1
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Pokora M, Paneth A, Paneth P. Non-Covalent Isotope Effects. J Phys Chem Lett 2023; 14:3735-3742. [PMID: 37042752 PMCID: PMC10123821 DOI: 10.1021/acs.jpclett.3c00610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 04/04/2023] [Indexed: 06/19/2023]
Abstract
In this Perspective, we present examples of isotope effects that originate from noncovalent interactions, mainly hydrogen bonding, electrostatics, and confinement. They are traditionally widely used in isotopic enrichment processes, as well as in studies of mechanisms of different (bio)chemical and physical phenomena. We then show the emerging areas of their applications, mainly medical and material sciences. We stress that these emerging applications require either high enrichment or isotopic substitution, which requires the development of new effective techniques of isotopic purification.
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Affiliation(s)
- Mateusz Pokora
- International
Center of Research on Innovative Biobased Materials (ICRI-BioM) −
International Research Agenda, Lodz University
of Technology, Stefanowskiego 2/22, 90-924 Lodz, Poland
| | - Agata Paneth
- Chair
and Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Lublin, Chodzki 4A, 20-093 Lublin, Poland
| | - Piotr Paneth
- International
Center of Research on Innovative Biobased Materials (ICRI-BioM) −
International Research Agenda, Lodz University
of Technology, Stefanowskiego 2/22, 90-924 Lodz, Poland
- Institute
of Applied Radiation Chemistry, Lodz University
of Technology, Zeromskiego
116, 90-537 Lodz, Poland
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2
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Khan AM, Gharasoo M, Wick LY, Thullner M. Phase-specific stable isotope fractionation effects during combined gas-liquid phase exchange and biodegradation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 309:119737. [PMID: 35817302 DOI: 10.1016/j.envpol.2022.119737] [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: 02/24/2022] [Revised: 06/28/2022] [Accepted: 07/04/2022] [Indexed: 06/15/2023]
Abstract
Stable isotope fractionation of toluene under dynamic phase exchange was studied aiming at ascertaining the effects of gas-liquid partitioning and biodegradation of toluene stable isotope composition in liquid-air phase exchange reactors (Laper). The liquid phase consisted of a mixture of aqueous minimal media, a known amount of a mixture of deuterated (toluene-d) and non-deuterated toluene (toluene-h), and bacteria of toluene degrading strain Pseudomonas putida KT2442. During biodegradation experiments, the liquid and air-phase concentrations of both toluene isotopologues were monitored to determine the observable stable isotope fractionation in each phase. The results show a strong fractionation in both phases with apparent enrichment factors beyond -800‰. An offset was observed between enrichment factors in the liquid and the gas phase with gas-phase values showing a stronger fractionation in the gas than in the liquid phase. Numerical simulation and parameter fitting routine was used to challenge hypotheses to explain the unexpected experimental data. The numerical results showed that either a very strong, yet unlikely, fractionation of the phase exchange process or a - so far unreported - direct consumption of gas phase compounds by aqueous phase microorganisms could explain the observed fractionation effects. The observed effect can be of relevance for the analysis of volatile contaminant biodegradation using stable isotope analysis in unsaturated subsurface compartments or other environmental compartment containing a gas and a liquid phase.
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Affiliation(s)
- Ali M Khan
- Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Leipzig, Germany
| | - Mehdi Gharasoo
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Lukas Y Wick
- Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Leipzig, Germany
| | - Martin Thullner
- Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Leipzig, Germany.
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3
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Rostkowski M, Schürner HKV, Sowińska A, Vasquez L, Przydacz M, Elsner M, Dybala-Defratyka A. Isotope Effects on the Vaporization of Organic Compounds from an Aqueous Solution-Insight from Experiment and Computations. J Phys Chem B 2021; 125:13868-13885. [PMID: 34908428 PMCID: PMC8724799 DOI: 10.1021/acs.jpcb.1c05574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
An isotope fractionation
analysis of organic groundwater pollutants
can assess the remediation at contaminated sites yet needs to consider
physical processes as potentially confounding factors. This study
explores the predictability of water–air partitioning isotope
effects from experiments and computational predictions for benzene
and trimethylamine (both H-bond acceptors) as well as chloroform (H-bond
donor). A small, but significant, isotope fractionation of different
direction and magnitude was measured with ε = −0.12‰
± 0.07‰ (benzene), εC = 0.49‰
± 0.23‰ (triethylamine), and εH = 1.79‰
± 0.54‰ (chloroform) demonstrating that effects do not
correlate with expected hydrogen-bond functionalities. Computations
revealed that the overall isotope effect arises from contributions
of different nature and extent: a weakening of intramolecular vibrations
in the condensed phase plus additional vibrational modes from a complexation
with surrounding water molecules. Subtle changes in benzene contrast
with a stronger coupling between intra- and intermolecular modes in
the chloroform–water system and a very local vibrational response
with few atoms involved in a specific mode of triethylamine. An energy
decomposition analysis revealed that each system was affected differently
by electrostatics and dispersion, where dispersion was dominant for
benzene and electrostatics dominated for chloroform and triethylamine.
Interestingly, overall stabilization patterns in all studied systems
originated from contributions of dispersion rather than other energy
terms.
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Affiliation(s)
- Michał Rostkowski
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Heide K V Schürner
- Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Elisabeth-Winterhalter-Weg 6, 81377 Munich, Germany
| | - Agata Sowińska
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Luis Vasquez
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Martyna Przydacz
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Martin Elsner
- Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Elisabeth-Winterhalter-Weg 6, 81377 Munich, Germany
| | - Agnieszka Dybala-Defratyka
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
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4
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Julien M, Liégeois M, Höhener P, Paneth P, Remaud GS. Intramolecular non-covalent isotope effects at natural abundance associated with the migration of paracetamol in solid matrices during liquid chromatography. J Chromatogr A 2021; 1639:461932. [PMID: 33535117 DOI: 10.1016/j.chroma.2021.461932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 10/22/2022]
Abstract
Position-specific isotope analysis by Nuclear Magnetic Resonance spectrometry was employed to study the 13C intramolecular isotopic fractionation associated with the migration of organic substrates through different stationary phases chromatography columns. Liquid chromatography is often used to isolate compounds prior to their isotope analysis and this purification step potentially alters the isotopic composition of target compounds introducing a bias in the later measured data. Moreover, results from liquid chromatography can yield the sorption parameters needed in reactive transport models that predict the transport and fate of organic contaminants to in the environment. The aim of this study was to use intramolecular isotope analysis to study both 13C and 15N isotope effects associated with the elution of paracetamol (acetaminophen) through different stationary phases and to compare them to effects observed previously for vanillin. Results showed very different intramolecular isotope fractionation profiles depending on the chemical structure of the stationary phase. The data also demonstrate that both the amplitude and the distribution of measured isotope effects depend on the nature of the non-covalent interactions involved in the migration process. Results provided by theoretical calculation performed during this study also confirmed the direct link between observed intramolecular isotope fractionation and the nature of involved intermolecular interactions. It is concluded that the nature of the stationary phase through which the substrate passes has a major impact on the intramolecular isotopic composition of organic compounds isolated by chromatography methods..
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Affiliation(s)
- Maxime Julien
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ōokayama, Meguro-ku, Tokyo, 152-8551 Japan; Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France.
| | | | - Patrick Höhener
- University of Aix-Marseille-CNRS, Laboratoire Chimie Environnement, UMR 7376, place Victor Hugo 3, 13331 Marseille, France
| | - Piotr Paneth
- Institute of Applied Radiation Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Gérald S Remaud
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
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5
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Akoka S, Remaud GS. NMR-based isotopic and isotopomic analysis. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2020; 120-121:1-24. [PMID: 33198965 DOI: 10.1016/j.pnmrs.2020.07.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 07/01/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
Molecules exist in different isotopic compositions and most of the processes, physical or chemical, in living systems cause selection between heavy and light isotopes. Thus, knowing the isotopic fractionation of the common atoms, such as H, C, N, O or S, at each step during a metabolic pathway allows the construction of a unique isotope profile that reflects its past history. Having access to the isotope abundance gives valuable clues about the (bio)chemical origin of biological or synthetic molecules. Whereas the isotope ratio measured by mass spectrometry provides a global isotope composition, quantitative NMR measures isotope ratios at individual positions within a molecule. We present here the requirements and the corresponding experimental strategies to use quantitative NMR for measuring intramolecular isotope profiles. After an introduction showing the historical evolution of NMR for measuring isotope ratios, the vocabulary and symbols - for describing the isotope content and quantifying its change - are defined. Then, the theoretical framework of very accurate quantitative NMR is presented as the principle of Isotope Ratio Measurement by NMR spectroscopy, including the practical aspects with nuclei other than 2H, that have been developed and employed to date. Lastly, the most relevant applications covering three issues, tackling counterfeiting, authentication, and forensic investigation, are presented, before giving some perspectives combining technical improvements and methodological approaches.
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Affiliation(s)
- Serge Akoka
- Université de Nantes, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France.
| | - Gérald S Remaud
- Université de Nantes, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France.
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Klajman K, Dybala-Defratyka A, Paneth P. Computational Investigations of Position-Specific Vapor Pressure Isotope Effects in Ethanol-Toward More Powerful Isotope Models for Food Forensics. ACS OMEGA 2020; 5:18499-18506. [PMID: 32743228 PMCID: PMC7393642 DOI: 10.1021/acsomega.0c02446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 07/01/2020] [Indexed: 05/10/2023]
Abstract
With the advent of new experimental techniques, measurements of individual, per-position, vapor pressure isotope effects (VPIEs) became possible. Frequently, they are in opposite directions (larger and smaller than unity), leading to the cancellation when only bulk values are determined. This progress has not been yet paralleled by the theoretical description of phase change processes that would allow for computational prediction of the values of these isotope effects. Herein, we present the first computational protocol that allowed us to predict carbon VPIEs for ethanol-the molecule of great importance in authentication protocols that rely on the precise information about position-specific isotopic composition. Only the model comprising explicit treatment of the surrounding first-shell molecules provided good agreement with the measured values of isotope effects. Additionally, we find that the internal vibrations of molecules of the model to predict isotope effects work better than the entire set of normal modes of the system.
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Affiliation(s)
- Kamila Klajman
- Institute
of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
- Product
Authentication Laboratory, Bionanopark Ltd., Dubois 114/116, 93-465 Lodz, Poland
| | - Agnieszka Dybala-Defratyka
- Institute
of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Piotr Paneth
- Institute
of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
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7
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Zamane S, Gori D, Höhener P. Multistep partitioning causes significant stable carbon and hydrogen isotope effects during volatilization of toluene and propan-2-ol from unsaturated sandy aquifer sediment. CHEMOSPHERE 2020; 251:126345. [PMID: 32169696 DOI: 10.1016/j.chemosphere.2020.126345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 02/21/2020] [Accepted: 02/25/2020] [Indexed: 06/10/2023]
Abstract
This study aimed at investigating whether stable isotopes can be used to monitor the progress of volatile organic compounds (VOCs) volatilization from contaminated sediment during venting. Batches of a dry aquifer sediment were packed into stainless steel HPLC columns, humidified with distilled water and later contaminated by either liquid toluene or propan-2-ol. The VOCs were then volatilized by a stream of gas at room temperature, and the concentrations and stable isotope ratios of gaseous VOCs were recorded by isotope-ratio mass spectrometry. During early stages of volatilization of toluene, the isotope ratios Δδ13C shifted to more negative values by about -3 to -5‰ and the Δδ2H by more than -40‰, while the concentration remained at or near initial saturated vapor concentration. Depletion of the isotope ratios in the gas was explained by the vapor-liquid fractionation process, which is amplified by successive self-partitioning steps of gaseous VOC into remaining liquid VOC. For propan-2-ol the carbon isotope shift was negative like for toluene, whereas the H shift was positive. Hydrogen bonding in the liquid propan-2-ol phase causes a normal vapor-liquid H isotope effect which was described already in classical literature. The isotope shifts in the present experiments are larger than previously reported shifts due to phase-change processes and reach the magnitude of shifts usually observed in kinetic isotope fractionation.
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Affiliation(s)
- Sarah Zamane
- Aix Marseille University - CNRS, UMR 7376, Laboratory of Environmental Chemistry, Marseille, France
| | - Didier Gori
- Aix Marseille University - CNRS, UMR 7376, Laboratory of Environmental Chemistry, Marseille, France
| | - Patrick Höhener
- Aix Marseille University - CNRS, UMR 7376, Laboratory of Environmental Chemistry, Marseille, France.
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8
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Julien M, Gori D, Höhener P, Robins RJ, Remaud GS. Intramolecular isotope effects during permanganate oxidation and acid hydrolysis of methyl tert-butyl ether. CHEMOSPHERE 2020; 248:125975. [PMID: 32007772 DOI: 10.1016/j.chemosphere.2020.125975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 10/01/2019] [Accepted: 01/19/2020] [Indexed: 06/10/2023]
Abstract
Stable isotopes have been widely used to monitor remediation of environmental contaminants over the last decades. This approach gives a good mechanistic description of natural or assisted degradation of organic pollutants, such as methyl tert-butyl ether (MTBE). Since abiotic degradation seems to be the most promising assisted attenuation method, the isotopic fractionation associated with oxidation and hydrolysis processes need to be further investigated in order to understand better these processes and make their monitoring more efficient. In this study, position-specific isotope effects (PSIEs) associated with permanganate oxidation and acid hydrolysis of MTBE were determined using isotope ratio monitoring by 13C Nuclear Magnetic Resonance Spectrometry (irm-13C NMR) combined with isotope ratio monitoring by Mass Spectrometry (irm-MS). The use of this Position-Specific Isotopic Analysis (PSIA) method makes it possible to observe a specific normal isotope effect (IE) associated with each of these two abiotic degradation mechanisms. The present work demonstrates that the 13C isotope pattern of the main degradation product, tert-butyl alcohol (TBA), depends on the chemical reaction by which it is produced. Furthermore, this study also demonstrates that PSIA at natural abundance can give new insights into reaction mechanisms and that this methodology is very promising for the future of modeling the remediation of organic contaminants.
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Affiliation(s)
- Maxime Julien
- Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8503, Japan; EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 Rue de la Houssinière BP 92208, F-44322, Nantes, France.
| | - Didier Gori
- University of Aix-Marseille-CNRS, Laboratoire Chimie Environnement, UMR 7376, Place Victor Hugo 3, 13331 Marseille, France
| | - Patrick Höhener
- University of Aix-Marseille-CNRS, Laboratoire Chimie Environnement, UMR 7376, Place Victor Hugo 3, 13331 Marseille, France
| | - Richard J Robins
- EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 Rue de la Houssinière BP 92208, F-44322, Nantes, France
| | - Gérald S Remaud
- EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 Rue de la Houssinière BP 92208, F-44322, Nantes, France
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9
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Joubert V, Silvestre V, Ladroue V, Besacier F, Blondel P, Akoka S, Baguet E, Remaud GS. Forensic application of position-specific isotopic analysis of trinitrotoluene (TNT) by NMR to determine 13C and 15N intramolecular isotopic profiles. Talanta 2020; 213:120819. [PMID: 32200922 DOI: 10.1016/j.talanta.2020.120819] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 02/04/2020] [Accepted: 02/10/2020] [Indexed: 12/30/2022]
Abstract
2,4,6-trinitrotoluene (TNT) is a molecule which is easily identified with current instrumental techniques but it is generally impossible to distinguish between sources of the same substance (TNT). To overcome this difficulty, we present a multi stable isotope approach using isotope ratio monitoring by mass spectrometry (irm-MS) and Nuclear Magnetic Resonance spectrometry (irm-NMR). In the one hand, irm-MS provides bulk isotopic composition at natural abundance in 13C and 15N. The range of variation between samples is rather small particularly for 13C. In the other hand, irm-13C NMR and irm-15N NMR enable the determination of positional intramolecular 13C/12C ratios (δ13Ci) and 15N/14N ratios (δ15Ni) with high precision that lead to larger variation between samples. The present work reports an application of the recent methodology using irm-15N NMR to determine position-specific 15N isotope content of TNT. The interest of this methodology is compared to irm-13C NMR and irm-MS (13C and 15N) in terms of TNT samples discrimination. Thanks to the use of irm-NMR the results show a unique isotopic fingerprint for each TNT which enable origin discrimination between the samples without ambiguity.
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Affiliation(s)
- Valentin Joubert
- Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, University of Nantes, CNRS UMR6230, F-44322, Nantes, France
| | - Virginie Silvestre
- Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, University of Nantes, CNRS UMR6230, F-44322, Nantes, France
| | - Virginie Ladroue
- Institut National de Police Scientifique, Laboratoire de Lyon, 31 avenue Franklin Roosevelt, 69134, Ecully Cedex, France
| | - Fabrice Besacier
- Institut National de Police Scientifique, Laboratoire de Lyon, 31 avenue Franklin Roosevelt, 69134, Ecully Cedex, France
| | - Paule Blondel
- Institut National de Police Scientifique, Laboratoire de Lyon, 31 avenue Franklin Roosevelt, 69134, Ecully Cedex, France
| | - Serge Akoka
- Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, University of Nantes, CNRS UMR6230, F-44322, Nantes, France
| | - Evelyne Baguet
- Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, University of Nantes, CNRS UMR6230, F-44322, Nantes, France
| | - Gérald S Remaud
- Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, University of Nantes, CNRS UMR6230, F-44322, Nantes, France.
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10
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Joubert V, Silvestre V, Lelièvre M, Ladroue V, Besacier F, Akoka S, Remaud GS. Position-specific 15 N isotope analysis in organic molecules: A high-precision 15 N NMR method to determine the intramolecular 15 N isotope composition and fractionation at natural abundance. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:1136-1142. [PMID: 31222922 DOI: 10.1002/mrc.4903] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 06/05/2019] [Accepted: 06/10/2019] [Indexed: 06/09/2023]
Abstract
The position-specific 15 N isotope content in organic molecules, at natural abundance, is for the first time determined by using a quantitative methodology based on 15 N Nuclear Magnetic Resonance (NMR) spectrometry. 15 N NMR spectra are obtained by using an adiabatic "Full-Spectrum" INEPT sequence in order to make possible 15 N NMR experiments with a high signal-to-noise ratio (>500), to reach a precision with a standard deviation below 1‰ (0.1%). This level of precision is required for observing small changes in 15 N content associated to 15 N isotope effects. As an illustration, the measurement of an isotopic enrichment factor ε for each 15 N isotopomer is presented for 1-methylimidazole induced during a separation process on a silica column. The precision expressed as the long-term repeatability of the methodology is good enough to evaluate small changes in the 15 N isotope contents for a given isotopomer. As observed for 13 C, inverse and normal 15 N isotope effects occur concomitantly, giving access to new information on the origin of the 15 N isotope effects, not detectable by other techniques such as isotope ratio measured by Mass Spectrometry for which bulk (average) values are obtained.
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Affiliation(s)
- Valentin Joubert
- EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, Nantes, France
| | | | - Maxime Lelièvre
- EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, Nantes, France
| | - Virginie Ladroue
- Laboratoire de Lyon, Institut National de Police Scientifique, Ecully, France
| | - Fabrice Besacier
- Laboratoire de Lyon, Institut National de Police Scientifique, Ecully, France
| | - Serge Akoka
- EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, Nantes, France
| | - Gérald S Remaud
- EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, Nantes, France
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11
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Chen H, Shen B, Zhang S, Xiang P, Zhuo X, Shen M. Alcohol consumption or contamination: A preliminary study on the determination of the ethanol origin by stable carbon isotope analysis. Forensic Sci Int 2018; 289:374-380. [DOI: 10.1016/j.forsciint.2018.06.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 06/04/2018] [Accepted: 06/10/2018] [Indexed: 11/26/2022]
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12
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Vasquez L, Rostkowski M, Gelman F, Dybala-Defratyka A. Can Path Integral Molecular Dynamics Make a Good Approximation for Vapor Pressure Isotope Effects Prediction for Organic Solvents? A Comparison to ONIOM QM/MM and QM Cluster Calculation. J Phys Chem B 2018; 122:7353-7364. [PMID: 29961315 DOI: 10.1021/acs.jpcb.8b03444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Isotopic fractionation of volatile organic compounds (VOCs), which are under strict measures of control because of their potential harm to the environment and humans, has an important ecological aspect, as the isotopic composition of compounds may depend on the conditions in which such compounds are distributed in Nature. Therefore, detailed knowledge on isotopic fractionation, not only experimental but also based on theoretical models, is crucial to follow conditions and pathways within which these contaminants are spread throughout the ecosystems. In this work, we present carbon and, for the first time, bromine vapor pressure isotope effect (VPIE) on the evaporation process from pure-phase systems-dibromomethane and bromobenzene, the representatives of aliphatic and aromatic brominated VOCs. We combine isotope effects measurements with their theoretical prediction using three computational techniques, namely path integral molecular dynamics, QM cluster, and hybrid ONIOM models. While evaporation of both compounds resulted in normal bromine VPIEs, the difference in the direction of carbon isotopic fractionation is observed for the aliphatic and aromatic compounds, where VPIEs are inverse and normal, respectively. Even though theoretical models tested here turned out to be insufficient for quantitative agreement with the experimental values, cluster electronic structure calculations, as well as two-layer ONIOM computations, provided better reproduction of experimental trends.
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Affiliation(s)
- Luis Vasquez
- Institute of Applied Radiation Chemistry, Faculty of Chemistry , Lodz University of Technology , Żeromskiego 116 , 90-924 Łódź , Poland
| | - Michal Rostkowski
- Institute of Applied Radiation Chemistry, Faculty of Chemistry , Lodz University of Technology , Żeromskiego 116 , 90-924 Łódź , Poland
| | - Faina Gelman
- Geological Survey of Israel , Malkhei Israel Street 30 , 95501 Jerusalem , Israel
| | - Agnieszka Dybala-Defratyka
- Institute of Applied Radiation Chemistry, Faculty of Chemistry , Lodz University of Technology , Żeromskiego 116 , 90-924 Łódź , Poland
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