1
|
Mika J, Barek J, Zima J, Prokešová E, Dejmkova H. Comparison of Glassy Carbon and Copper Microparticles as a Renewable Working Electrode Material for Amperometric Determination of Amino Acids Using Flow Through Detector. ELECTROANAL 2019. [DOI: 10.1002/elan.201800650] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jan Mika
- Charles University, Faculty of Science, Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Albertov 6 CZ-128 43 Prague 2 Czech Republic
| | - Jiří Barek
- Charles University, Faculty of Science, Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Albertov 6 CZ-128 43 Prague 2 Czech Republic
| | - Jiří Zima
- Charles University, Faculty of Science, Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Albertov 6 CZ-128 43 Prague 2 Czech Republic
| | - Edita Prokešová
- Charles University, Faculty of Science, Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Albertov 6 CZ-128 43 Prague 2 Czech Republic
| | - Hana Dejmkova
- Charles University, Faculty of Science, Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Albertov 6 CZ-128 43 Prague 2 Czech Republic
| |
Collapse
|
2
|
Nagy L, Bátai R, Nagy G, Nagy G. Application of Copper Electrode Based Amperometric Detector Cell for LC Analysis of Main Sugar Component of Honey and Nectar. ANAL LETT 2010. [DOI: 10.1080/00032710903518815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
3
|
Heli H, Hajjizadeh M, Jabbari A, Moosavi-Movahedi A. Fine steps of electrocatalytic oxidation and sensitive detection of some amino acids on copper nanoparticles. Anal Biochem 2009; 388:81-90. [DOI: 10.1016/j.ab.2009.02.021] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Revised: 02/08/2009] [Accepted: 02/16/2009] [Indexed: 10/21/2022]
|
4
|
Coutinho CFB, Coutinho LFM, Mazo LH, Nixdorf SL, Camara CAP. Rapid and direct determination of glyphosate and aminomethylphosphonic acid in water using anion-exchange chromatography with coulometric detection. J Chromatogr A 2008; 1208:246-9. [PMID: 18804213 DOI: 10.1016/j.chroma.2008.09.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 08/27/2008] [Accepted: 09/03/2008] [Indexed: 11/30/2022]
Abstract
A simple, rapid, and low-cost coulometric method for direct detection of glyphosate and aminomethylphosphonic acid (AMPA) in water samples using anion-exchange chromatography and coulometric detection with copper electrode is presented. Under optimized conditions, the limits of detection (LODs) (S/N=3) were 0.038microgml(-1) for glyphosate and 0.24microgml(-1) for AMPA, without any preconcentration method. The calibration curves were linear and presented an excellent correlation coefficient. The method was successfully applied to the determination of glyphosate and AMPA in water samples without any kind of extraction, clean-up, or preconcentration step. No interferent was found in the water, like this, the recovery was, practically, 100%.
Collapse
Affiliation(s)
- Cláudia F B Coutinho
- Universidade de São Paulo, Instituto de Química de São Carlos, Av. Trabalhador São-carlense 400, Caixa Postal 780, CEP 13566-590 São Carlos, SP, Brazil
| | | | | | | | | |
Collapse
|
5
|
Coutinho C, Coutinho L, Mazo L, Lanças F. Copper Microelectrode as Liquid Chromatography Detector for Herbicide Glyphosate. ELECTROANAL 2007. [DOI: 10.1002/elan.200603817] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
6
|
Coutinho CFB, Coutinho LFM, Mazo LH, Nixdorf SL, Camara CAP, Lanças FM. Direct determination of glyphosate using hydrophilic interaction chromatography with coulometric detection at copper microelectrode. Anal Chim Acta 2007; 592:30-5. [PMID: 17499067 DOI: 10.1016/j.aca.2007.04.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2006] [Revised: 04/03/2007] [Accepted: 04/04/2007] [Indexed: 11/20/2022]
Abstract
A simple, rapid, and low-cost coulometric method for direct detection of glyphosate using hydrophilic interaction chromatography is presented. The principle of detection is based on the enhancement of the anodic current of copper microelectrode in the presence of complexing agents, such as glyphosate, with the formation of a soluble Cu(II) complex. Under optimized conditions, the limit of detection (S/R=3) for glyphosate was 0.1 mg L(-1) (0.59 microM) without any preconcentration method. The calibration curve has been found linear in all concentration range tested (from limit of detection to 34 mg L(-1)) with an excellent correlation coefficient (0.9999). The present method was successfully applied for the determination of glyphosate in fruit juices without any kind of extraction, clean-up, or preconcentration step, with recoveries of 92 and 90% for apple and grape juice, respectively.
Collapse
Affiliation(s)
- Cláudia F B Coutinho
- Universidade de São Paulo, Instituto de Química de São Carlos, Av. Trabalhador São-carlense 400, Caixa Postal 780, CEP 13566-590 São Carlos, SP, Brazil.
| | | | | | | | | | | |
Collapse
|
7
|
Petritis K, Elfakir C, Dreux M. A comparative study of commercial liquid chromatographic detectors for the analysis of underivatized amino acids. J Chromatogr A 2002; 961:9-21. [PMID: 12186396 DOI: 10.1016/s0021-9673(02)00377-1] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study compares the main commercial detectors that can detect amino acids in their underivatized form. The detectors tested are: the chemiluminescent nitrogen detector (CLND), the evaporative light scattering detector (ELSD), the nuclear magnetic resonance spectrometer, conductivity detector, refractive index, UV, and electrospray quadrupole mass spectrometry (in simple and tandem MS mode). As ELSD, CLND and MS require a volatile mobile phase, an ion-pair reversed-phase liquid chromatographic system was selected, consisting of an octadecyl column and an aqueous mobile phase containing pentadecafluorooctanoic acid as volatile ion-pairing reagent. Underivatized taurine, hypotaurine, aspartic acid, hydroxyproline, asparagine, serine, glycine, glutamine, cysteine, glutamic acid, threonine and alanine were simultaneously analysed with each detector. In order to test the applicability of these detectors to "real world" samples, the amino acid stoichiometry of the tetrapeptide Gly-Gly-Asp-Ala was determined with each detector after acid hydrolysis. The detectors were compared in terms of linearity, limit of detection, advantages and disadvantages as well as special features (capacity to provide structural information, specificity, quantification with single calibration curve, etc.).
Collapse
Affiliation(s)
- Konstantinos Petritis
- Institut de Chimie Organique et Analytique, CNRS UMR-6005, Université d'Orléans, France
| | | | | |
Collapse
|
8
|
|
9
|
Yang WC, Yu AM, Dai YQ, Chen HY. Separation and determination of di- and tricarboxylic acids in fruits by capillary zone electrophoresis with amperometric detection. Anal Chim Acta 2000. [DOI: 10.1016/s0003-2670(00)00847-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
10
|
Casella IG, Gatta M, Cataldi TR. Amperometric determination of underivatized amino acids at a nickel-modified gold electrode by anion-exchange chromatography. J Chromatogr A 2000; 878:57-67. [PMID: 10843545 DOI: 10.1016/s0021-9673(00)00274-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A nickel-based composite electrode obtained by anodic electrodeposition of nickel (III) oxyhydroxide film on the gold electrode substrate was characterized as an amperometric sensor and successfully applied to the determination of underivatised amino acids in flow-through systems. The electrodeposition of nickel oxyhydroxide films was obtained by cycling a gold electrode between 0.0 V and +1.0 V vs. a saturated calomel electrode in a 80 microM Ni2+ solution buffered at pH 10 with NaHCO3/Na2CO3. The resulting Au-Ni composite electrode exhibits good stability in alkaline medium and can be used as an amperometric sensor of underivatised amino acids at a fixed applied potential (+0.55 V vs. Ag/AgCl). The detection limits (S/N=3) for all investigated compounds ranged between 5 and 30 pmol injected, while the linear ranges spanned over two or three orders of magnitude. The contents of several free amino acids in two sample cheeses from different brands were evaluated by calibration graphs.
Collapse
Affiliation(s)
- I G Casella
- Dipartimento di Chimica, Università degli Studi della Basilicata, Potenza, Italy.
| | | | | |
Collapse
|
11
|
Yang WC, Dai YQ, Yu AM, Chen HY. Simultaneous determination of polycarboxylic acids by capillary electrophoresis with a copper electrode. J Chromatogr A 2000; 867:261-9. [PMID: 10670726 DOI: 10.1016/s0021-9673(99)01083-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The simultaneous determination of polycarboxylic acids including oxalic acid, citric acid, malonic acid, malic acid, tartaric acid, aspartic acid and glutamic acid was achieved by capillary electrophoresis with a copper disk electrode (d = 200 microm). In the system. 0.2 mmol/l cetylpridinium bromide (CPB) was used as an electroosmotic flow (EOF) modifier to reverse the direction of EOF. The effects of the solution pH and CPB concentration on separation were evaluated to achieve the optimum separation conditions. At the working potential of +0.14 V (vs. saturated calomel electrode), the calibration curves for all polycarboxylic acids studied were linear with 2 approximately 3-orders of magnitude and all the detection limits (S/N = 3) were below 15 fmol except malonic acid. Furthermore, the oxalic and citric acids in urine were successfully separated and determined with high sensitivity.
Collapse
Affiliation(s)
- W C Yang
- Department of Chemistry, State Key Laboratory of Coordination Chemistry, Nanjing University, China
| | | | | | | |
Collapse
|
12
|
Zhou J, Lunte SM. Direct determination of amino acids by capillary electrophoresis/electrochemistry using a copper microelectrode and zwitterionic buffers. Electrophoresis 1995; 16:498-503. [PMID: 7588517 DOI: 10.1002/elps.1150160182] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Sixteen free amino acids were separated by capillary electrophoresis (CE) using zwitterionic buffers of pH 9.8 and detected amperometrically using a copper microelectrode. Low conductivity buffers make possible the use of higher buffer concentrations. This depresses the electroosmotic flow, leading to a better separation of the amino acids compared to that obtained using strong electrolytes. The use of zwitterionic buffers also minimizes the amount of Joule heating in the capillary leading to more efficient separations. Perhaps most importantly for electrochemical (EC) detection, these buffers reduce the noise due to high separation current at the EC detector. The increased signal-to-noise ratio (S/N) results in much better detection limits for amino acids than those reported previously for capillary electrophoresis/electrochemistry (CEEC) with a copper electrode. Detection limits ranged from 10 to 400 nM, and the response was linear over three orders of magnitude for most of the amino acids. The system demonstrated good long-term stability and reproducibility with a relative standard deviation (RSD) of less than 5% for both the migration time and peak current (n = 20). This method was employed for the determination of amino acids in urine and in brain microdialysate samples.
Collapse
Affiliation(s)
- J Zhou
- Center for Bioanalytical Research, University of Kansas, Lawrence 66047, USA
| | | |
Collapse
|
13
|
Zhou J, Wang E. Liquid chromatography amperometric detection of catechol, resorcinol, and hydroquinone with a copper-based chemically modified electrode. ELECTROANAL 1992. [DOI: 10.1002/elan.1140040208] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
14
|
Mattusch J, Welsch T, Werner G. Elektrochemischer Detektor mit einer Kohlefaserb�ndel-Arbeitselektrode f�r die HPLC. ACTA ACUST UNITED AC 1992. [DOI: 10.1002/prac.19923340109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
15
|
High-performance liquid chromatography of amino acids and depeptides on new ion exchangers of the HEMA series. J Chromatogr A 1991. [DOI: 10.1016/s0021-9673(01)95959-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
16
|
|
17
|
Ruban VF. Rapid determination of phenylalanine in plasma by capillary high-performance liquid chromatography with electrochemical detection. JOURNAL OF CHROMATOGRAPHY 1991; 563:134-41. [PMID: 2061380 DOI: 10.1016/0378-4347(91)80285-k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- V F Ruban
- Institute of Macromolecular Compounds, U.S.S.R. Academy of Sciences, Leningrad
| |
Collapse
|
18
|
Wang H, Pacáková V, Štulík K. Ion-exchange high-performance liquid chromatographic separation of peptides with UV photometric and electrochemical detection. J Chromatogr A 1990. [DOI: 10.1016/s0021-9673(01)93260-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
19
|
Wang HP, Pacáková V, Stulík K. Determination of ethylenethiourea in beverages without sample pretreatment using high-performance liquid chromatography and amperometric detection on a copper electrode. J Chromatogr A 1988; 457:398-402. [PMID: 3243889 DOI: 10.1016/s0021-9673(01)82091-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- H P Wang
- Department of Analytical Chemistry, Charles University, Prague, Czechoslovakia
| | | | | |
Collapse
|
20
|
Stulík K, Pacáková V, Jokuszies G. Analysis of dipeptides by reversed-phase high-performance liquid chromatography without derivatization using amperometric detection on a copper electrode. J Chromatogr A 1988; 436:334-7. [PMID: 3356766 DOI: 10.1016/s0021-9673(00)94592-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- K Stulík
- Department of Analytical Chemistry, Charles University, Prague, Czechoslovakia
| | | | | |
Collapse
|
21
|
|