1
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Qi C, Mankinen O, Telkki VV, Hilty C. Measuring Protein-Ligand Binding by Hyperpolarized Ultrafast NMR. J Am Chem Soc 2024; 146:5063-5066. [PMID: 38373110 PMCID: PMC10910566 DOI: 10.1021/jacs.3c14359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 02/06/2024] [Accepted: 02/12/2024] [Indexed: 02/21/2024]
Abstract
Protein-ligand interactions can be detected by observing changes in the transverse relaxation rates of the ligand upon binding. The ultrafast NMR technique, which correlates the chemical shift with the transverse relaxation rate, allows for the simultaneous acquisition of R2 for carbon spins at different positions. In combination with dissolution dynamic nuclear polarization (D-DNP), where the signal intensity is enhanced by thousands of times, the R2 values of several carbon signals from unlabeled benzylamine are observable within a single scan. The hyperpolarized ultrafast chemical shift-R2 correlated experiment separates chemical shift encoding from the readout phase in the NMR pulse sequence, which allows it to beat the fundamental limit on the spectral resolution otherwise imposed by the sampling theorem. Applications enabled by the ability to measure multiple relaxation rates in a single scan include the study of structural properties of protein-ligand interactions.
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Affiliation(s)
- Chang Qi
- Chemistry
Department, Texas A&M University, College Station, Texas 77843-3255, United
States
| | - Otto Mankinen
- NMR
Research Unit, Faculty of Science, University
of Oulu, 90014 Oulu, Finland
| | - Ville-Veikko Telkki
- NMR
Research Unit, Faculty of Science, University
of Oulu, 90014 Oulu, Finland
| | - Christian Hilty
- Chemistry
Department, Texas A&M University, College Station, Texas 77843-3255, United
States
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2
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Patel RJS, Harlan CJ, Fuentes DT, Bankson JA. A Simulation of the Effects of Diffusion on Hyperpolarized [1- 13C]-Pyruvate Signal Evolution. IEEE Trans Biomed Eng 2023; 70:2905-2913. [PMID: 37097803 PMCID: PMC10538435 DOI: 10.1109/tbme.2023.3269665] [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] [Indexed: 04/26/2023]
Abstract
OBJECTIVE Hyperpolarized [1-13C]-pyruvate magnetic resonance imaging is an emerging metabolic imaging method that offers unprecedented spatiotemporal resolution for monitoring tumor metabolism in vivo. To establish robust imaging biomarkers of metabolism, we must characterize phenomena that may modulate the apparent pyruvate-to-lactate conversion rate (kPL). Here, we investigate the potential effect of diffusion on pyruvate-to-lactate conversion, as failure to account for diffusion in pharmacokinetic analysis may obscure true intracellular chemical conversion rates. METHODS Changes in hyperpolarized pyruvate and lactate signal were calculated using a finite-difference time domain simulation of a two-dimensional tissue model. Signal evolution curves with intracellular kPL values from 0.02 to 1.00 s-1 were analyzed using spatially invariant one-compartment and two-compartment pharmacokinetic models. A second spatially variant simulation incorporating compartmental instantaneous mixing was fit with the same one-compartment model. RESULTS When fitting with the one-compartment model, apparent kPL underestimated intracellular kPL by approximately 50% at an intracellular kPL of 0.02 s-1. This underestimation increased for larger kPL values. However, fitting the instantaneous mixing curves showed that diffusion accounted for only a small part of this underestimation. Fitting with the two-compartment model yielded more accurate intracellular kPL values. SIGNIFICANCE This work suggests diffusion is not a significant rate-limiting factor in pyruvate-to-lactate conversion given that our model assumptions hold true. In higher order models, diffusion effects may be accounted for by a term characterizing metabolite transport. Pharmacokinetic models used to analyze hyperpolarized pyruvate signal evolution should focus on carefully selecting the analytical model for fitting rather than accounting for diffusion effects.
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3
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Theillet FX, Luchinat E. In-cell NMR: Why and how? PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2022; 132-133:1-112. [PMID: 36496255 DOI: 10.1016/j.pnmrs.2022.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 04/19/2022] [Accepted: 04/27/2022] [Indexed: 06/17/2023]
Abstract
NMR spectroscopy has been applied to cells and tissues analysis since its beginnings, as early as 1950. We have attempted to gather here in a didactic fashion the broad diversity of data and ideas that emerged from NMR investigations on living cells. Covering a large proportion of the periodic table, NMR spectroscopy permits scrutiny of a great variety of atomic nuclei in all living organisms non-invasively. It has thus provided quantitative information on cellular atoms and their chemical environment, dynamics, or interactions. We will show that NMR studies have generated valuable knowledge on a vast array of cellular molecules and events, from water, salts, metabolites, cell walls, proteins, nucleic acids, drugs and drug targets, to pH, redox equilibria and chemical reactions. The characterization of such a multitude of objects at the atomic scale has thus shaped our mental representation of cellular life at multiple levels, together with major techniques like mass-spectrometry or microscopies. NMR studies on cells has accompanied the developments of MRI and metabolomics, and various subfields have flourished, coined with appealing names: fluxomics, foodomics, MRI and MRS (i.e. imaging and localized spectroscopy of living tissues, respectively), whole-cell NMR, on-cell ligand-based NMR, systems NMR, cellular structural biology, in-cell NMR… All these have not grown separately, but rather by reinforcing each other like a braided trunk. Hence, we try here to provide an analytical account of a large ensemble of intricately linked approaches, whose integration has been and will be key to their success. We present extensive overviews, firstly on the various types of information provided by NMR in a cellular environment (the "why", oriented towards a broad readership), and secondly on the employed NMR techniques and setups (the "how", where we discuss the past, current and future methods). Each subsection is constructed as a historical anthology, showing how the intrinsic properties of NMR spectroscopy and its developments structured the accessible knowledge on cellular phenomena. Using this systematic approach, we sought i) to make this review accessible to the broadest audience and ii) to highlight some early techniques that may find renewed interest. Finally, we present a brief discussion on what may be potential and desirable developments in the context of integrative studies in biology.
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Affiliation(s)
- Francois-Xavier Theillet
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France.
| | - Enrico Luchinat
- Dipartimento di Scienze e Tecnologie Agro-Alimentari, Alma Mater Studiorum - Università di Bologna, Piazza Goidanich 60, 47521 Cesena, Italy; CERM - Magnetic Resonance Center, and Neurofarba Department, Università degli Studi di Firenze, 50019 Sesto Fiorentino, Italy
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4
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Ullah MS, Mankinen O, Zhivonitko VV, Telkki VV. Ultrafast transverse relaxation exchange NMR spectroscopy. Phys Chem Chem Phys 2022; 24:22109-22114. [PMID: 36074123 PMCID: PMC9491048 DOI: 10.1039/d2cp02944h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular exchange between different physical or chemical environments occurs due to either diffusion or chemical transformation. Nuclear magnetic resonance (NMR) spectroscopy provides a means of understanding the molecular exchange in a noninvasive way and without tracers. Here, we introduce a novel two dimensional, single-scan ultrafast Laplace NMR (UF LNMR) method to monitor molecular exchange using transverse relaxation as a contrast. The UF T2–T2 relaxation exchange spectroscopy (REXSY) method shortens the experiment time by one to two orders of magnitude compared to its conventional counterpart. Contrary to the conventional EXSY, the exchanging sites are distinguished based on T2 relaxation times instead of chemical shifts, making the method especially useful for systems including physical exchange of molecules. Therefore, the UF REXSY method offers an efficient means for quantification of exchange processes in various fields such as cellular metabolism and ion transport in electrolytes. As a proof of principle, we studied a halogen-free orthoborate based ionic liquid system and followed molecular exchange between molecular aggregates and free molecules. The results are in good agreement with the conventional exchange studies. Due to the single-scan nature, the method potentially significantly facilitates the use of modern hyperpolarization techniques to boost the sensitivity by several orders of magnitude. An ultrafast two-dimensional NMR method allows quantification of molecular exchange rates efficiently based on T2 relaxation contrast.![]()
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Affiliation(s)
- Md Sharif Ullah
- NMR Research Unit, Faculty of Science, University of Oulu, P.O.Box 3000, 90014 Oulu, Finland.
| | - Otto Mankinen
- NMR Research Unit, Faculty of Science, University of Oulu, P.O.Box 3000, 90014 Oulu, Finland.
| | - Vladimir V Zhivonitko
- NMR Research Unit, Faculty of Science, University of Oulu, P.O.Box 3000, 90014 Oulu, Finland.
| | - Ville-Veikko Telkki
- NMR Research Unit, Faculty of Science, University of Oulu, P.O.Box 3000, 90014 Oulu, Finland.
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5
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Mamone S, Jagtap AP, Korchak S, Ding Y, Sternkopf S, Glöggler S. A Field‐Independent Method for the Rapid Generation of Hyperpolarized [1‐
13
C]Pyruvate in Clean Water Solutions for Biomedical Applications. Angew Chem Int Ed Engl 2022; 61:e202206298. [PMID: 35723041 PMCID: PMC9543135 DOI: 10.1002/anie.202206298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Salvatore Mamone
- Max Planck Institute for Multidisciplinary Sciences NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG NMR Signal Enhancement Group Von-Siebold-Straße 3 A 37075 Göttingen Germany
| | - Anil P. Jagtap
- Max Planck Institute for Multidisciplinary Sciences NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG NMR Signal Enhancement Group Von-Siebold-Straße 3 A 37075 Göttingen Germany
| | - Sergey Korchak
- Max Planck Institute for Multidisciplinary Sciences NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG NMR Signal Enhancement Group Von-Siebold-Straße 3 A 37075 Göttingen Germany
| | - Yonghong Ding
- Max Planck Institute for Multidisciplinary Sciences NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG NMR Signal Enhancement Group Von-Siebold-Straße 3 A 37075 Göttingen Germany
| | - Sonja Sternkopf
- Max Planck Institute for Multidisciplinary Sciences NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG NMR Signal Enhancement Group Von-Siebold-Straße 3 A 37075 Göttingen Germany
| | - Stefan Glöggler
- Max Planck Institute for Multidisciplinary Sciences NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen Germany
- Center for Biostructural Imaging of Neurodegeneration of UMG NMR Signal Enhancement Group Von-Siebold-Straße 3 A 37075 Göttingen Germany
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6
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Kharbanda Y, Urbańczyk M, Zhivonitko VV, Mailhiot S, Kettunen MI, Telkki VV. Sensitive, Efficient and Portable Analysis of Molecular Exchange Processes by Hyperpolarized Ultrafast NMR. Angew Chem Int Ed Engl 2022; 61:e202203957. [PMID: 35499690 PMCID: PMC9400989 DOI: 10.1002/anie.202203957] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Indexed: 11/08/2022]
Abstract
Molecular exchange processes are ubiquitous in nature. Here, we introduce a method to analyze exchange processes by using low-cost, portable, single-sided NMR instruments. The inherent magnetic field inhomogeneity of the single-sided instruments is exploited to achieve diffusion contrast of exchange sites and spatial encoding of 2D data. This so-called ultrafast diffusion exchange spectroscopy method shortens the experiment time by two to four orders of magnitude. Furthermore, because full 2D data are measured in a single scan (in a fraction of a second), the sensitivity of the experiment can be improved by several orders of magnitude using so-called nuclear spin hyperpolarization methods (in this case, dissolution dynamic nuclear polarization). As the first demonstration of the feasibility of the method in various applications, we show that the method enables quantification of intra- and extracellular exchange of water in a yeast cell suspension.
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Affiliation(s)
| | - Mateusz Urbańczyk
- Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
| | | | - Sarah Mailhiot
- NMR Research Unit, University of Oulu, Oulu, 90540, Finland
| | - Mikko I Kettunen
- Kuopio Biomedical Imaging Unit, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
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7
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Mamone S, Jagtap AP, Korchak S, Ding Y, Sternkopf S, Glöggler S. A Field‐Independent Method for the Rapid Generation of Hyperpolarized [1‐13C]Pyruvate in Clean Water Solutions for Biomedical Applications. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Salvatore Mamone
- Max Planck Institute for Multidisciplinary Sciences - Fassberg Campus: Max-Planck-Institut fur Multidisziplinare Naturwissenschaften NMR Signal Enhancement GERMANY
| | - Anil P Jagtap
- Max Planck Institute for Multidisciplinary Sciences: Max-Planck-Institut fur Multidisziplinare Naturwissenschaften NMR Signal Enhancement GERMANY
| | - Sergey Korchak
- Max Planck Institute for Multidisciplinary Sciences: Max-Planck-Institut fur Multidisziplinare Naturwissenschaften NMR Signal Enhancement GERMANY
| | - Yonghong Ding
- Max Planck Institute for Multidisciplinary Sciences: Max-Planck-Institut fur Multidisziplinare Naturwissenschaften NMR Signal Enhancement GERMANY
| | - Sonja Sternkopf
- Max Planck Institute for Multidisciplinary Sciences: Max-Planck-Institut fur Multidisziplinare Naturwissenschaften NMR Signal Enhancement GERMANY
| | - Stefan Glöggler
- Max-Planck-Institute for Biophysical Chemistry NMR Signal Enhancement Group Am Fassberg 11 37077 Göttingen GERMANY
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8
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Pham P, Mandal R, Qi C, Hilty C. Interfacing Liquid State Hyperpolarization Methods with NMR Instrumentation. JOURNAL OF MAGNETIC RESONANCE OPEN 2022; 10-11:100052. [PMID: 35530721 PMCID: PMC9070690 DOI: 10.1016/j.jmro.2022.100052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Advances in liquid state hyperpolarization methods have enabled new applications of high-resolution NMR spectroscopy. Utilizing strong signal enhancements from hyperpolarization allows performing NMR spectroscopy at low concentration, or with high time resolution. Making use of the high, but rapidly decaying hyperpolarization in the liquid state requires new techniques to interface hyperpolarization equipment with liquid state NMR spectrometers. This article highlights rapid injection, high resolution NMR spectroscopy with hyperpolarization produced by the techniques of dissolution dynamic nuclear polarization (D-DNP) and para-hydrogen induced polarization (PHIP). These are popular, albeit not the only methods to produce high polarization levels for liquid samples. Gas and liquid driven sample injection techniques are compatible with both of these hyperpolarization methods. The rapid sample injection techniques are combined with adapted NMR experiments working in a single, or small number of scans. They expand the application of liquid state hyperpolarization to spins with comparably short relaxation times, provide enhanced control over sample conditions, and allow for mixing experiments to study reactions in real time.
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9
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Kharbanda Y, Urbańczyk M, Zhivonitko VV, Mailhiot S, Kettunen MI, Telkki V. Sensitive, Efficient and Portable Analysis of Molecular Exchange Processes by Hyperpolarized Ultrafast NMR. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Mateusz Urbańczyk
- Institute of Physical Chemistry Polish Academy of Sciences Warsaw Poland
| | | | | | - Mikko I. Kettunen
- Kuopio Biomedical Imaging Unit A.I. Virtanen Institute for Molecular Sciences University of Eastern Finland Kuopio Finland
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10
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Qi C, Wang Y, Hilty C. Application of Relaxation Dispersion of Hyperpolarized 13 C Spins to Protein-Ligand Binding. Angew Chem Int Ed Engl 2021; 60:24018-24021. [PMID: 34468077 DOI: 10.1002/anie.202109430] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Indexed: 11/11/2022]
Abstract
Nuclear spin relaxation dispersion parameters are proposed as indicators of the binding mode of a ligand to a protein. Hyperpolarization by dissolution dynamic nuclear polarization (D-DNP) provided a 13 C signal enhancement between 3000-6000 for the ligand 4-(trifluoromethyl) benzene-1-carboximidamide binding to trypsin. The measurement of 13 C R2 relaxation dispersion was enabled without isotope enrichment, using a series of single-scan Carr-Purcell-Meiboom-Gill experiments with variable refocusing delays. The magnitude in dispersion for the spins of the ligand is correlated to the position with respect to the salt bridge between protein and the amidine group of the ligand, indicating the ligand binding orientation. Hyperpolarized relaxation dispersion is an alternative to chemical shift or NOE measurements for determining ligand binding modes.
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Affiliation(s)
- Chang Qi
- Chemistry Department, Texas A&M University, 3255 TAMU, College Station, TX, USA
| | - Yunyi Wang
- Chemistry Department, Texas A&M University, 3255 TAMU, College Station, TX, USA
| | - Christian Hilty
- Chemistry Department, Texas A&M University, 3255 TAMU, College Station, TX, USA
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11
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Qi C, Wang Y, Hilty C. Application of Relaxation Dispersion of Hyperpolarized
13
C Spins to Protein–Ligand Binding. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109430] [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)
- Chang Qi
- Chemistry Department Texas A&M University 3255 TAMU College Station TX USA
| | - Yunyi Wang
- Chemistry Department Texas A&M University 3255 TAMU College Station TX USA
| | - Christian Hilty
- Chemistry Department Texas A&M University 3255 TAMU College Station TX USA
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12
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Telkki VV, Urbańczyk M, Zhivonitko V. Ultrafast methods for relaxation and diffusion. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2021; 126-127:101-120. [PMID: 34852922 DOI: 10.1016/j.pnmrs.2021.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 07/07/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Relaxation and diffusion NMR measurements offer an approach to studying rotational and translational motion of molecules non-invasively, and they also provide chemical resolution complementary to NMR spectra. Multidimensional experiments enable the correlation of relaxation and diffusion parameters as well as the observation of molecular exchange phenomena through relaxation or diffusion contrast. This review describes how to accelerate multidimensional relaxation and diffusion measurements significantly through spatial encoding. This so-called ultrafast Laplace NMR approach shortens the experiment time to a fraction and makes even single-scan experiments possible. Single-scan experiments, in turn, significantly facilitate the use of nuclear spin hyperpolarization methods to boost sensitivity. The ultrafast Laplace NMR method is also applicable with low-field, mobile NMR instruments, and it can be exploited in many disciplines. For example, it has been used in studies of the dynamics of fluids in porous materials, identification of intra- and extracellular metabolites in cancer cells, and elucidation of aggregation phenomena in atmospheric surfactant solutions.
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Affiliation(s)
| | - Mateusz Urbańczyk
- NMR Research Unit, University of Oulu, P.O. Box 3000, FIN-90014, Finland; Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
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13
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Elliott SJ, Stern Q, Ceillier M, El Daraï T, Cousin SF, Cala O, Jannin S. Practical dissolution dynamic nuclear polarization. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2021; 126-127:59-100. [PMID: 34852925 DOI: 10.1016/j.pnmrs.2021.04.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 04/09/2021] [Indexed: 06/13/2023]
Abstract
This review article intends to provide insightful advice for dissolution-dynamic nuclear polarization in the form of a practical handbook. The goal is to aid research groups to effectively perform such experiments in their own laboratories. Previous review articles on this subject have covered a large number of useful topics including instrumentation, experimentation, theory, etc. The topics to be addressed here will include tips for sample preparation and for checking sample health; a checklist to correctly diagnose system faults and perform general maintenance; the necessary mechanical requirements regarding sample dissolution; and aids for accurate, fast and reliable polarization quantification. Herein, the challenges and limitations of each stage of a typical dissolution-dynamic nuclear polarization experiment are presented, with the focus being on how to quickly and simply overcome some of the limitations often encountered in the laboratory.
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Affiliation(s)
- Stuart J Elliott
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Quentin Stern
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Morgan Ceillier
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Théo El Daraï
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Samuel F Cousin
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Olivier Cala
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Sami Jannin
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France.
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14
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Tickner BJ, Zhivonitko VV, Telkki VV. Ultrafast Laplace NMR to study metal-ligand interactions in reversible polarisation transfer from parahydrogen. Phys Chem Chem Phys 2021; 23:16542-16550. [PMID: 34338685 PMCID: PMC8359933 DOI: 10.1039/d1cp02383g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 07/22/2021] [Indexed: 12/11/2022]
Abstract
Laplace Nuclear Magnetic Resonance (NMR) can determine relaxation parameters and diffusion constants, giving valuable information about molecular structure and dynamics. Information about relaxation times (T1 and T2) and the self-diffusion coefficient (D) can be extracted from exponentially decaying NMR signals by performing a Laplace transform, which is a different approach to traditional NMR involving Fourier transform of a free induction decay. Ultrafast Laplace NMR uses spatial encoding to collect the entire data set in just a single scan which provides orders of magnitude time savings. In this work we use ultrafast Laplace NMR D-T2 correlation sequences to measure key relaxation (T2) and diffusion (D) parameters of methanolic solutions containing pyridine. For the first time we combine this technique with the hyperpolarisation technique Signal Amplification By Reversible Exchange (SABRE), which employs an iridium catalyst to reversibly transfer polarisation from parahydrogen, to boost the 1H NMR signals of pyridine by up to 300-fold. We demonstrate use of ultrafast Laplace NMR to monitor changes in pyridine T2 and D associated with ligation to the iridium SABRE catalyst and kinetic isotope exchange reactions. The combined 1440-fold reduction in experiment time and 300-fold 1H NMR signal enhancement allow the determination of pyridine D coefficients and T2 values at 25 mM concentrations in just 3 seconds using SABRE hyperpolarised ultrafast Laplace NMR.
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Affiliation(s)
- Ben. J. Tickner
- NMR Research Unit, Faculty of Science, University of Oulu90014Finland
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15
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Singh K, Jacquemmoz C, Giraudeau P, Frydman L, Dumez JN. Ultrafast 2D 1H- 1H NMR spectroscopy of DNP-hyperpolarised substrates for the analysis of mixtures. Chem Commun (Camb) 2021; 57:8035-8038. [PMID: 34291258 PMCID: PMC8477446 DOI: 10.1039/d1cc03079e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 07/15/2021] [Indexed: 01/22/2023]
Abstract
We show that TOCSY and multiple-quantum (MQ) 2D NMR spectra can be obtained for mixtures of substrates hyperpolarised by dissolution dynamic nuclear polarisation (D-DNP). This is achieved by combining optimised transfer settings for D-DNP, with ultrafast 2D NMR experiments based on spatiotemporal encoding. TOCSY and MQ experiments are particularly well suited for mixture analysis, and this approach opens the way to significant sensitivity gains for analytical applications of NMR, such as authentication and metabolomics.
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Affiliation(s)
- Kawarpal Singh
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel.
| | | | | | - Lucio Frydman
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel.
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16
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Zhan H, Zhan F, Gao C, Lin E, Huang C, Lin X, Huang Y, Chen Z. Multiplet analysis by strong-coupling-artifact-suppression 2D J-resolved NMR spectroscopy. J Chem Phys 2021; 155:034202. [PMID: 34293873 DOI: 10.1063/5.0056999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Benefitting from the capability of recording scalar (J) couplings and bonding information, 2D J-resolved NMR spectroscopy constitutes an important tool for molecular structure analysis and mixture component identification. Unfortunately, conventional 2D J-resolved experiments generally encounter challenges of insufficient spectral resolution and strong coupling artifacts. In this study, a general NMR approach is exploited to record absorption-mode artifact-free 2D J-resolved spectra. This proposal adopts the advanced triple-spin-echo pure shift yielded by chirp excitation element to eliminate J coupling splittings and preserve chemical shifts along the F2 dimension, and it additionally utilizes the echo-train J acquisition to reveal the multiplet structure along the F1 dimension in accelerated experimental acquisition. Thus, it permits one to extract multiplet structure information from crowded spectral regions in one-shot experiments, with considerable resolution advantage resulting from completely decoupling F2 dimension and absorption-mode presentation, thus facilitating analysis on complex samples. More importantly, this method grants the superior performance on suppressing strong coupling artifacts, which have been affirmed by experiments on a series of chemical samples. As a consequence, this proposed method serves as a useful tool for J coupling measurements and multiplet structure analyses on complex samples that contain crowded NMR resonances and strong coupling spin systems, and it may exhibit broad application potentials in fields of physics, chemistry, and medical science, among others.
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Affiliation(s)
- Haolin Zhan
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Fengqi Zhan
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Cunyuan Gao
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Enping Lin
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Chengda Huang
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Xiaoqing Lin
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Yuqing Huang
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Zhong Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
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17
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Zhan H, Hao M, Feng Y, Cao S, Ni Z, Huang Y, Chen Z. Diffusion Analysis on Complex Mixtures under Adverse Magnetic Field Conditions by Spatially-Selective Pure Shift-Based DOSY. J Phys Chem Lett 2021; 12:1073-1080. [PMID: 33471531 DOI: 10.1021/acs.jpclett.0c03549] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Diffusion-ordered NMR spectroscopy (DOSY) serves as a noninvasive spectroscopic method for studying intact mixtures and identifying individual components present in mixtures according to their diffusion behaviors. However, DOSY techniques generally fail to discriminate complex compositions which exhibit crowded or overlapped NMR signals, particularly under adverse magnetic field conditions. Herein, we exploit the spatially selective pure shift-based DOSY strategy to address this challenge by eliminating inhomogeneous line broadenings and extracting pure shift singlets, thereby expediting diffusion analyses on complex mixtures. More importantly, this strategy is further applied to observing and analyzing electro-oxidation processes of blended alcohols, suggesting its potential to monitoring in situ electrochemical reactions. This study demonstrates a meaningful NMR trial for diffusion analysis on complex mixtures under adverse experimental circumstances, and particularly, it provides a proof-of-concept technique for electrochemical studies and shows promising prospects for applications in chemistry, biology, energy, etc.
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Affiliation(s)
- 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, Xiamen, China
| | - Mengyou Hao
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China
| | - Ye Feng
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China
| | - Shuohui Cao
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 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, Xiamen, 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, Xiamen, 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, Xiamen, China
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18
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Dey A, Charrier B, Martineau E, Deborde C, Gandriau E, Moing A, Jacob D, Eshchenko D, Schnell M, Melzi R, Kurzbach D, Ceillier M, Chappuis Q, Cousin SF, Kempf JG, Jannin S, Dumez JN, Giraudeau P. Hyperpolarized NMR Metabolomics at Natural 13C Abundance. Anal Chem 2020; 92:14867-14871. [PMID: 33136383 PMCID: PMC7705890 DOI: 10.1021/acs.analchem.0c03510] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/15/2020] [Indexed: 12/14/2022]
Abstract
Metabolomics plays a pivotal role in systems biology, and NMR is a central tool with high precision and exceptional resolution of chemical information. Most NMR metabolomic studies are based on 1H 1D spectroscopy, severely limited by peak overlap. 13C NMR benefits from a larger signal dispersion but is barely used in metabolomics due to ca. 6000-fold lower sensitivity. We introduce a new approach, based on hyperpolarized 13C NMR at natural abundance, that circumvents this limitation. A new untargeted NMR-based metabolomic workflow based on dissolution dynamic nuclear polarization (d-DNP) for the first time enabled hyperpolarized natural abundance 13C metabolomics. Statistical analysis of resulting hyperpolarized 13C data distinguishes two groups of plant (tomato) extracts and highlights biomarkers, in full agreement with previous results on the same biological model. We also optimize parameters of the semiautomated d-DNP system suitable for high-throughput studies.
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Affiliation(s)
- Arnab Dey
- Université
de Nantes, CNRS, CEISAM UMR
6230, F-44000 Nantes, France
| | - Benoît Charrier
- Université
de Nantes, CNRS, CEISAM UMR
6230, F-44000 Nantes, France
| | - Estelle Martineau
- Université
de Nantes, CNRS, CEISAM UMR
6230, F-44000 Nantes, France
- SpectroMaitrise,
CAPACITES SAS, F-44000 Nantes, France
| | - Catherine Deborde
- INRAE,
Univ. Bordeaux, UMR Biologie du Fruit et Pathologie, Centre INRAE de Nouvelle Aquitaine-Bordeaux, F-33140 Villenave
d’Ornon, France
- Bordeaux
Metabolome, MetaboHUB, Centre INRAE de Nouvelle
Aquitaine-Bordeaux, F-33140 Villenave d’Ornon, France
| | - Elodie Gandriau
- Université
de Nantes, CNRS, CEISAM UMR
6230, F-44000 Nantes, France
| | - Annick Moing
- INRAE,
Univ. Bordeaux, UMR Biologie du Fruit et Pathologie, Centre INRAE de Nouvelle Aquitaine-Bordeaux, F-33140 Villenave
d’Ornon, France
- Bordeaux
Metabolome, MetaboHUB, Centre INRAE de Nouvelle
Aquitaine-Bordeaux, F-33140 Villenave d’Ornon, France
| | - Daniel Jacob
- INRAE,
Univ. Bordeaux, UMR Biologie du Fruit et Pathologie, Centre INRAE de Nouvelle Aquitaine-Bordeaux, F-33140 Villenave
d’Ornon, France
- Bordeaux
Metabolome, MetaboHUB, Centre INRAE de Nouvelle
Aquitaine-Bordeaux, F-33140 Villenave d’Ornon, France
| | - Dmitry Eshchenko
- Bruker
Biospin, Industriestrasse
26, 8117 Fällanden, Switzerland
| | - Marc Schnell
- Bruker
Biospin, Industriestrasse
26, 8117 Fällanden, Switzerland
| | | | - Dennis Kurzbach
- University
of Vienna, Faculty of Chemistry, Institute of Biological Chemistry, Währinger Str. 38, 1090 Vienna, Austria
| | - Morgan Ceillier
- Université
de Lyon, CNRS, Université Claude
Bernard Lyon 1, ENS de Lyon, Centre de RMN à Très Hauts Champs (CRMN),
FRE 2034, F-69100 Villeurbanne, France
| | - Quentin Chappuis
- Université
de Lyon, CNRS, Université Claude
Bernard Lyon 1, ENS de Lyon, Centre de RMN à Très Hauts Champs (CRMN),
FRE 2034, F-69100 Villeurbanne, France
| | - Samuel F. Cousin
- Université
de Lyon, CNRS, Université Claude
Bernard Lyon 1, ENS de Lyon, Centre de RMN à Très Hauts Champs (CRMN),
FRE 2034, F-69100 Villeurbanne, France
| | - James G. Kempf
- Bruker
Biospin, 15 Fortune Dr., Billerica, Massachusetts 01821, United States
| | - Sami Jannin
- Université
de Lyon, CNRS, Université Claude
Bernard Lyon 1, ENS de Lyon, Centre de RMN à Très Hauts Champs (CRMN),
FRE 2034, F-69100 Villeurbanne, France
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19
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Korchak S, Jagtap AP, Glöggler S. Signal-enhanced real-time magnetic resonance of enzymatic reactions at millitesla fields. Chem Sci 2020; 12:314-319. [PMID: 34163599 PMCID: PMC8178804 DOI: 10.1039/d0sc04884d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The phenomenon of nuclear magnetic resonance (NMR) is widely applied in biomedical and biological science to study structures and dynamics of proteins and their reactions. Despite its impact, NMR is an inherently insensitive phenomenon and has driven the field to construct spectrometers with increasingly higher magnetic fields leading to more detection sensitivity. Here, we are demonstrating that enzymatic reactions can be followed in real-time at millitesla fields, three orders of magnitude lower than the field of state-of-the-art NMR spectrometers. This requires signal-enhancing samples via hyperpolarization. Within seconds, we have enhanced the signals of 2-13C-pyruvate, an important metabolite to probe cancer metabolism, in 22 mM concentrations (up to 10.1% ± 0.1% polarization) and show that such a large signal allows for the real-time detection of enzymatic conversion of pyruvate to lactate at 24 mT. This development paves the pathways for biological studies in portable and affordable NMR systems with a potential for medical diagnostics. We demonstrate that metabolism can be monitored in real-time with magnetic resonance at milli-tesla fields that are 1000 fold lower than state-of-the-art high field spectrometers.![]()
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Affiliation(s)
- Sergey Korchak
- NMR Signal Enhancement Group, Max-Planck-Insitute for Biophysical Chemistry Am Faßberg 11 37077 Göttingen Germany .,Center for Biostructural Imaging of Neurodegeneration of UMG Von-Siebold-Str. 3A 37075 Göttingen Germany
| | - Anil P Jagtap
- NMR Signal Enhancement Group, Max-Planck-Insitute for Biophysical Chemistry Am Faßberg 11 37077 Göttingen Germany .,Center for Biostructural Imaging of Neurodegeneration of UMG Von-Siebold-Str. 3A 37075 Göttingen Germany
| | - Stefan Glöggler
- NMR Signal Enhancement Group, Max-Planck-Insitute for Biophysical Chemistry Am Faßberg 11 37077 Göttingen Germany .,Center for Biostructural Imaging of Neurodegeneration of UMG Von-Siebold-Str. 3A 37075 Göttingen Germany
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20
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Abstract
The exchange of molecules between different physical or chemical environments due to diffusion or chemical transformations has a crucial role in a plethora of fundamental processes such as breathing, protein folding, chemical reactions and catalysis. Here, we introduce a method for a single-scan, ultrafast NMR analysis of molecular exchange based on the diffusion coefficient contrast. The method shortens the experiment time by one to four orders of magnitude. Consequently, it opens the way for high sensitivity quantification of important transient physical and chemical exchange processes such as in cellular metabolism. As a proof of principle, we demonstrate that the method reveals the structure of aggregates formed by surfactants relevant to aerosol research. Analysis of exchange processes is time consuming by two-dimensional exchange NMR spectroscopy. Here the authors demonstrate a single-scan ultrafast Laplace NMR approach based on spatial encoding to measure molecular diffusion, with an increase by a factor six in the sensitivity per unit time.
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21
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Liu J, Cai C, Wang Y, Liu Y, Huang L, Tian T, Yao Y, Wei J, Chen R, Zhang K, Liu B, Qian K. A Biomimetic Plasmonic Nanoreactor for Reliable Metabolite Detection. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1903730. [PMID: 32440487 PMCID: PMC7237842 DOI: 10.1002/advs.201903730] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 01/30/2020] [Accepted: 02/17/2020] [Indexed: 05/20/2023]
Abstract
Reliable monitoring of metabolites in biofluids is critical for diagnosis, treatment, and long-term management of various diseases. Although widely used, existing enzymatic metabolite assays face challenges in clinical practice primarily due to the susceptibility of enzyme activity to external conditions and the low sensitivity of sensing strategies. Inspired by the micro/nanoscale confined catalytic environment in living cells, the coencapsulation of oxidoreductase and metal nanoparticles within the nanopores of macroporous silica foams to fabricate all-in-one bio-nanoreactors is reported herein for use in surface-enhanced Raman scattering (SERS)-based metabolic assays. The enhancement of catalytical activity and stability of enzyme against high temperatures, long-time storage or proteolytic agents are demonstrated. The nanoreactors recognize and catalyze oxidation of the metabolite, and provide ratiometric SERS response in the presence of the enzymatic by-product H2O2, enabling sensitive metabolite quantification in a "sample in and answer out" manner. The nanoreactor makes any oxidoreductase-responsible metabolite a candidate for quantitative SERS sensing, as shown for glucose and lactate. Glucose levels of patients with bacterial infection are accurately analyzed with only 20 µL of cerebrospinal fluids, indicating the potential application of the nanoreactor in vitro clinical testing.
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Affiliation(s)
- Jiangang Liu
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
| | - Chenlei Cai
- Department of Medical OncologyShanghai Pulmonary HospitalTongji University School of MedicineShanghai200433China
| | - Yuning Wang
- Department of ChemistryInstitutes of Biomedical Sciences and State Key Lab of Molecular Engineering of PolymersFudan UniversityShanghai200438China
| | - Yu Liu
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
| | - Lin Huang
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
| | - Tongtong Tian
- Department of ChemistryInstitutes of Biomedical Sciences and State Key Lab of Molecular Engineering of PolymersFudan UniversityShanghai200438China
| | - Yuanyuan Yao
- Department of ChemistryInstitutes of Biomedical Sciences and State Key Lab of Molecular Engineering of PolymersFudan UniversityShanghai200438China
| | - Jia Wei
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
| | - Ruoping Chen
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
| | - Kun Zhang
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
| | - Baohong Liu
- Department of ChemistryInstitutes of Biomedical Sciences and State Key Lab of Molecular Engineering of PolymersFudan UniversityShanghai200438China
| | - Kun Qian
- Department of NeurosurgeryShanghai Children's HospitalMed‐X Research Institute and School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200062China
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22
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Zhivonitko VV, Ullah MS, Telkki VV. Nonlinear sampling in ultrafast Laplace NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 307:106571. [PMID: 31445478 DOI: 10.1016/j.jmr.2019.106571] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 08/09/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Ultrafast Laplace NMR (UF-LNMR) reduces the experiment time of multidimensional relaxation and diffusion measurements to a fraction. Here, we demonstrate a method for nonlinear (in this case logarithmic) sampling of the indirect dimension in UF-LNMR measurements. The method is based on the use of frequency-swept pulses with the frequency nonlinearly increasing with time. This leads to an optimized detection of exponential experimental data and significantly improved resolution of LNMR parameters.
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Affiliation(s)
| | - Md Sharif Ullah
- NMR Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
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