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Stutzman JR, Hutchins PD, Bain RM. Online Bipolar Dual Spray for the Charge State Reduction and Characterization of Complex Synthetic Polymers. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:2840-2848. [PMID: 38053368 DOI: 10.1021/jasms.3c00333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Charge reduction mass spectrometry (CR/MS) hyphenated to liquid chromatography (LC) couples liquid-phase compound separation and mass spectral decompression to resolve and characterize multicomponent systems. LC/CR/MS has proven to be effective for complex mixture analysis, particularly synthetic polymers. A newer charge manipulation approach called bipolar dual spray has previously been demonstrated to reduce the observed charge state distribution of ammoniated polyethene glycol. In this approach, two electrospray emitters, in close proximity and of opposite polarity, fuse droplets from their electrospray plumes, which allows the subsequent chemistry. In this work, we investigate the ability of bipolar dual spray to reduce the charge of synthetic polyols, thereby simplifying complex mixture analysis and generating new compositional information only available through the coupling of charge reduction with LC/MS analysis. This work also represents the first demonstration of online charge reduction via dual spray. Polyethylene glycol (PEG) 7.2K subjected to LC/MS with dual spray reduced the average charge state from 8.2+ to 4.4+. LC/MS with dual spray was also applied to the characterization of an end-group-modified PEG 10K (i.e., aminated) containing several reaction impurities. This approach allowed for the identification of low-level starting material, tosylated PEG, and PEG mono(amine), where both LC/MS and direct infusion dual spray did not detect the impurities. Overall, the results demonstrated that bipolar dual spray can be incorporated into an LC/MS analysis and affords the ability to reduce the charge state distribution of PEG cations, decompress the m/z axis, lower spectra complexity, and enable/simplify data interpretation.
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Affiliation(s)
- John R Stutzman
- Analytical Sciences, Dow Inc., Midland, Michigan 48640, United States
| | - Paul D Hutchins
- Analytical Sciences, Dow Inc., Midland, Michigan 48640, United States
| | - Ryan M Bain
- Analytical Sciences, Dow Inc., Midland, Michigan 48640, United States
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Abstract
Native mass spectrometry (MS) is aimed at preserving and determining the native structure, composition, and stoichiometry of biomolecules and their complexes from solution after they are transferred into the gas phase. Major improvements in native MS instrumentation and experimental methods over the past few decades have led to a concomitant increase in the complexity and heterogeneity of samples that can be analyzed, including protein-ligand complexes, protein complexes with multiple coexisting stoichiometries, and membrane protein-lipid assemblies. Heterogeneous features of these biomolecular samples can be important for understanding structure and function. However, sample heterogeneity can make assignment of ion mass, charge, composition, and structure very challenging due to the overlap of tens or even hundreds of peaks in the mass spectrum. In this review, we cover data analysis, experimental, and instrumental advances and strategies aimed at solving this problem, with an in-depth discussion of theoretical and practical aspects of the use of available deconvolution algorithms and tools. We also reflect upon current challenges and provide a view of the future of this exciting field.
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Affiliation(s)
- Amber D. Rolland
- Department of Chemistry and Biochemistry, 1253 University of Oregon, Eugene, OR, USA 97403-1253
| | - James S. Prell
- Department of Chemistry and Biochemistry, 1253 University of Oregon, Eugene, OR, USA 97403-1253
- Materials Science Institute, 1252 University of Oregon, Eugene, OR, USA 97403-1252
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Brodbelt JS, Morrison LJ, Santos I. Ultraviolet Photodissociation Mass Spectrometry for Analysis of Biological Molecules. Chem Rev 2020; 120:3328-3380. [PMID: 31851501 PMCID: PMC7145764 DOI: 10.1021/acs.chemrev.9b00440] [Citation(s) in RCA: 139] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The development of new ion-activation/dissociation methods continues to be one of the most active areas of mass spectrometry owing to the broad applications of tandem mass spectrometry in the identification and structural characterization of molecules. This Review will showcase the impact of ultraviolet photodissociation (UVPD) as a frontier strategy for generating informative fragmentation patterns of ions, especially for biological molecules whose complicated structures, subtle modifications, and large sizes often impede molecular characterization. UVPD energizes ions via absorption of high-energy photons, which allows access to new dissociation pathways relative to more conventional ion-activation methods. Applications of UVPD for the analysis of peptides, proteins, lipids, and other classes of biologically relevant molecules are emphasized in this Review.
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Affiliation(s)
- Jennifer S. Brodbelt
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Lindsay J. Morrison
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Inês Santos
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
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Foreman DJ, McLuckey SA. Recent Developments in Gas-Phase Ion/Ion Reactions for Analytical Mass Spectrometry. Anal Chem 2020; 92:252-266. [PMID: 31693342 PMCID: PMC6949396 DOI: 10.1021/acs.analchem.9b05014] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- David J Foreman
- Department of Chemistry , Purdue University , West Lafayette , Indiana 47907-2084 , United States
| | - Scott A McLuckey
- Department of Chemistry , Purdue University , West Lafayette , Indiana 47907-2084 , United States
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Stutzman JR, Bain RM, Hagenhoff S, Woodward WH, O'Brien JP, Lesniak M. Microdroplet Fusion Chemistry for Charge State Reduction of Synthetic Polymers via Bipolar Dual Spray with Anionic Reagents. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1742-1749. [PMID: 31140078 DOI: 10.1007/s13361-019-02236-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 04/15/2019] [Accepted: 04/18/2019] [Indexed: 06/09/2023]
Abstract
Microdroplet fusion chemistry is an emerging area of analyte manipulation that utilizes the ion source region of a mass spectrometer to covalently derivatize or manipulate the charge state distribution. This technique utilizes two electrospray emitters in close proximity, where the droplets from each electrospray plume fuse and undergo the subsequent chemistry. In this study, microdroplet fusion chemistry via bipolar dual spray has demonstrated the ability to reduce the average charge state of polyethylene glycol (PEG) cations using anionic reagents. Bipolar dual spray was implemented on a commercial mass spectrometer with limited hardware modifications to the ion source. Reagents including ammonium hydroxide, formic acid, and lithium chloride showed dramatic shifts in the average charge state of PEG 3.8 K cations (e.g., 5.0+ to 2.5+) along with the emergence of newly detected charge states. An organic base, tributylamine, had no effect on the charge state distribution of PEG 3.8 K cations. These results were consistent with an ion-pairing mechanism, where reagent anions destabilized ammonium cation interactions with PEG 3.8 K upon droplet fusion from the negative and positive emitters. Additional bipolar dual spray experiments with PEG 12.6 K demonstrated the ability to transform uninterpretable mass information into distinct charge states ranging from [M+8NH4]+ to [M+3NH4]+. Overall, this study provides insight into the nature of dual spray chemistry and will aid future experimental design in microdroplet covalent chemistry.
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Affiliation(s)
- John R Stutzman
- Analytical Sciences, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA.
| | - Ryan M Bain
- Analytical Sciences, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA
| | - Sebastian Hagenhoff
- Analytical Sciences, Dow Deutschland Anlagengesellschaft mbH, 21677, Stade, Germany
| | - William H Woodward
- Analytical Sciences, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA
| | - John P O'Brien
- Plastics Characterization, The Dow Chemical Company, Lake Jackson, TX, 77566, USA
| | - Michael Lesniak
- Analytical Sciences, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA
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Wang N, Pilo AL, Zhao F, Bu J, McLuckey SA. Gas-phase rearrangement reaction of Schiff-base-modified peptide ions. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:2166-2173. [PMID: 30280440 PMCID: PMC6657513 DOI: 10.1002/rcm.8298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 09/18/2018] [Accepted: 09/26/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Schiff base modification of peptides has been shown to facilitate their primary structural characterization via tandem mass spectrometry. However, we have discovered a novel rearrangement reaction via ion trap collisional activation involving the imine of the Schiff base and one of several functional groups, particularly the side chains of the basic residues lysine, arginine, and histidine, in the peptide. METHODS Gas-phase ion/ion reactions involving an aldehyde-containing reagent were used to generate Schiff-base-modified model peptides in a hybrid triple quadrupole/linear ion trap tandem mass spectrometer. Subsequent ion trap collisional activation was used to study the rearrangement reaction. RESULTS Schiff-base-modified peptide ions were found to undergo a rearrangement reaction that was observed to be either a major or minor contributor to the product ion spectrum, depending upon a variety of factors that include, for example, ion polarity, identity of the nucleophile in the peptide (e.g., side chains of lysine, histidine, and arginine), and the position of the nucleophile relative to the imine. CONCLUSIONS Relatively low-energy rearrangement reactions can occur in Schiff-base-modified peptide ions that involve the imine of the Schiff base and a nucleophile present in the polypeptide. While this rearrangement process does not appear to compromise the structural information that can be generated via collisional activation of Schiff-base-modified peptide ions, it can siphon away signal from the structurally diagnostic processes in some instances.
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Affiliation(s)
| | | | | | | | - Scott A. McLuckey
- Address reprint requested to: Dr. S. A. McLuckey, 560 Oval Drive, Department of Chemistry, Purdue University, West Lafayette, IN 47907-2084, USA, Phone: (765) 494-5270, Fax: (765) 494-0239,
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Ramakers G, D'Incal C, Gagliardi M, Molin DGM, Junkers T. Synthesis of Functional Polymer Particles from Morita-Baylis-Hillman Polymerization. Macromol Rapid Commun 2018; 39:e1800678. [PMID: 30387221 DOI: 10.1002/marc.201800678] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/07/2018] [Indexed: 12/27/2022]
Abstract
Functional synthetic polymers are frequently explored for their use in the biomedical field. To fulfill the stringent demands of biodegradability and compatibility, the materials need to be versatile and tunable. Post-modification is often considered challenging for well-known degradable materials like poly(lactic acid) because of their chemical inertness. In this work a procedure is proposed to produce densely functionalized polymer particles using oligomeric precursors synthesized via the Morita-Baylis-Hillman reaction. This allows for a variety of post-modification reactions to serve bio-conjugation or tuning of the material properties. The particles are subjected to basic media and found to be degradable. Furthermore, cytotoxicity tests confirm good biocompatibility. Finally, as a proof of concept to demonstrate the versatility of the particles, post-modification reactions are carried out through the formation of imines.
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Affiliation(s)
- Gijs Ramakers
- Polymer Reaction Design group, Institute for Materials Research, Universiteit Hasselt, Martelarenlaan 42, B-3500, Hasselt, Belgium
| | - Claudio D'Incal
- Polymer Reaction Design group, Institute for Materials Research, Universiteit Hasselt, Martelarenlaan 42, B-3500, Hasselt, Belgium
| | - Mick Gagliardi
- Department of Physiology, Maastricht University, PO Box 616, 6200, MD, Maastricht, The Netherlands
| | - Daniël G M Molin
- Department of Physiology, Maastricht University, PO Box 616, 6200, MD, Maastricht, The Netherlands
| | - Tanja Junkers
- Polymer Reaction Design group, Institute for Materials Research, Universiteit Hasselt, Martelarenlaan 42, B-3500, Hasselt, Belgium.,Polymer Reaction Design group, School of Chemistry, Monash University, 19 Rainforest Walk, Clayton, VIC 3800, Australia
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Sundberg BN, Lagalante AF. Coaxial Electrospray Ionization for the Study of Rapid In-source Chemistry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:2023-2029. [PMID: 29949060 DOI: 10.1007/s13361-018-2004-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 05/25/2018] [Accepted: 05/31/2018] [Indexed: 06/08/2023]
Abstract
Coaxial electrospray has been used effectively for several dual-emitter applications, but has not been utilized for the study of rapid in-source chemistry. In this paper, we report the fabrication of a coaxial, micro-volume dual-emitter through the modification of a manufacturer's standard electrospray probe. This modification creates rapid mixing inside the Taylor cone and the ability to manipulate fast reactions using a variety of solvents and analytes. We demonstrate its potential as a low-cost, dual-emitter assembly for diverse applications through three examples: relative ionization in a biphasic electrospray, hydrogen-deuterium exchange, and protein supercharging. Graphical Abstract.
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Affiliation(s)
- Brynn N Sundberg
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, PA, 19085, USA
| | - Anthony F Lagalante
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, PA, 19085, USA.
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Affiliation(s)
- Nicholas
M. Riley
- Department
of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Genome
Center of Wisconsin, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Joshua J. Coon
- Department
of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Genome
Center of Wisconsin, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Department
of Biomolecular Chemistry, University of
Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Morgridge
Institute for Research, Madison, Wisconsin 53715, United States
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Pilo AL, Bu J, McLuckey SA. Gas-Phase Oxidation of Neutral Basic Residues in Polypeptide Cations by Periodate. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1979-1988. [PMID: 27644939 PMCID: PMC5088057 DOI: 10.1007/s13361-016-1491-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 08/19/2016] [Accepted: 08/23/2016] [Indexed: 06/06/2023]
Abstract
The gas-phase oxidation of doubly protonated peptides containing neutral basic residues to various products, including [M + H + O]+, [M - H]+, and [M - H - NH3]+, is demonstrated here via ion/ion reactions with periodate. It was previously demonstrated that periodate anions are capable of oxidizing disulfide bonds and methionine, tryptophan, and S-alkyl cysteine residues. However, in the absence of these easily oxidized sites, we show here that systems containing neutral basic residues can undergo oxidation. Furthermore, we show that these neutral basic residues primarily undergo different types of oxidation (e.g., hydrogen abstraction) reactions than those observed previously (i.e., oxygen transfer to yield the [M + H + O]+ species) upon gas-phase ion/ion reactions with periodate anions. This chemistry is illustrated with a variety of systems, including a series of model peptides, a cell-penetrating peptide containing a large number of unprotonated basic sites, and ubiquitin, a roughly 8.6 kDa protein. Graphical Abstract ᅟ.
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Affiliation(s)
- Alice L Pilo
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907-2084, USA
| | - Jiexun Bu
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907-2084, USA
| | - Scott A McLuckey
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907-2084, USA.
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Cotham VC, McGee WM, Brodbelt JS. Modulation of Phosphopeptide Fragmentation via Dual Spray Ion/Ion Reactions Using a Sulfonate-Incorporating Reagent. Anal Chem 2016; 88:8158-65. [PMID: 27467576 DOI: 10.1021/acs.analchem.6b01901] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The labile nature of phosphoryl groups has presented a long-standing challenge for the characterization of protein phosphorylation via conventional mass spectrometry-based bottom-up proteomics methods. Collision-induced dissociation (CID) causes preferential cleavage of the phospho-ester bond of peptides, particularly under conditions of low proton mobility, and results in the suppression of sequence-informative fragmentation that often prohibits phosphosite determination. In the present study, the fragmentation patterns of phosphopeptides are improved through ion/ion-mediated peptide derivatization with 4-formyl-1,3-benezenedisulfonic acid (FBDSA) anions using a dual spray reactor. This approach exploits the strong electrostatic interactions between the sulfonate moieties of FBDSA and basic sites to facilitate gas-phase bioconjugation and to reduce charge sequestration and increase the yield of phosphate-retaining sequence ions upon CID. Moreover, comparative CID fragmentation analysis between unmodified phosphopeptides and those modified online with FBDSA or in solution via carbamylation and 4-sulfophenyl isothiocyanate (SPITC) provided evidence for sulfonate interference with charge-directed mechanisms that result in preferential phosphate elimination. Our results indicate the prominence of charge-directed neighboring group participation reactions involved in phosphate neutral loss, and the implementation of ion/ion reactions in a dual spray reactor setup provides a means to disrupt the interactions by competing hydrogen-bonding interactions between sulfonate groups and the side chains of basic residues.
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Affiliation(s)
- Victoria C Cotham
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - William M McGee
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Jennifer S Brodbelt
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
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Rashid S, Overton S, Mazigh B, Mayer PM. Dual-spray hydrogen/deuterium exchange (HDX) reactions: A new method of probing protein structure. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1505-1512. [PMID: 27321838 DOI: 10.1002/rcm.7591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/13/2016] [Accepted: 04/18/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE Traditionally, hydrogen/deuterium exchange (HDX) reactions are done in the solution phase. This usually involves incubating the protein with a suitable deuterating agent then acidifying the solution to quench the reaction. A more efficient method may be to conduct the reaction within the ion source of a mass spectrometer and subsequently analyze the products. METHODS Using the two electrospray emitters equipped on the Waters Synapt G1 mass spectrometer, HDX reactions were conducted within the ion source region in a controlled fashion ('dual-spray'). Peptide and protein solutions were electrosprayed through one emitter and the deuterating agent D2 O through the secondary electrospray emitter. For the relatively small peptides, Phe-Leu-Glu-Glu-Leu and oxytocin, the yield of products was calculated using deconvolution functions. Electrospray ionization (ESI) charge-state distributions and average number of deuterium exchanges were used to probe secondary and tertiary structures of ubiquitin, lysozyme, and cytochrome c in their native and unfolded states. RESULTS Clear shifts in isotope distributions indicated HDX occurring within the ion source. By ion mobility, simultaneous deuterium exchange for two isobaric species, the oxytocin monomer and dimer, was observed. For denatured ubiquitin, the 12+ and 13+ charge states have a lower average number of exchanges relative to the lower charge states which indicates that these charge states have segments which restrict the access of D2 O. Lysozyme has a linear relationship between the charge state and the average number of exchanges, indicating that lysozyme becomes increasingly unfolded as the charge state increases. The dual-spray HDX method was paired to high-performance liquid chromatography (HPLC) to demonstrate the applicability of the technique for probing gas-phase structures in protein mixtures. CONCLUSIONS ESI droplets formed from a secondary emitter penetrate primary ESI droplets and change the solvent composition. Dual-spray HDX is demonstrated to be a more efficient method for probing the structure of proteins than solution-phase HDX since the acid quenching step can be surpassed. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Shaan Rashid
- Chemistry Department, University of Ottawa, 10 Marie Curie, Ottawa, ON, Canada, K1N 6N5
| | - Sean Overton
- Chemistry Department, University of Ottawa, 10 Marie Curie, Ottawa, ON, Canada, K1N 6N5
| | - Bihac Mazigh
- Chemistry Department, University of Ottawa, 10 Marie Curie, Ottawa, ON, Canada, K1N 6N5
| | - Paul M Mayer
- Chemistry Department, University of Ottawa, 10 Marie Curie, Ottawa, ON, Canada, K1N 6N5
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