitive to their environment. However, the number of molecules where such states can be excited has hitherto been rather limited. Here, it is shown that LLSs can be readily excited in many common molecules that contain two or more neighboring CH2 groups. Accessing such LLSs does not require any isotopic enrichment, nor does it require any stereogenic centers to lift the chemical equivalence of CH2 protons. LLSs were excited in a variety of metabolites, neurotransmitters, vitamins, amino acids, and other molecules. One can excite LLSs in several different molecules simultaneously. In combination with magnetic resonance imaging, LLSs can reveal a contrast upon noncovalent binding of ligands to macromolecules. This suggests new perspectives to achieve high-throughput parallel drug screening by NMR.
Collapse
Affiliation(s)
- Anna Sonnefeld
- Department of chemistry, École Normale Supérieure, PSL University, Paris, France
| | - Aiky Razanahoera
- Department of chemistry, École Normale Supérieure, PSL University, Paris, France
| | - Philippe Pelupessy
- Department of chemistry, École Normale Supérieure, PSL University, Paris, France
| | | | - Kirill Sheberstov
- Department of chemistry, École Normale Supérieure, PSL University, Paris, France
| |
Collapse
|
7
|
Sonnefeld A, Bodenhausen G, Sheberstov K. Polychromatic Excitation of Delocalized Long-Lived Proton Spin States in Aliphatic Chains. PHYSICAL REVIEW LETTERS 2022; 129:183203. [PMID: 36374699 DOI: 10.1103/physrevlett.129.183203] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 07/07/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
Long-lived states (LLS) involving pairs of magnetically inequivalent but chemically equivalent proton spins in aliphatic (CH_{2})_{n} chains can be excited by simultaneous application of weak selective radio frequency fields at n chemical shifts by polychromatic spin-lock induced crossing. The LLS are delocalized throughout the aliphatic chains by mixing of intrapair singlet states and by excitation of LLS comprising products of four and six spin operators. The measured lifetimes T_{LLS} in a model compound are about 5 times longer than T_{1} and are strongly affected by interactions with macromolecules.
Collapse
Affiliation(s)
- Anna Sonnefeld
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Geoffrey Bodenhausen
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Kirill Sheberstov
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| |
Collapse
|
8
|
Ivanov KL, Snadin AV, Kiryutin AS, Lukzen NN. Analytical solution for the inverting pulses with constant adiabaticity. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2022; 343:107298. [PMID: 36116162 DOI: 10.1016/j.jmr.2022.107298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/01/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
The exact solution was found for inverting pulses with constant adiabaticity for spin ½. The analytical relationship between the time-varying frequency of the microwave resonant field (or RF field in the case of NMR) and its amplitude time dependence such that the adiabaticity parameter remains constant for the single isochromat throughout the pulse is found. Comparison with EPR (hyperbolic tangent)-(hyperbolic secant) pulse method was carried out. On the basis of the analytical solution the pulses with different dependences of the microwave field amplitude conserving the constant adiabaticity have been constructed. The pulses exhibit rather sharp inversion selectivity that can be used in the field of EPR, NMR and MRI.
Collapse
Affiliation(s)
- Konstantin L Ivanov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexander V Snadin
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexei S Kiryutin
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Nikita N Lukzen
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
| |
Collapse
|
9
|
Korenchan DE, Lu J, Sabba M, Dagys L, Brown LJ, Levitt MH, Jerschow A. 31P spin-lattice and singlet order relaxation mechanisms in pyrophosphate studied by isotopic substitution, field shuttling NMR, and molecular dynamics simulation. Phys Chem Chem Phys 2022; 24:24238-24245. [PMID: 36168981 DOI: 10.1039/d2cp03801c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nuclear spin relaxation mechanisms are often difficult to isolate and identify, especially in molecules with internal flexibility. Here we combine experimental work with computation in order to determine the major mechanisms responsible for 31P spin-lattice and singlet order (SO) relaxation in pyrophosphate, a physiologically relevant molecule. Using field-shuttling relaxation measurements (from 2 μT to 9.4 T) and rates calculated from molecular dynamics (MD) trajectories, we identified chemical shift anisotropy (CSA) and spin-rotation as the major mechanisms, with minor contributions from intra- and intermolecular coupling. The significant spin-rotation interaction is a consequence of the relatively rapid rotation of the -PO32- entities around the bridging P-O bonds, and is treated by a combination of MD simulations and quantum chemistry calculations. Spin-lattice relaxation was predicted well without adjustable parameters, and for SO relaxation one parameter was extracted from the comparison between experiment and computation (a correlation coefficient between the rotational motion of the groups).
Collapse
Affiliation(s)
- David E Korenchan
- Department of Chemistry, New York University, 100 Washington Square E, New York, NY 10003, USA.
| | - Jiaqi Lu
- Department of Chemistry, New York University, 100 Washington Square E, New York, NY 10003, USA.
| | - Mohamed Sabba
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
| | - Laurynas Dagys
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
| | - Lynda J Brown
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
| | - Malcolm H Levitt
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
| | - Alexej Jerschow
- Department of Chemistry, New York University, 100 Washington Square E, New York, NY 10003, USA.
| |
Collapse
|
10
|
Abstract
Nuclear magnetization storage, once limited by longitudinal and transverse relaxation lifetimes, T1 and T2, can be prolonged by symmetry-adapted nuclear spin order, i.e. long-lived states (LLS) and long-lived coherences (LLC), which have significantly extended relaxation time constants compared to T1 and T2, respectively. Excitation and/or detection of LLS currently involves pulses covering wide frequency ranges in high-magnetic-field spectrometers. This leads to excitation of unwanted signals that may overlap and interfere with the resonances of interest. Herein, we present a new pulse sequence that converts longitudinal magnetization to LLS and further to detectable magnetization using only frequency-selective pulses. We demonstrate the suitability of this sequence for different J-coupled spin pairs in dipeptide AlaGly and protein Ubiquitin. The newly developed method is adapted for investigations of LLS in complex systems such as proteins and mixtures of metabolites where selected molecular groups are to be investigated separately.
Collapse
Affiliation(s)
- Florin Teleanu
- Extreme Light Infrastructure-Nuclear Physics ELI-NP, Laser Gamma Experiments Department (LGED), "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125 Bucharest-Măgurele, Romania
- Interdisciplinary School of Doctoral Studies, University of Bucharest, Regina Elisabeta Boulevard, 050663 Bucharest, Romania
| | - Adonis Lupulescu
- Extreme Light Infrastructure-Nuclear Physics ELI-NP, Laser Gamma Experiments Department (LGED), "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125 Bucharest-Măgurele, Romania
| | - Paul R Vasos
- Extreme Light Infrastructure-Nuclear Physics ELI-NP, Laser Gamma Experiments Department (LGED), "Horia Hulubei" National Institute for Physics and Nuclear Engineering IFIN-HH, 30 Reactorului Street, 077125 Bucharest-Măgurele, Romania
- Interdisciplinary School of Doctoral Studies, University of Bucharest, Regina Elisabeta Boulevard, 050663 Bucharest, Romania
| |
Collapse
|
11
|
Yang X, Hu KR, Xin JX, Li YX, Yang G, Wei DX, Yao YF. Multiple-targeting NMR signal selection by optimal control of nuclear spin singlet. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2022; 338:107188. [PMID: 35338893 DOI: 10.1016/j.jmr.2022.107188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 02/24/2022] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
Selectively probing specific molecules in complex mixtures with nuclear magnetic resonance promises new insights into molecular structures or molecular interaction. Such a study often can be further facilitated when two or more objects in chemical moieties of interest can be precisely targeted. Herein, we proposed a novel method to implement the multiple-targeting signal selection by optimal control of the spin singlets of two or more targeted spin systems from one or more molecules. This method can endow the conventional nuclear magnetic resonance (NMR), magnetic resonance image (MRI) and magnetic resonance spectrum (MRS) with the multiple-targeting signal selectivity to selectively probe several targeted molecules and/or chemical groups simultaneously.
Collapse
Affiliation(s)
- Xue Yang
- Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
| | - Kai-Rui Hu
- Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
| | - Jia-Xiang Xin
- Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
| | - Yu-Xiao Li
- Department of Radiology, Shanghai Changhai Hospital, The Second Military Medical University, Shanghai 200433, China
| | - Guang Yang
- Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
| | - Da-Xiu Wei
- Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.
| | - Ye-Feng Yao
- Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.
| |
Collapse
|
12
|
Huang C, Peng Y, Lin E, Ni Z, Lin X, Zhan H, Huang Y, Chen Z. Adaptable Singlet-Filtered Nuclear Magnetic Resonance Spectroscopy for Chemical and Biological Applications. Anal Chem 2022; 94:4201-4208. [PMID: 35238535 DOI: 10.1021/acs.analchem.1c04210] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Proton nuclear magnetic resonance (1H NMR) spectroscopy presents a powerful detection tool for studying chemical compositions and molecular structures. In practical chemical and biological applications, 1H NMR experiments are generally confronted with the challenge of spectral congestions caused by abundant observable components and intrinsic limitations of a narrow frequency distribution range and extensive J coupling splitting. Herein, a one-dimensional (1D) general NMR method is proposed to individually extract the signals of targeted proton groups based on their endogenous spin singlet states excited from J coupling interactions, and it is suitable for high-resolution detections on complex chemical and biological samples. The applicability of the proposed method is demonstrated by experimental observations on chemical solutions containing different coupled components, intact grape tissues subjected to crowded resonances, and in vitro pig brain with various metabolites. Moreover, the proposed method is further exploited for magnetic resonance spectroscopy applications by directly combining the spatial localization module, showing promise in in vivo biological metabolite studies.
Collapse
Affiliation(s)
- Chengda Huang
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Yang Peng
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Enping Lin
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Zhikai Ni
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Xiaoqing Lin
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Haolin Zhan
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Yuqing Huang
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| | - Zhong Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Siming South Road 422, Xiamen 361005, China
| |
Collapse
|
13
|
Glöggler S, Yang S, Saul P, Mamone S, Kaltschnee L. Bimodal fluorescence/magnetic resonance molecular probes with extended spin lifetimes. Chemistry 2021; 28:e202104158. [PMID: 34854145 PMCID: PMC9302690 DOI: 10.1002/chem.202104158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Indexed: 11/12/2022]
Abstract
Bimodal molecular probes combining nuclear magnetic resonance (NMR) and fluorescence have been widely studied in basic science, as well as clinical research. The investigation of spin phenomena holds promise to broaden the scope of available probes allowing deeper insights into physiological processes. Herein, a class of molecules with a bimodal character with respect to fluorescence and nuclear spin singlet states is introduced. Singlet states are NMR silent but can be probed indirectly. Symmetric, perdeuterated molecules, in which the singlet states can be populated by vanishingly small electron‐mediated couplings (below 1 Hz) are reported. The lifetimes of these states are an order of magnitude longer than the longitudinal relaxation times and up to four minutes at 7 T. Moreover, these molecules show either aggregation induced emission (AIE) or aggregation caused quenching (ACQ) with respect to their fluorescence. In the latter case, the existence of excited dimers, which are proposed to use in a switchable manner in combination with the quenching of nuclear spin singlet states, is observed
Collapse
Affiliation(s)
- Stefan Glöggler
- Max-Planck-Institute for Biophysical Chemistry, NMR Signal Enhancement Group, Am Fassberg 11, 37077, Göttingen, GERMANY
| | - Shengjun Yang
- Max-Planck-Institute for Biophysical Chemistry: Max-Planck-Institut fur biophysikalische Chemie, NMR Signal Enhancement, GERMANY
| | - Philip Saul
- Max-Planck-Institute for Biophysical Chemistry: Max-Planck-Institut fur biophysikalische Chemie, NMR Singal Enhancement, GERMANY
| | - Salvatore Mamone
- Max-Planck-Institute for Biophysical Chemistry: Max-Planck-Institut fur biophysikalische Chemie, NMR Signal Enhancement, GERMANY
| | - Lukas Kaltschnee
- Max-Planck-Institute for Biophysical Chemistry: Max-Planck-Institut fur biophysikalische Chemie, NMR Signal Enhancement, GERMANY
| |
Collapse
|
14
|
Saul P, Yang S, Mamone S, Opazo F, Meyer A, Rizzoli SO, Glöggler S. Exotic nuclear spin behavior in dendritic macromolecules. Phys Chem Chem Phys 2021; 23:26349-26355. [PMID: 34792046 DOI: 10.1039/d1cp04483d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dendrimers are a class of branched, highly symmetric macromolecules that have been shown to be useful for a vast number of different applications. Potential uses as fluorescence sensors, in catalysis and perhaps most importantly in medical applications as drug delivery systems or cytotoxica have been proposed. Herein we report on an exotic behaviour of the nuclear spins in a dendritic macromolecule in the presence of different paramagnetic ions. We show that the stability of the long lived nuclear singlet state, is affected by the presence of Cu(II), whereas other ions did not have any influence at all. This effect could not be observed in the case of a simple tripeptide, in which the nuclear singlet stability was influenced by all investigated paramagnetic ions, a potentially useful effect in the development of Cu(II) selective probes. By adding a fluorescent marker to our molecule we could show that the nuclear singlet multimer (NUSIMER) is taken up by living cells. Furthermore we were able to show that nuclear singlet state NMR can be used to investigate the NUSIMER in the presence of living cells, showing that an application in in vivo NMR can be feasible.
Collapse
Affiliation(s)
- Philip Saul
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. .,Center for Biostructural Imaging of Neurodegeneration, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
| | - Shengjun Yang
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. .,Center for Biostructural Imaging of Neurodegeneration, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
| | - Salvatore Mamone
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. .,Center for Biostructural Imaging of Neurodegeneration, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
| | - Felipe Opazo
- Center for Biostructural Imaging of Neurodegeneration, Von-Siebold-Straße 3A, 37075 Göttingen, Germany.,Institute for Neuro- and Sensory Physiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Andreas Meyer
- Research Group Electron Paramagnetic Resonance, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Silvio O Rizzoli
- Institute for Neuro- and Sensory Physiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Stefan Glöggler
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. .,Center for Biostructural Imaging of Neurodegeneration, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
| |
Collapse
|
15
|
Korenchan DE, Lu J, Levitt MH, Jerschow A. 31P nuclear spin singlet lifetimes in a system with switchable magnetic inequivalence: experiment and simulation. Phys Chem Chem Phys 2021; 23:19465-19471. [PMID: 34525141 DOI: 10.1039/d1cp03085j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
31P NMR spectroscopy and the study of nuclear spin singlet relaxation phenomena are of interest in particular due to the importance of phosphorus-containing compounds in physiology. We report the generation and measurement of relaxation of 31P singlet order in a chemically equivalent but magnetically inequivalent case. Nuclear magnetic resonance singlet state lifetimes of 31P pairs have heretofore not been reported. Couplings between 1H and 31P nuclei lead to magnetic inequivalence and serve as a mechanism of singlet state population conversion within this molecule. We show that in this molecule singlet relaxation occurs at a rate significantly faster than spin-lattice relaxation, and that anticorrelated chemical shift anisotropy can account for this observation. Calculations of this mechanism, with the help of molecular dynamics simulations and ab initio calculations, provide excellent agreement with the experimental findings. This study could provide guidance for the study of 31P singlets within other compounds, including biomolecules.
Collapse
Affiliation(s)
| | - Jiaqi Lu
- Department of Chemistry, New York University, New York, NY, USA.
| | | | - Alexej Jerschow
- Department of Chemistry, New York University, New York, NY, USA.
| |
Collapse
|
16
|
Melchiorre G, Nelder C, Brown LJ, Dumez JN, Pileio G. Single-scan measurements of nuclear spin singlet order decay rates. Phys Chem Chem Phys 2021; 23:9851-9859. [PMID: 33908503 DOI: 10.1039/d1cp00807b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Measurements of singlet spin order decay rates are time consuming due to the long-lived nature of this form of order and the typical pseudo-2D mode of acquisition. Additionally, this acquisition modality is not ideal for experiments run on hyperpolarized order because of the single-shot nature of hyperpolarization techniques. We present a methodology based on spatial encoding that not only significantly reduces the duration of these experiments but also confers compatibility using spin hyperpolarization techniques. The method condenses in a single shot the variable delay array used to measure decay rates in conventional pseudo-2D relaxation experiments. This results in a substantial time saving factor and, more importantly, makes the experiment compatible with hyperpolarization techniques since only a single hyperpolarized sample is required. Furthermore, the presented method, besides offering savings on time and costs, avoids reproducibility concerns associated with repetition in the hyperpolarization procedure. The method accelerates the measurement and characterization of singlet order decay times, and, when coupled with hyperpolarization techniques, can facilitate the quest for systems with very long decay times.
Collapse
Affiliation(s)
- Giulia Melchiorre
- School of Chemistry, University of Southampton, SO17 1BJ, Southampton, UK.
| | | | | | | | | |
Collapse
|
17
|
Mamone S, Schmidt AB, Schwaderlapp N, Lange T, von Elverfeldt D, Hennig J, Glöggler S. Localized singlet-filtered MRS in vivo. NMR IN BIOMEDICINE 2021; 34:e4400. [PMID: 32869915 DOI: 10.1002/nbm.4400] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/05/2020] [Accepted: 08/08/2020] [Indexed: 06/11/2023]
Abstract
MR is a prominent technology to investigate diseases, with millions of clinical procedures performed every year. Metabolic dysfunction is one common aspect associated with many diseases. Thus, understanding and monitoring metabolic changes is essential to develop cures for many illnesses, including for example cancer and neurodegeneration. MR methodologies are especially suited to study endogenous metabolites and processes within an organism in vivo, which has led to many insights about physiological functions. Advancing metabolic MR techniques is therefore key to further understand physiological processes. Here, we introduce an approach based on nuclear spin singlet states to specifically filter metabolic signals and particularly show that singlet-filtered glutamate can be observed distinctly in the hippocampus of a living mouse in vivo. This development opens opportunities to make use of the singlet spin phenomenon in vivo and besides its use as a filter to provide scope for new contrast agents.
Collapse
Affiliation(s)
- Salvatore Mamone
- NMR Signal Enhancement Group, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG, Göttingen, Germany
| | - Andreas B Schmidt
- Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- German Consortium for Cancer Research (DKTK), partner site Freiburg, Freiburg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Niels Schwaderlapp
- Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Thomas Lange
- Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Dominik von Elverfeldt
- Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Jürgen Hennig
- Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Stefan Glöggler
- NMR Signal Enhancement Group, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG, Göttingen, Germany
| |
Collapse
|
18
|
Pravdivtsev AN, Sönnichsen FD, Hövener JB. In vitro singlet state and zero-quantum encoded magnetic resonance spectroscopy: Illustration with N-acetyl-aspartate. PLoS One 2020; 15:e0239982. [PMID: 33002045 PMCID: PMC7529218 DOI: 10.1371/journal.pone.0239982] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 09/16/2020] [Indexed: 12/20/2022] Open
Abstract
Magnetic resonance spectroscopy (MRS) allows the analysis of biochemical processes non-invasively and in vivo. Still, its application in clinical diagnostics is rare. Routine MRS is limited to spatial, chemical and temporal resolutions of cubic centimetres, mM and minutes. In fact, the signal of many metabolites is strong enough for detection, but the resonances significantly overlap, exacerbating identification and quantification. Besides, the signals of water and lipids are much stronger and dominate the entire spectrum. To suppress the background and isolate selected signals, usually, relaxation times, J-coupling and chemical shifts are used. Here, we propose methods to isolate the signals of selected molecular groups within endogenous metabolites by using long-lived spin states (LLS). We exemplify the method by preparing the LLSs of coupled protons in the endogenous molecules N-acetyl-L-aspartic acid (NAA). First, we store polarization in long-lived, double spin states, followed by saturation pulses before the spin order is converted back to observable magnetization or double quantum filters to suppress background signals. We show that LLS and zero-quantum coherences can be used to selectively prepare and measure the signals of chosen metabolites or drugs in the presence of water, inhomogeneous field and highly concentrated fatty solutions. The strong suppression of unwanted signals achieved allowed us to measure pH as a function of chemical shift difference.
Collapse
Affiliation(s)
- Andrey N Pravdivtsev
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Kiel, Germany
| | - Frank D Sönnichsen
- Otto Diels Institute for Organic Chemistry, Kiel University, Kiel, Germany
| | - Jan-Bernd Hövener
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Kiel, Germany
| |
Collapse
|
19
|
Mamone S, Rezaei-Ghaleh N, Opazo F, Griesinger C, Glöggler S. Singlet-filtered NMR spectroscopy. SCIENCE ADVANCES 2020; 6:eaaz1955. [PMID: 32128422 PMCID: PMC7034991 DOI: 10.1126/sciadv.aaz1955] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
Selectively studying parts of proteins and metabolites in tissue with nuclear magnetic resonance promises new insights into molecular structures or diagnostic approaches. Nuclear spin singlet states allow the selection of signals from chemical moieties of interest in proteins or metabolites while suppressing background signal. This selection process is based on the electron-mediated coupling between two nuclear spins and their difference in resonance frequency. We introduce a generalized and versatile pulsed NMR experiment that allows populating singlet states on a broad scale of coupling patterns. This approach allowed us to filter signals from proton pairs in the Alzheimer's disease-related b-amyloid 40 peptide and in metabolites in brain matter. In particular, for glutamine/glutamate, we have discovered a long-lived state in tissue without the typically required singlet sustaining by radiofrequency irradiation. We believe that these findings will open up new opportunities to study metabolites with a view on future in vivo applications.
Collapse
Affiliation(s)
- Salvatore Mamone
- NMR Signal Enhancement Group, Max Planck Institute for Biophysical Chemistry, AmFaßberg 11, 37077 Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
| | - Nasrollah Rezaei-Ghaleh
- Department of Neurology, University Medical Center Göttingen, Waldweg 33, 37073 Göttingen, Germany
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
| | - Felipe Opazo
- Center for Biostructural Imaging of Neurodegeneration of UMG, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
- Institute for Neuro- and Sensory Physiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Christian Griesinger
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
| | - Stefan Glöggler
- NMR Signal Enhancement Group, Max Planck Institute for Biophysical Chemistry, AmFaßberg 11, 37077 Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG, Von-Siebold-Straße 3A, 37075 Göttingen, Germany
| |
Collapse
|
20
|
Generating and sustaining long-lived spin states in 15N, 15N'-azobenzene. Sci Rep 2019; 9:20161. [PMID: 31882901 PMCID: PMC6934830 DOI: 10.1038/s41598-019-56734-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 12/11/2019] [Indexed: 11/23/2022] Open
Abstract
Long-Lived spin States (LLSs) hold a great promise for sustaining non-thermal spin order and investigating various slow processes by Nuclear Magnetic Resonance (NMR) spectroscopy. Of special interest for such application are molecules containing nearly equivalent magnetic nuclei, which possess LLSs even at high magnetic fields. In this work, we report an LLS in trans-15N,15N′-azobenzene. The singlet state of the 15N spin pair exhibits a long-lived character. We solve the challenging problem of generating and detecting this LLS and further increase the LLS population by converting the much higher magnetization of protons into the 15N singlet spin order. As far as the longevity of this spin order is concerned, various schemes have been tested for sustaining the LLS. Lifetimes of 17 minutes have been achieved at 16.4 T, a value about 250 times longer than the longitudinal relaxation time of 15N in this magnetic field. We believe that such extended relaxation times, along with the photochromic properties of azobenzene, which changes conformation upon light irradiation and can be hyperpolarized by using parahydrogen, are promising for designing new experiments with photo-switchable long-lived hyperpolarization.
Collapse
|
21
|
Ivanov KL, Lukzen NN. Multiplet-to-net CIDEP conversion by MW-pulses with adiabatically ramped amplitude. Mol Phys 2019. [DOI: 10.1080/00268976.2018.1562121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Konstantin L. Ivanov
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk, Russia
- Novosibirsk State University, Novosibirsk, Russia
| | - Nikita N. Lukzen
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk, Russia
- Novosibirsk State University, Novosibirsk, Russia
| |
Collapse
|
22
|
|
23
|
Ariyasingha NM, Salnikov OG, Kovtunov KV, Kovtunova LM, Bukhtiyarov VI, Goodson BM, Rosen MS, Koptyug IV, Gelovani JG, Chekmenev EY. Relaxation Dynamics of Nuclear Long-Lived Spin States in Propane and Propane-d 6 Hyperpolarized by Parahydrogen. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2019; 123:11734-11744. [PMID: 31798763 PMCID: PMC6890414 DOI: 10.1021/acs.jpcc.9b01538] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We report a systematic study of relaxation dynamics of hyperpolarized (HP) propane and HP propane-d6 prepared by heterogeneous pairwise parahydrogen addition to propylene and propylene-d6 respectively. Long-lived spin states (LLS) created for these molecules at the low magnetic field of 0.0475 T were employed for this study. The parahydrogen-induced overpopulation of a HP propane LLS decays exponentially with time constant (TLLS) approximately 3-fold greater than the corresponding T1 values. Both TLLS and T1 increase linearly with propane pressure in the range from 1 atm (the most biomedically relevant conditions for pulmonary MRI) to 5 atm. The TLLS value of HP propane gas at 1 atm is ~3 s. Deuteration of the substrate (propylene-d6) yields hyperpolarized propane-d6 gas with TLLS values approximately 20% shorter than those of hyperpolarized fully protonated propane gas, indicating that deuteration does not benefit the lifetime of the LLS HP state. The use of pH2 or Xe/N2 buffering gas during heterogeneous hydrogenation reaction (leading to production of 100% HP propane (no buffering gas) versus 43% HP propane gas (with 57% buffering gas) composition mixtures) results in (i) no significant changes in T1, (ii) decrease of TLLS values (by 35±7% and 8±7% respectively); and (iii) an increase of the polarization levels of HP propane gas with a propane concentration decrease (by 1.6±0.1-fold and 1.4±0.1-fold respectively despite the decrease in TLLS, which leads to disproportionately greater polarization losses during HP gas transport). Moreover, we demonstrate the feasibility of HP propane cryo-collection (which can be potentially useful for preparing larger amounts of concentrated HP propane, when buffering gas is employed), and TLLS of liquefied HP propane reaches 14.7 seconds, which is greater than the TLLS value of HP propane gas at any pressure studied. Finally, we have explored the utility of using a partial Spin-Lock Induced Crossing (SLIC) radio frequency (RF) pulse sequence for converting the overpopulated LLS into observable 1H nuclear magnetization at low magnetic field. We find that (i) the bulk of the overpopulated LLS is retained even when the optimal or near-optimal values of SLIC pulse duration are employed, and (ii) the overpopulated LLS of propane is also relatively immune to strong RF pulses-thereby, indicating that LLS is highly suitable as a spin-polarization reservoir in the context of NMR/MRI detection applications. The presented findings may be useful for improving the levels of polarization of HP propane produced by HET-PHIP via the use of an inert buffer gas; increasing the lifetime of the HP state during preparation and storage; and developing efficient approaches for ultrafast MR imaging of HP propane in the context of biomedical applications of HP propane gas, including its potential use as an inhalable contrast agent.
Collapse
Affiliation(s)
- Nuwandi M. Ariyasingha
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan, 48202, United States
| | - Oleg G. Salnikov
- 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
| | - Larisa M. Kovtunova
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
- Boreskov Institute of Catalysis SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk, 630090, Russia
| | - Valerii I. Bukhtiyarov
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
- Boreskov Institute of Catalysis SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk, 630090, Russia
| | - Boyd M. Goodson
- Department of Chemistry and Biochemistry and Materials Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Matthew S. Rosen
- Massachusetts General Hospital/Athinoula A. Martinos Center for Biomedical Imaging, Boston, Massachusetts 02129, United States
| | - Igor V. Koptyug
- International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, 630090, Russia
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
| | - Juri G. Gelovani
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan, 48202, 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
- Corresponding Author
| |
Collapse
|
24
|
Elliott SJ, Stevanato G. Homonuclear ADAPT: A general preparation route to long-lived nuclear singlet order. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 301:49-55. [PMID: 30851665 DOI: 10.1016/j.jmr.2019.02.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 01/27/2019] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
We introduce a simple strategy to access and readout nuclear singlet order based on the alternate repetition of hard pulses and delays. We demonstrate the general applicability of the method by accessing nuclear singlet order in spin systems characterized by diverse coupling regimes. We show that the method is highly efficient in the strong-coupling and chemical equivalence regimes, and can overcome some limitations of other well-established and more elaborated pulse sequences. A simulation package is provided which allows the determination of pulse sequence parameters.
Collapse
Affiliation(s)
- Stuart J Elliott
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Gabriele Stevanato
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Batochime, CH-1015 Lausanne, Switzerland.
| |
Collapse
|
25
|
Yang S, McCormick J, Mamone S, Bouchard L, Glöggler S. Nuclear Spin Singlet States in Photoactive Molecules: From Fluorescence/NMR Bimodality to a Bimolecular Switch for Spin Singlet States. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shengjun Yang
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration Von-Siebold-Str. 3A 37075 Göttingen Germany
| | - Jeffrey McCormick
- Department of Chemistry and Biochemistry University of California at Los Angeles Los Angeles CA 90095-1569 USA
| | - Salvatore Mamone
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration Von-Siebold-Str. 3A 37075 Göttingen Germany
| | - Louis‐S. Bouchard
- Department of Chemistry and Biochemistry University of California at Los Angeles Los Angeles CA 90095-1569 USA
| | - Stefan Glöggler
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration Von-Siebold-Str. 3A 37075 Göttingen Germany
| |
Collapse
|
26
|
Yang S, McCormick J, Mamone S, Bouchard L, Glöggler S. Nuclear Spin Singlet States in Photoactive Molecules: From Fluorescence/NMR Bimodality to a Bimolecular Switch for Spin Singlet States. Angew Chem Int Ed Engl 2019; 58:2879-2883. [DOI: 10.1002/anie.201814198] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 12/27/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Shengjun Yang
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration Von-Siebold-Str. 3A 37075 Göttingen Germany
| | - Jeffrey McCormick
- Department of Chemistry and Biochemistry University of California at Los Angeles Los Angeles CA 90095-1569 USA
| | - Salvatore Mamone
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration Von-Siebold-Str. 3A 37075 Göttingen Germany
| | - Louis‐S. Bouchard
- Department of Chemistry and Biochemistry University of California at Los Angeles Los Angeles CA 90095-1569 USA
| | - Stefan Glöggler
- Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration Von-Siebold-Str. 3A 37075 Göttingen Germany
| |
Collapse
|
27
|
Kiryutin AS, Sauer G, Tietze D, Brodrecht M, Knecht S, Yurkovskaya AV, Ivanov KL, Avrutina O, Kolmar H, Buntkowsky G. Ultrafast Single‐Scan 2D NMR Spectroscopic Detection of a PHIP‐Hyperpolarized Protease Inhibitor. Chemistry 2019; 25:4025-4030. [DOI: 10.1002/chem.201900079] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Indexed: 01/19/2023]
Affiliation(s)
- Alexey S. Kiryutin
- International Tomography Center Institutskaya 3A Novosibirsk Russia
- Novosibirsk State University Pirogova 2 Novosibirsk 630090 Russia
| | - Grit Sauer
- Eduard-Zintl-Institut für Anorganische und Physikalische ChemieTechnische Universität Darmstadt Alarich-Weiss-Straße 8 64287 Darmstadt Germany
| | - Daniel Tietze
- Eduard-Zintl-Institut für Anorganische und Physikalische ChemieTechnische Universität Darmstadt Alarich-Weiss-Straße 8 64287 Darmstadt Germany
| | - Martin Brodrecht
- Eduard-Zintl-Institut für Anorganische und Physikalische ChemieTechnische Universität Darmstadt Alarich-Weiss-Straße 8 64287 Darmstadt Germany
| | - Stephan Knecht
- Eduard-Zintl-Institut für Anorganische und Physikalische ChemieTechnische Universität Darmstadt Alarich-Weiss-Straße 8 64287 Darmstadt Germany
| | - Alexandra V. Yurkovskaya
- International Tomography Center Institutskaya 3A Novosibirsk Russia
- Novosibirsk State University Pirogova 2 Novosibirsk 630090 Russia
| | - Konstantin L. Ivanov
- International Tomography Center Institutskaya 3A Novosibirsk Russia
- Novosibirsk State University Pirogova 2 Novosibirsk 630090 Russia
| | - Olga Avrutina
- Clemens-Schöpf-Institut für Organische Chemie und BiochemieTechnische Universität Darmstadt Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Harald Kolmar
- Clemens-Schöpf-Institut für Organische Chemie und BiochemieTechnische Universität Darmstadt Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Gerd Buntkowsky
- Eduard-Zintl-Institut für Anorganische und Physikalische ChemieTechnische Universität Darmstadt Alarich-Weiss-Straße 8 64287 Darmstadt Germany
| |
Collapse
|
28
|
Rodin BA, Sheberstov KF, Kiryutin AS, Hill-Cousins JT, Brown LJ, Brown RCD, Jamain B, Zimmermann H, Sagdeev RZ, Yurkovskaya AV, Ivanov KL. Constant-adiabaticity radiofrequency pulses for generating long-lived singlet spin states in NMR. J Chem Phys 2019; 150:064201. [DOI: 10.1063/1.5079436] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Bogdan A. Rodin
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Kirill F. Sheberstov
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia
- State Scientific Center of the Russian Federation “State Research Institute for Chemistry and Technology of Organoelement Compounds” (SSC RF GNIIChTEOS), Moscow 111123, Russia
| | - Alexey S. Kiryutin
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | | | - Lynda J. Brown
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Richard C. D. Brown
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Baptiste Jamain
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
- INSA Toulouse, Département de Physique, Université de Toulouse, 31077 Toulouse Cedex 4, France
| | - Herbert Zimmermann
- Department of Biomolecular Mechanisms, Max-Planck-Institut für Medizinische Forschung, Heidelberg 69028, Germany
| | - Renad Z. Sagdeev
- International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Science, Moscow 119991, 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
| |
Collapse
|
29
|
Saul P, Mamone S, Glöggler S. Nuclear singlet multimers (NUSIMERs) with long-lived singlet states. Chem Sci 2019; 10:413-417. [PMID: 30746089 PMCID: PMC6334717 DOI: 10.1039/c8sc02831a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 10/24/2018] [Indexed: 01/13/2023] Open
Abstract
Magnetic resonance (NMR) is a powerful tool in chemical analysis, structure determination and in medical diagnostics. Developing novel biological sensors for this field holds promise to better investigate protein structures or target diseases more efficiently. Herein, we explore nuclear spin singlet states in dendritic macromolecules as a platform molecule to develop stimuli responsive probes. We have developed a nuclear singlet multimer (NUSIMER) based on a generation 5 poly(amidoamine) dendrimer (PAMAM) which contains on average about 90 accessible nuclear spin singlet states with lifetimes up to 10-fold longer than the T 1 relaxation times (up to 10 seconds T s vs. T 1 < 0.5 seconds) in a single molecule. We demonstrate little influence on the singlet lifetime in phosphate buffer (H2O) and a high viscosity gel environment in the presence of paramagnetic oxygen. Additionally, we demonstrate an increase in singlet lifetime upon the release of a protective chemical moiety from the NUSIMER following a stimulus, whereby no change in longitudinal relaxation time is observed. The robustness and change in singlet lifetime of the NUSIMER holds promise for the development of a novel type of biosensors.
Collapse
Affiliation(s)
- Philip Saul
- NMR Signal Enhancement Group , Max-Planck-Institutefor Biophysical Chemistry , Am Faßberg 11 , 37077 Göttingen , Germany .
- Center for Biostructural Imaging of Neurodegeneration of UMG , Von-Siebold-Straße 3A , 37075 Göttingen , Germany
| | - Salvatore Mamone
- NMR Signal Enhancement Group , Max-Planck-Institutefor Biophysical Chemistry , Am Faßberg 11 , 37077 Göttingen , Germany .
- Center for Biostructural Imaging of Neurodegeneration of UMG , Von-Siebold-Straße 3A , 37075 Göttingen , Germany
| | - Stefan Glöggler
- NMR Signal Enhancement Group , Max-Planck-Institutefor Biophysical Chemistry , Am Faßberg 11 , 37077 Göttingen , Germany .
- Center for Biostructural Imaging of Neurodegeneration of UMG , Von-Siebold-Straße 3A , 37075 Göttingen , Germany
| |
Collapse
|
30
|
Kharkov B, Duan X, Tovar ES, Canary JW, Jerschow A. Singlet excitation in the intermediate magnetic equivalence regime and field-dependent study of singlet–triplet leakage. Phys Chem Chem Phys 2019; 21:2595-2600. [DOI: 10.1039/c8cp06883f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Measuring field-dependence of singlet lifetimes in the intermediate magnetic equivalence regime.
Collapse
Affiliation(s)
- Boris Kharkov
- Laboratory of Biomolecular NMR
- Saint Petersburg State University
- Saint Petersburg
- Russia
| | - Xueyou Duan
- Department of Chemistry
- New York University
- New York
- USA
| | | | | | | |
Collapse
|
31
|
Pravdivtsev AN, Sönnichsen F, Hövener JB. OnlyParahydrogen SpectrosopY (OPSY) pulse sequences - One does not fit all. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 297:86-95. [PMID: 30366223 DOI: 10.1016/j.jmr.2018.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 10/06/2018] [Accepted: 10/09/2018] [Indexed: 06/08/2023]
Abstract
The hyperpolarization of nuclear spins using parahydrogen is an interesting effect that allows to increase the magnetic resonance signal by several orders of magnitude. Known as ParaHydrogen And Synthesis Allow Dramatically Enhanced Nuclear Alignment (PASADENA) and ParaHydrogen Induced Polarization (PHIP), the method was successfully used for in vitro analysis and in vivo imaging. In this contribution, we investigated four known and four new variants of Only Parahydrogen SpectroscopY (OPSY) sequences (Aguilar et al., 2007) with respect to the selective preparation of hyperpolarized NMR signal and background suppression. Depending on the method chosen, either anti-phase, in-phase or a mixture of both signals are obtained: anti-phase signals are beneficial to identify hyperpolarized signals and the structure or J-coupling constants; in-phase signals are useful for imaging applications or when the lines are broad. This comprehensive overview of sequences new and old facilitates selecting the right sequence for the task at hand.
Collapse
Affiliation(s)
- Andrey N Pravdivtsev
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Kiel, Germany.
| | - Frank Sönnichsen
- Faculty of Mathematics and Natural Sciences, Chemistry Section, Kiel University, Kiel, Germany
| | - Jan-Bernd Hövener
- Section Biomedical Imaging, Molecular Imaging North Competence Center (MOIN CC), Department of Radiology and Neuroradiology, University Medical Center Kiel, Kiel University, Kiel, Germany
| |
Collapse
|
32
|
Pravdivtsev AN, Kozinenko VP, Hövener JB. Only Para-Hydrogen Spectroscopy (OPSY) Revisited: In-Phase Spectra for Chemical Analysis and Imaging. J Phys Chem A 2018; 122:8948-8956. [PMID: 30293421 DOI: 10.1021/acs.jpca.8b07459] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We revisited only para-hydrogen spectroscopy (OPSY) for the analysis of para-hydrogen-enhanced NMR spectra at high magnetic fields. We found that the sign of the gradients and interpulse delays are pivotal for the performance of the sequence: the variant of double-quantum filter OPSY, where the second time interval is twice as long as the first one (OPSYd-12) converts the antiphase spectrum to in-phase and efficiently suppresses the background signal in a single scan better than the other variants. OPSYd-12 strongly facilitates the analysis of para-hydrogen-derived NMR spectra in homogeneous and inhomogeneous magnetic fields. Furthermore, the net magnetization produced is essential for subsequent applications such as imaging, e.g., in a reaction chamber or in vivo.
Collapse
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 18 , 24118 , Kiel , Germany
| | - Vitaly P Kozinenko
- Novosibirsk State University , Pirogova str. 2 , 630090 , Novosibirsk , Russia.,International Tomography Center SB RAS , Institutskaya str. 3a , 630090 , Novosibirsk , Russia
| | - 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 18 , 24118 , Kiel , Germany
| |
Collapse
|
33
|
Rodin BA, Kiryutin AS, Yurkovskaya AV, Ivanov KL, Yamamoto S, Sato K, Takui T. Using optimal control methods with constraints to generate singlet states in NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 291:14-22. [PMID: 29626735 DOI: 10.1016/j.jmr.2018.03.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/06/2018] [Accepted: 03/09/2018] [Indexed: 06/08/2023]
Abstract
A method is proposed for optimizing the performance of the APSOC (Adiabatic-Passage Spin Order Conversion) technique, which can be exploited in NMR experiments with singlet spin states. In this technique magnetization-to-singlet conversion (and singlet-to-magnetization conversion) is performed by using adiabatically ramped RF-fields. Optimization utilizes the GRAPE (Gradient Ascent Pulse Engineering) approach, in which for a fixed search area we assume monotonicity to the envelope of the RF-field. Such an approach allows one to achieve much better performance for APSOC; consequently, the efficiency of magnetization-to-singlet conversion is greatly improved as compared to simple model RF-ramps, e.g., linear ramps. We also demonstrate that the optimization method is reasonably robust to possible inaccuracies in determining NMR parameters of the spin system under study and also in setting the RF-field parameters. The present approach can be exploited in other NMR and EPR applications using adiabatic switching of spin Hamiltonians.
Collapse
Affiliation(s)
- Bogdan A Rodin
- International Tomography Center SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - 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
| | - Konstantin L Ivanov
- International Tomography Center SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
| | - Satoru Yamamoto
- Graduate School of Science, Osaka City University, Osaka, Sumiyoshi, Osaka 558-8585, Japan
| | - Kazunobu Sato
- Graduate School of Science, Osaka City University, Osaka, Sumiyoshi, Osaka 558-8585, Japan
| | - Takeji Takui
- Graduate School of Science, Osaka City University, Osaka, Sumiyoshi, Osaka 558-8585, Japan
| |
Collapse
|
34
|
Mamone S, Glöggler S. Nuclear spin singlet states as magnetic on/off probes in self-assembling systems. Phys Chem Chem Phys 2018; 20:22463-22467. [DOI: 10.1039/c8cp04448a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nuclear singlet states in thermo-responsive peptides are introduced as magnetic on/off switches.
Collapse
Affiliation(s)
- Salvatore Mamone
- Max Planck Institute for Biophysical Chemistry
- 37077 Göttingen
- Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG
- 37075 Göttingen
| | - Stefan Glöggler
- Max Planck Institute for Biophysical Chemistry
- 37077 Göttingen
- Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG
- 37075 Göttingen
| |
Collapse
|
35
|
Sheberstov KF, Vieth HM, Zimmermann H, Ivanov KL, Kiryutin AS, Yurkovskaya AV. cis Versus trans-Azobenzene: Precise Determination of NMR Parameters and Analysis of Long-Lived States of 15N Spin Pairs. APPLIED MAGNETIC RESONANCE 2017; 49:293-307. [PMID: 29479146 PMCID: PMC5811614 DOI: 10.1007/s00723-017-0968-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/16/2017] [Indexed: 06/08/2023]
Abstract
We provide a detailed evaluation of nuclear magnetic resonance (NMR) parameters of the cis- and trans-isomers of azobenzene (AB). For determining the NMR parameters, such as proton-proton and proton-nitrogen J-couplings and chemical shifts, we compared NMR spectra of three different isotopomers of AB: the doubly 15N labeled azobenzene, 15N,15N'-AB, and two partially deuterated AB isotopomers with a single 15N atom. For the total lineshape analysis of NMR spectra, we used the recently developed ANATOLIA software package. The determined NMR parameters allowed us to optimize experiments for investigating singlet long-lived spin states (LLSs) of 15N spin pairs and to measure LLS lifetimes in cis-AB and trans-AB. Magnetization-to-singlet-to-magnetization conversion has been performed using the SLIC and APSOC techniques, providing a degree of conversion up to 17 and 24% of the initial magnetization, respectively. Our approach is useful for optimizing the performance of experiments with singlet LLSs; such LLSs can be exploited for preserving spin hyperpolarization, for probing slow molecular dynamics, slow chemical processes and also slow transport processes.
Collapse
Affiliation(s)
- Kirill F. Sheberstov
- International Tomography Center SB RAS, Novosibirsk, 630090 Russia
- State Scientific Research Institute of Chemistry and Technology of Organoelement Compounds, Moscow, 105118 Russia
| | - Hans-Martin Vieth
- International Tomography Center SB RAS, Novosibirsk, 630090 Russia
- Freie Universität Berlin, 14195 Berlin, Germany
| | - Herbert Zimmermann
- Department of Biomolecular Mechanisms, Max-Planck-Institut für Medizinische Forschung, 69120 Heidelberg, Germany
| | - Konstantin L. Ivanov
- International Tomography Center SB RAS, Novosibirsk, 630090 Russia
- Novosibirsk State University, Novosibirsk, 630090 Russia
| | - 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
| |
Collapse
|
36
|
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.
Collapse
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
| |
Collapse
|
37
|
Glöggler S, Elliott SJ, Stevanato G, Brown RCD, Levitt MH. Versatile magnetic resonance singlet tags compatible with biological conditions. RSC Adv 2017. [DOI: 10.1039/c7ra05196d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The long lifetime of nuclear singlet states holds promise for the development of molecular tracers to study motional processes in proteins with increased precision or to act as imaging contrast agents.
Collapse
Affiliation(s)
- Stefan Glöggler
- School of Chemistry
- University of Southampton
- Southampton SO171BJ
- UK
| | | | | | | | | |
Collapse
|