1
|
Tonleu Temgoua RC, Kenfack Tonlé I, Boujtita M. Electrochemistry coupled with mass spectrometry for the prediction of the environmental fate and elucidation of the degradation mechanisms of pesticides: current status and future prospects. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:340-350. [PMID: 36661397 DOI: 10.1039/d2em00451h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
One of the crucial steps in the development of a new pesticide (active molecule) is predicting its environmental and in vivo fate, so as to determine potential consequences to a living organism's health and ecology as a whole. In this regard, pesticides undergo transformation processes in response to biotic and abiotic stress. Therefore, there is a need to investigate pesticide transformation products (TPs) and the formation processes they could undergo during the manufacturing process and when discharged into the ecosystem. Although methods based on biological in vitro and in vivo experimental models are tools of choice for the elucidation of metabolic pathways of pesticides (xenobiotics in general), electrochemistry-based techniques offer numerous advantages such as rapid and low-cost analysis, easy implementation, low sample volume requirement, no matrix effects, and miniaturization to improve the performance of the developed methods. However, for greater efficiency, electrochemistry (EC) should be coupled with analytical techniques such as mass spectrometry (MS) and sometimes liquid chromatography (LC), leading to the so-called EC-MS and EC-LC-MS hybrid techniques. In this review, past studies, current applications and utilization of EC-MS and EC-LC-MS techniques for the simulation of environmental fate/degradation of pesticides were reviewed by selected studies with chemical transformation, structures of metabolites, and some experimental conditions. The current challenges and future trends for the mimicry and prediction of the environmental fate/degradation of pesticides based on electrochemical methods combined with mass spectrometry were highlighted.
Collapse
Affiliation(s)
- Ranil Clément Tonleu Temgoua
- Nantes Université, CNRS, CEISAM UMR 6230, F-44000 Nantes, France.
- University of Yaoundé I, Higher Teacher Training College, PO Box 47, Yaoundé, Cameroon
- University of Dschang, Electrochemistry and Chemistry of Materials, Department of Chemistry, Dschang, Cameroon
| | - Ignas Kenfack Tonlé
- University of Dschang, Electrochemistry and Chemistry of Materials, Department of Chemistry, Dschang, Cameroon
| | | |
Collapse
|
2
|
Korzhenko O, Führer P, Göldner V, Olthuis W, Odijk M, Karst U. Microfluidic Electrochemistry Meets Trapped Ion Mobility Spectrometry and High-Resolution Mass Spectrometry-In Situ Generation, Separation, and Detection of Isomeric Conjugates of Paracetamol and Ethoxyquin. Anal Chem 2021; 93:12740-12747. [PMID: 34495637 DOI: 10.1021/acs.analchem.1c02791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Over the last 3 decades, electrochemistry (EC) has been successfully applied in phase I and phase II metabolism simulation studies. The electrochemically generated phase I metabolite-like oxidation products can react with selected reagents to form phase II conjugates. During conjugate formation, the generation of isomeric compounds is possible. Such isomeric conjugates are often separated by high-performance liquid chromatography (HPLC). Here, we demonstrate a powerful approach that combines EC with ion mobility spectrometry to separate possible isomeric conjugates. In detail, we present the hyphenation of a microfluidic electrochemical chip with an integrated mixer coupled online to trapped ion mobility spectrometry (TIMS) and time-of-flight high-resolution mass spectrometry (ToF-HRMS), briefly chipEC-TIMS-ToF-HRMS. This novel method achieves results in several minutes, which is much faster than traditional separation approaches like HPLC, and was applied to the drug paracetamol and the controversial feed preservative ethoxyquin. The analytes were oxidized in situ in the electrochemical microfluidic chip under formation of reactive intermediates and mixed with different thiol-containing reagents to form conjugates. These were analyzed by TIMS-ToF-HRMS to identify possible isomers. It was observed that the oxidation products of both paracetamol and ethoxyquin form two isomeric conjugates, which are characterized by different ion mobilities, with each reagent. Therefore, using this hyphenated technique, it is possible to not only form reactive oxidation products and their conjugates in situ but also separate and detect these isomeric conjugates within only a few minutes.
Collapse
Affiliation(s)
- Oxana Korzhenko
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 28/30, 48149 Münster, Germany
| | - Pascal Führer
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Valentin Göldner
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 28/30, 48149 Münster, Germany.,International Graduate School for Battery Chemistry, Characterization, Analysis, Recycling and Application (BACCARA), University of Münster, Corrensstr. 40, 48149 Münster, Germany
| | - Wouter Olthuis
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Mathieu Odijk
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Uwe Karst
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 28/30, 48149 Münster, Germany.,International Graduate School for Battery Chemistry, Characterization, Analysis, Recycling and Application (BACCARA), University of Münster, Corrensstr. 40, 48149 Münster, Germany
| |
Collapse
|
3
|
Electrochemical Reduction of Azo Dyes Mimicking their Biotransformation to More Toxic Products. J Vet Res 2019; 63:433-438. [PMID: 31572825 PMCID: PMC6749740 DOI: 10.2478/jvetres-2019-0044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 07/02/2019] [Indexed: 01/12/2023] Open
Abstract
Introduction Some azo dyes, including Sudans I–IV and Para Red, are genotoxic and may be biotransformed to cancerogenic aromatic amines. They are banned as food and feed additives, but their presence has been detected in food. Aromatic amines are also considered potentially toxic. Online EC–MS is a promising tool to study the transformation mechanisms of xenobiotics such as azo dyes. The aim of the study was to investigate emulation of how azo dyes are enzymatically transformed to amines with EC–MS. Material and Methods The reduction reactions of five azo dyes (Sudans I–IV and Para Red) were conducted using a glassy carbon working electrode and 0.1% formic acid in acetonitrile. Reduction results were compared with the literature and in silico to select preliminary candidates for metabolites. The LC-MS/MS method was used to confirm results obtained by electrochemical reactor. Results A limited number of pre-selected compounds were confirmed as azo dyes metabolites – aniline for Sudan I, aniline and 4-aminoazobenzene for Sudan III, o-toluidine for Sudan IV, and 4-nitroaniline for Para Red. No metabolites were found for Sudan II. Conclusions Electrochemistry–mass spectrometry was successfully applied to azo dyes. This approach may be used to mimic the metabolism of azo dyes, and therefore predict products of biotransformation.
Collapse
|
4
|
Duan F, Xu W, Liu J, Jia Z, Chen K, Chen Y, Wang M, Ma K, Dong J, Chen L, Xiao H. Preparing the key metabolite of Z-ligustilide in vivo by a specific electrochemical reaction. J Sep Sci 2018; 41:2799-2807. [PMID: 29663726 DOI: 10.1002/jssc.201800164] [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: 02/10/2018] [Revised: 04/03/2018] [Accepted: 04/07/2018] [Indexed: 11/09/2022]
Abstract
The key in vivo metabolites of a drug play an important role in its efficacy and toxicity. However, due to the low content and instability of these metabolites, they are hard to obtain through in vivo methods. Electrochemical reactions can be an efficient alternative to biotransformation in vivo for the preparation of metabolites. Accordingly, in this study, the metabolism of Z-ligustilide was investigated in vitro by electrochemistry coupled online to mass spectrometry. This work showed that five oxidation products of the electrochemical reaction were detected and that two of the oxidation products (senkyunolide I and senkyunolide H) were identified from liver microsomal incubation as well. Furthermore, after intragastric administration of Z-ligustilide in rats, senkyunolide I and senkyunolide H were detected in the rat plasma and liver, while 6,7-epoxyligustilide, a key intermediate metabolite of Z-ligustilide, was difficult to detect in vivo. By contrast, 6,7-epoxyligustilide was obtained from the electrochemical reaction. In addition, for the first time, 6 mg of 6,7-epoxyligustilide was prepared from 120 mg of Z-ligustilide. Therefore, electrochemical reactions represent an efficient laboratory method for preparing key drug metabolites.
Collapse
Affiliation(s)
- Feipeng Duan
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Wenjuan Xu
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Jie Liu
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Zhixin Jia
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Kuikui Chen
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Yijun Chen
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Mingxia Wang
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Kaiyue Ma
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Jiaojiao Dong
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Lianming Chen
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China
| | - Hongbin Xiao
- Research Center for Chinese Medicine Analysis and Transformation, Beijing University of Chinese Medicine, Beijing, China.,School of Pharmacy, Shihezi University, Shihezi, China
| |
Collapse
|
5
|
Zhu L, Shao Y, Xiao H, Santiago-Schübel B, Meyer-Alert H, Schiwy S, Yin D, Hollert H, Küppers S. Electrochemical simulation of triclosan metabolism and toxicological evaluation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 622-623:1193-1201. [PMID: 29890587 DOI: 10.1016/j.scitotenv.2017.11.317] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/26/2017] [Accepted: 11/27/2017] [Indexed: 06/08/2023]
Abstract
Tricolsan (TCS), an antimicrobial agent, is considered as emerging pollutant due to its wide dispersive use in personal care products and high aquatic toxicity. In the present study, phase I metabolism of triclosan was investigated through laboratory electrochemical simulation studies. The products formed in the electrochemical (EC) cell were identified by online and offline coupling with QTRAP and high-resolution FTICR mass spectrometers, respectively. The sequential formation and disappearance of each product, with the continuous increase of voltage from 0 to 3500 mV, was observed to reveal the transformation pathways of TCS. The toxic potential of TCS and the identified products was estimated using Quantitative structure-activity relationship (QSAR) modeling on 16 target proteins. The toxicity change of TCS during simulated metabolism and toxicological effects of reaction mixture were assessed by Fish embryo toxicity (FET) test (Danio rerio) and quantitative real-time polymerase chain reaction (qPCR). Eight metabolites formed during the simulated metabolism of TCS mainly via the mechanisms of hydroxylation, ether-bond cleavage and cyclization. In FET test, the reaction mixture (LC50, 48h=1.28 mg/L) after electrochemical reactions showed high acute toxicity on zebrafish embryos, which was comparable to that of triclosan (LC50, 48h=1.34 mg/L). According to the modeling data, less toxic products formed only via ether-bond cleavage of TCS while the products formed through other mechanisms showed high toxicity. AhR-mediated dioxin-like effects on zebrafish embryos, such as developmental retardation in skeleyton and malformations in cardiovascular system, were also observed after exposure to the TCS reaction mixture in FET test. Activation of the AhR by the reaction mixture in zebrafish embryos was further proved in cyp1a gene expression analysis.
Collapse
Affiliation(s)
- Linyan Zhu
- Research Center Jülich, Department of Analytics (ZEA-3), Jülich 52425, Germany; RWTH -Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany.
| | - Ying Shao
- RWTH -Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany
| | - Hongxia Xiao
- RWTH -Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany
| | | | - Henriette Meyer-Alert
- RWTH -Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany
| | - Sabrina Schiwy
- RWTH -Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany
| | - Daqiang Yin
- Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China
| | - Henner Hollert
- RWTH -Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany; College of Resources and Environmental Science, Chongqing University, Tiansheng Road Beibei 1, Chongqing 400030, People's Republic of China; Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Xianlin Avenue 163, Nanjing 210046, People's Republic of China
| | - Stephan Küppers
- Research Center Jülich, Department of Analytics (ZEA-3), Jülich 52425, Germany
| |
Collapse
|
6
|
Zhu L, Santiago-Schübel B, Xiao H, Hollert H, Kueppers S. Electrochemical oxidation of fluoroquinolone antibiotics: Mechanism, residual antibacterial activity and toxicity change. WATER RESEARCH 2016; 102:52-62. [PMID: 27318447 DOI: 10.1016/j.watres.2016.06.005] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 05/04/2016] [Accepted: 06/02/2016] [Indexed: 06/06/2023]
Abstract
In this paper, we studied the electrochemical oxidation mechanisms of three typical fluoroquinolone antibiotics (FQs), and investigated residual antibacterial activity and toxicity changes after oxidation processes. Electrochemistry coupled to mass spectrometry (EC-MS) was used to study the oxidation processes of ciprofloxacin (CIP), norfloxacin (NOR) and ofloxacin (OFL). Eight oxidation products for each parent compound were identified and their chemical structures were elucidated. The transformation trend of each product, with the continuous increase of voltage from 0 to 3000 mV, was recorded by online EC-MS. The oxidation pathways were proposed based on the structural information and transformation trends of oxidation products. We found the oxidation mechanisms of FQs consisted of the hydroxylation and cleavage of piperazinyl ring via reactions with hydroxyl radicals, while the fluoroquinolone core remained intact. The antibacterial activity of the parent compounds and their oxidation mixtures was estimated using zone inhibition tests for gram-negative bacteria Salmonella typhimurium. It was found that the oxidation mixtures of CIP and NOR retained the antibacterial properties with lower activity compared to their parent compounds, while the antibacterial activity of OFL was almost eliminated after oxidation. Furthermore, the toxicity of the three FQs and their oxidation mixtures were evaluated using algal growth inhibition test (Desmodesmus subspicatus). The median effective concentration (EC50) values for the algal inhibition tests were calculated for the end point of growth rate. The toxicity of CIP and NOR to green algae after electrochemical oxidation, remained unchanged, while that of OFL significantly increased. The results presented in this paper contribute to an understanding of the electrochemical oxidation mechanisms of FQs, and highlight the potential environmental risks of FQs after electrochemical oxidation processes.
Collapse
Affiliation(s)
- Linyan Zhu
- Research Center Jülich, ZEA-3, Jülich 52425, Germany; Department of Ecosystem Analysis, Institute for Environmental Research, ABBt- Aachen Biology and Biotechnology, RWTH Aachen University, Aachen 52074, Germany
| | | | - Hongxia Xiao
- Department of Ecosystem Analysis, Institute for Environmental Research, ABBt- Aachen Biology and Biotechnology, RWTH Aachen University, Aachen 52074, Germany
| | - Henner Hollert
- Department of Ecosystem Analysis, Institute for Environmental Research, ABBt- Aachen Biology and Biotechnology, RWTH Aachen University, Aachen 52074, Germany; College of Resources and Environmental Science, Chongqing University, 1 Tiansheng Road Beibei, Chongqing 400715, People's Republic of China; Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Xianlin Avenue 163, Nanjing 210046, People's Republic of China
| | | |
Collapse
|
7
|
Zhu L, Santiago-Schübel B, Xiao H, Thiele B, Zhu Z, Qiu Y, Hollert H, Küppers S. An efficient laboratory workflow for environmental risk assessment of organic chemicals. CHEMOSPHERE 2015; 131:34-40. [PMID: 25765261 DOI: 10.1016/j.chemosphere.2015.02.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 02/12/2015] [Accepted: 02/14/2015] [Indexed: 06/04/2023]
Abstract
In this study, we demonstrate a fast and efficient workflow to investigate the transformation mechanism of organic chemicals and evaluate the toxicity of their transformation products (TPs) in laboratory scale. The transformation process of organic chemicals was first simulated by electrochemistry coupled online to mass spectrometry (EC-MS). The simulated reactions were scaled up in a batch EC reactor to receive larger amounts of a reaction mixture. The mixture sample was purified and concentrated by solid phase extraction (SPE) for the further ecotoxicological testing. The combined toxicity of the reaction mixture was evaluated in fish egg test (FET) (Danio rerio) compared to the parent compound. The workflow was verified with carbamazepine (CBZ). By using EC-MS seven primary TPs of CBZ were identified; the degradation mechanism was elucidated and confirmed by comparison to literature. The reaction mixture and one primary product (acridine) showed higher ecotoxicity in fish egg assay with 96 h EC50 values of 1.6 and 1.0 mg L(-1) than CBZ with the value of 60.8 mg L(-1). The results highlight the importance of transformation mechanism study and toxicological effect evaluation for organic chemicals brought into the environment since transformation of them may increase the toxicity. The developed process contributes a fast and efficient laboratory method for the risk assessment of organic chemicals and their TPs.
Collapse
Affiliation(s)
- Linyan Zhu
- Research Center Jülich, ZEA-3, Jülich 52425, Germany; RWTH-Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany
| | | | - Hongxia Xiao
- RWTH-Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany
| | - Björn Thiele
- Research Center Jülich, Plant Sciences, Jülich 52425, Germany
| | - Zhiliang Zhu
- Tongji University, Environmental Science and Technology Department, Siping Road 1239, Shanghai 200092, People's Republic of China
| | - Yanling Qiu
- Tongji University, Environmental Science and Technology Department, Siping Road 1239, Shanghai 200092, People's Republic of China
| | - Henner Hollert
- RWTH-Aachen University, Aachen Biology and Biotechnology - ABBt, Institute for Environmental Research, Department of Ecosystem Analysis, Aachen 52074, Germany; State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Xianlin Avenue 163, Nanjing 210046, People's Republic of China; College of Resources and Environmental Science, Chongqing University, Tiansheng Road Beibei 1, Chongqing 400030, People's Republic of China; Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China
| | | |
Collapse
|
8
|
Bussy U, Jurva U, Boisseau R, Andresen-Bergström M, Silvestre V, Galland N, Jacquemin D, Boujtita M. Unexpected benzimidazole ring formation from a quinoneimide species in the presence of ammonium acetate as supporting electrolyte used in the coupling of electrochemistry with mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:456-460. [PMID: 26349468 DOI: 10.1002/rcm.7122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 12/05/2014] [Accepted: 12/11/2014] [Indexed: 06/05/2023]
Abstract
RATIONALE Electrochemistry (EC) coupled to mass spectrometry (MS) has been used to study different phase-I reactions. Despite of the versatility of EC/MS, the effect of the nature of the supporting electrolyte on the formation of oxidation products has seldom been discussed during EC/MS experiments. Here, we present a comparison of two different supporting electrolytes and their effect on the identification of unstable intermediate oxidation species is discussed. METHODS The oxidation of acebutolol was performed with a coulometric cell in the presence of two supporting electrolytes namely ammonium acetate and lithium acetate. Ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC/QTOFMS) using a binary gradient (water/acetonitrile) with positive electrospray ionization was used to identify the oxidation products in the presence and absence of glutathione. Chemical structure elucidations of the oxidation products were performed by high-resolution mass spectrometry (HRMS) and were also supported by nuclear magnetic resonance (NMR) measurements. RESULTS From the electrochemical study and HRMS measurements, we demonstrate that the quinoneimide species resulting from the oxidative hydrolyses of acebutolol gives a benzimidazole ring product in the presence of ammonium acetate. Through the example of the oxidation of acebutolol, a correlation between the supporting electrolyte nature and oxidation product formation was established. The obtained results were supported by quantum mechanical calculations. CONCLUSIONS We present here evidence of the side reactions induced by the presence of ammonia as supporting electrolyte during EC/MS measurements. Acebutolol was used as a model to postulate an uncommon and unexpected side reaction leading to benzimidazole ring formation. The findings may help to understand the identification of the intermediate species in the oxidative degradation process.
Collapse
Affiliation(s)
- Ugo Bussy
- LUNAM Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, BP 92208, F-44322, Nantes Cedex 3, France
| | - Ulrik Jurva
- CVMD iMed DMPK, AstraZeneca R&D Mölndal, Mölndal, Sweden
| | - Renaud Boisseau
- LUNAM Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, BP 92208, F-44322, Nantes Cedex 3, France
| | | | - Virginie Silvestre
- LUNAM Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, BP 92208, F-44322, Nantes Cedex 3, France
| | - Nicolas Galland
- LUNAM Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, BP 92208, F-44322, Nantes Cedex 3, France
| | - Denis Jacquemin
- LUNAM Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, BP 92208, F-44322, Nantes Cedex 3, France
- Institut Universitaire de France, 103, Boulevard Saint-Michel, 75005, Cedex 5, France
| | - Mohammed Boujtita
- LUNAM Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, BP 92208, F-44322, Nantes Cedex 3, France
| |
Collapse
|
9
|
Oberacher H, Pitterl F, Erb R, Plattner S. Mass spectrometric methods for monitoring redox processes in electrochemical cells. MASS SPECTROMETRY REVIEWS 2015; 34:64-92. [PMID: 24338642 PMCID: PMC4286209 DOI: 10.1002/mas.21409] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 07/24/2013] [Accepted: 08/12/2013] [Indexed: 06/03/2023]
Abstract
Electrochemistry (EC) is a mature scientific discipline aimed to study the movement of electrons in an oxidation-reduction reaction. EC covers techniques that use a measurement of potential, charge, or current to determine the concentration or the chemical reactivity of analytes. The electrical signal is directly converted into chemical information. For in-depth characterization of complex electrochemical reactions involving the formation of diverse intermediates, products and byproducts, EC is usually combined with other analytical techniques, and particularly the hyphenation of EC with mass spectrometry (MS) has found broad applicability. The analysis of gases and volatile intermediates and products formed at electrode surfaces is enabled by differential electrochemical mass spectrometry (DEMS). In DEMS an electrochemical cell is sampled with a membrane interface for electron ionization (EI)-MS. The chemical space amenable to EC/MS (i.e., bioorganic molecules including proteins, peptides, nucleic acids, and drugs) was significantly increased by employing electrospray ionization (ESI)-MS. In the simplest setup, the EC of the ESI process is used to analytical advantage. A limitation of this approach is, however, its inability to precisely control the electrochemical potential at the emitter electrode. Thus, particularly for studying mechanistic aspects of electrochemical processes, the hyphenation of discrete electrochemical cells with ESI-MS was found to be more appropriate. The analytical power of EC/ESI-MS can further be increased by integrating liquid chromatography (LC) as an additional dimension of separation. Chromatographic separation was found to be particularly useful to reduce the complexity of the sample submitted either to the EC cell or to ESI-MS. Thus, both EC/LC/ESI-MS and LC/EC/ESI-MS are common.
Collapse
Affiliation(s)
- Herbert Oberacher
- Institute of Legal Medicine and Core Facility Metabolomics, Innsbruck Medical UniversityInnsbruck, Austria
| | - Florian Pitterl
- Institute of Legal Medicine and Core Facility Metabolomics, Innsbruck Medical UniversityInnsbruck, Austria
| | - Robert Erb
- Institute of Legal Medicine and Core Facility Metabolomics, Innsbruck Medical UniversityInnsbruck, Austria
| | - Sabine Plattner
- Institute of Legal Medicine and Core Facility Metabolomics, Innsbruck Medical UniversityInnsbruck, Austria
| |
Collapse
|
10
|
Bussy U, Chung-Davidson YW, Li K, Li W. Phase I and phase II reductive metabolism simulation of nitro aromatic xenobiotics with electrochemistry coupled with high resolution mass spectrometry. Anal Bioanal Chem 2014; 406:7253-60. [PMID: 25234306 DOI: 10.1007/s00216-014-8171-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 09/03/2014] [Accepted: 09/05/2014] [Indexed: 01/25/2023]
Abstract
Electrochemistry combined with (liquid chromatography) high resolution mass spectrometry was used to simulate the general reductive metabolism of three biologically important nitro aromatic molecules: 3-trifluoromethyl-4-nitrophenol (TFM), niclosamide, and nilutamide. TFM is a pesticide used in the Laurential Great Lakes while niclosamide and nilutamide are used in cancer therapy. At first, a flow-through electrochemical cell was directly connected to a high resolution mass spectrometer to evaluate the ability of electrochemistry to produce the main reduction metabolites of nitro aromatic, nitroso, hydroxylamine, and amine functional groups. Electrochemical experiments were then carried out at a constant potential of -2.5 V before analysis of the reduction products by LC-HRMS, which confirmed the presence of the nitroso, hydroxylamine, and amine species as well as dimers. Dimer identification illustrates the reactivity of the nitroso species with amine and hydroxylamine species. To investigate xenobiotic metabolism, the reactivity of nitroso species to biomolecules was also examined. Binding of the nitroso metabolite to glutathione was demonstrated by the observation of adducts by LC-ESI(+)-HRMS and the characteristics of their MSMS fragmentation. In conclusion, electrochemistry produces the main reductive metabolites of nitro aromatics and supports the observation of nitroso reactivity through dimer or glutathione adduct formation.
Collapse
Affiliation(s)
- Ugo Bussy
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI, 48824, USA
| | | | | | | |
Collapse
|
11
|
Kraj A, Brouwer HJ, Reinhoud N, Chervet JP. A novel electrochemical method for efficient reduction of disulfide bonds in peptides and proteins prior to MS detection. Anal Bioanal Chem 2013; 405:9311-20. [PMID: 24077854 PMCID: PMC3826059 DOI: 10.1007/s00216-013-7374-3] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 09/10/2013] [Accepted: 09/13/2013] [Indexed: 01/16/2023]
Abstract
A novel electrochemical (EC) method for fast and efficient reduction of the disulfide bonds in proteins and peptides is presented. The method does not use any chemical agents and is purely instrumental. To demonstrate the performance of the EC reactor cell online with electrospray mass spectrometry, insulin and somatostatin were used as model compounds. Efficient reduction is achieved in continuous infusion mode using an EC reactor cell with a titanium-based working electrode. Under optimized conditions, the presented method shows almost complete reduction of insulin and somatostatin. The method does not require any special sample preparation, and the EC reactor cell makes it suitable for automation. Online EC reduction followed by collision-induced dissociation fragmentation of somatostatin showed more backbone cleavages and improved sequence coverage. By adjusting the settings, the EC reaction efficiency was gradually changed from partial to full disulfide bonds reduction in α-lactalbumin, and the expected shift in charge state distribution has been demonstrated. The reduction can be controlled by adjusting the square-wave pulse, flow rate or mobile phase composition. We have shown the successful use of an EC reactor cell for fast and efficient reduction of disulfide bonds for online mass spectrometry of proteins and peptides. The possibility of online and gradual disulfide bond reduction adds a unique dimension to characterization of disulfide bonds in mid-and top-down proteomics applications.
Collapse
Affiliation(s)
- Agnieszka Kraj
- Antec, Industrieweg 12, 2382NV Zoeterwoude, The Netherlands
| | | | - Nico Reinhoud
- Antec, Industrieweg 12, 2382NV Zoeterwoude, The Netherlands
| | | |
Collapse
|