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Yang X, He L, Xu Z. Pressure-assisted electrokinetic injection for the stacking of biogenic amines gives enhancement factor up to 1000 in CE with UV detection. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:1782-1787. [PMID: 35475508 DOI: 10.1039/d2ay00430e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Pressure-assisted electrokinetic injection (PAEKI) was applied for stacking of positively charged biogenic amines (BAs) to improve the sensitivity of capillary electrophoresis (CE). It is well known that the essential step for PAEKI is finding a stationary state of the running buffer such that the movement of the running buffer due to electroosmotic flow (EOF) is counterbalanced by external pressure in the opposite direction of the EOF under a given electric field. In order to find the balance point systematically and integrally, we studied the velocity of the whole BGE in the capillary by the impetus of opposite direction pressure (-0.1 to -0.6 psi), and the velocity of EOF with different voltages. According to the two sets of linear data, the EOF of CE coupled with PAEKI could be counterbalanced at the opposite direction pressure (-0.1 psi) and voltage (7.8 kV). In this study, the injection time was extended up to 0.35 min for all BAs and 0.70 min for the direct ultraviolet (UV) detection of BAs. Compared with hydrodynamic injection (HDI), the enrichment factors for sample injection times of 0.35 min and 0.70 min were 480-fold and 970-fold, respectively. The limits of detection (LODs) (S/N = 3) of indirect and direct UV detection were respectively 8.7-24.3 nmol L-1 and 0.4-4.5 nmol L-1, which reaches the sensitivity of high-performance liquid chromatography-mass spectrophotometry (HPLC-MS). With appropriate sample dilution, PAEKI can be used in the analysis of BAs in chicken.
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Affiliation(s)
- Xue Yang
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Lili He
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Zhongqi Xu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
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Yang S, Ma S, Zhu K, Wang M, Li J, Arabi M, Liu H, Li Y, Chen L. Simultaneous enrichment/determination of six sulfonamides in animal husbandry products and environmental waters by pressure-assisted electrokinetic injection coupled with capillary zone electrophoresis. J Food Compost Anal 2020. [DOI: 10.1016/j.jfca.2020.103462] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Ferré S, González-Ruiz V, Guillarme D, Rudaz S. Analytical strategies for the determination of amino acids: Past, present and future trends. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1132:121819. [PMID: 31704619 DOI: 10.1016/j.jchromb.2019.121819] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 09/25/2019] [Accepted: 09/27/2019] [Indexed: 12/27/2022]
Abstract
This review describes the analytical methods that have been developed over the years to tackle the high polarity and non-chromophoric nature of amino acids (AAs). First, the historical methods are briefly presented, with a strong focus on the use of derivatization reagents to make AAs detectable with spectroscopic techniques (ultraviolet and fluorescence) and/or sufficiently retained in reversed phase liquid chromatography. Then, an overview of the current analytical strategies for achiral separation of AAs is provided, in which mass spectrometry (MS) becomes the most widely used detection mode in combination with innovative liquid chromatography or capillary electrophoresis conditions to detect AAs at very low concentration in complex matrixes. Finally, some future trends of AA analysis are provided in the last section of the review, including the use of supercritical fluid chromatography (SFC), multidimensional liquid chromatography and electrophoretic separations, hyphenation of ion exchange chromatography to mass spectrometry, and use of ion mobility spectrometry mass spectrometry (IM-MS). Various application examples will also be presented throughout the review to highlight the benefits and limitations of these different analytical approaches for AAs determination.
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Affiliation(s)
- Sabrina Ferré
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland
| | - Víctor González-Ruiz
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland; Swiss Centre for Applied Human Toxicology (SCAHT), Switzerland
| | - Davy Guillarme
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland.
| | - Serge Rudaz
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland; Swiss Centre for Applied Human Toxicology (SCAHT), Switzerland
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Gao F, Chen X, Li X, Li J, Liu H, Chen L. Field-amplified sample injection combined with capillary electrophoresis for the simultaneous determination of five chlorophenols in water samples. Electrophoresis 2019; 40:1771-1778. [PMID: 31090073 DOI: 10.1002/elps.201800532] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 05/11/2019] [Accepted: 05/11/2019] [Indexed: 11/06/2022]
Abstract
A sensitive method of CZE-ultraviolet (UV) detection based on the on-line preconcentration strategy of field-amplified sample injection (FASI) was developed for the simultaneous determination of five kinds of chlorophenols (CPs) namely 4-chlorophenol (4-CP), 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP), and 2,6-dichlorophenol (2,6-DCP) in water samples. Several parameters affecting CZE and FASI conditions were systematically investigated. Under the optimal conditions, sensitivity enhancement factors for 4-CP, 2-CP, 2,4-DCP, 2,4,6-TCP, and 2,6-DCP were 9, 27, 35, 43, and 43 folds, respectively, compared with the direct CZE, and the baseline separation was achieved within 5 min. Then, the developed FASI-CZE-UV method was applied to tap and lake water samples for the five CPs determination. The LODs (S/N = 3) were 0.0018-0.019 µg/mL and 0.0089-0.029 µg/mL in tap water and lake water, respectively. The values of LOQs in tap water (0.006-0.0074 µg/mL) were much lower than the maximum permissible concentrations of 2,4,6-TCP, 2,4-DCP, and 2-CP in drinking water stipulated by World Health Organization (WHO) namely 0.3, 0.04, and 0.01 µg/mL, respectively, and thereby the method was suitable to detect the CPs according to WHO guidelines. Furthermore, the method attained high recoveries in the range of 83.0-119.0% at three spiking levels of five CPs in the two types of water samples, with relative standard deviations of 0.37-8.58%. The developed method was proved to be a simple, sensitive, highly automated, and efficient alternative to CPs determination in real water samples.
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Affiliation(s)
- Fangfang Gao
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, P. R. China.,CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Research Center for Coastal Environmental Engineering and Technology, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Yantai, P. R. China
| | - Xiaoxia Chen
- Hebei Research Centre of Analysis and Testing, Hebei University of Science and Technology, Shijiazhuang, P. R. China
| | - Xiaobin Li
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, P. R. China
| | - Jinhua Li
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Research Center for Coastal Environmental Engineering and Technology, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Yantai, P. R. China
| | - Huitao Liu
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, P. R. China
| | - Lingxin Chen
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Research Center for Coastal Environmental Engineering and Technology, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Yantai, P. R. China
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Jiang Y, He MY, Zhang WJ, Luo P, Guo D, Fang X, Xu W. Recent advances of capillary electrophoresis-mass spectrometry instrumentation and methodology. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2017.05.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Koenka IJ, Hauser PC. Background conductivity independent counter flow preconcentration method for capillary electrophoresis. Electrophoresis 2017; 38:2721-2724. [PMID: 28387958 DOI: 10.1002/elps.201700071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/30/2017] [Accepted: 03/30/2017] [Indexed: 01/18/2023]
Abstract
A preconcentration method for anions is presented, which relies on a trap created by applying an electric field against a hydrodynamic flow of the sample. The trapping zone is created in front of a cation exchange membrane that allows the isolation of the electrode and thus prevents any interference by electrolysis products. Preconcentration factors of up to 20 were demonstrated for nitrate and formate as model analyte ions and were linearly related to the sample volume passed through the trap. A discrimination between the ions was found possible by adjustment of the hydrodynamic flow velocity. The method was also found to be suitable for the preconcentration of an anion (nitrate at 100 μM) in presence of a second anion at a very high concentration (50 mM formate). The detection limits for the four anions chloride, nitrate, perchlorate, and formate could be lowered from 4, 4.3, 4.2, and 7.2 μM obtained without trapping respectively to 127, 142, 139, and 451 nM with trapping.
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Affiliation(s)
| | - Peter C Hauser
- Department of Chemistry, University of Basel, Basel, Switzerland
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Breadmore MC, Wuethrich A, Li F, Phung SC, Kalsoom U, Cabot JM, Tehranirokh M, Shallan AI, Abdul Keyon AS, See HH, Dawod M, Quirino JP. Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2014–2016). Electrophoresis 2016; 38:33-59. [DOI: 10.1002/elps.201600331] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/09/2016] [Accepted: 08/10/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Michael C. Breadmore
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
- ARC Centre of Excellence for Electromaterials Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
- ASTech, ARC Training Centre for Portable Analytical Separation Technologies, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Alain Wuethrich
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Feng Li
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Sui Ching Phung
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Umme Kalsoom
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Joan M. Cabot
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
- ARC Centre of Excellence for Electromaterials Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Masoomeh Tehranirokh
- ASTech, ARC Training Centre for Portable Analytical Separation Technologies, School of Physical Science University of Tasmania Hobart Tasmania Australia
| | - Aliaa I. Shallan
- Department of Analytical Chemistry, Faculty of Pharmacy Helwan University Cairo Egypt
| | - Aemi S. Abdul Keyon
- Department of Chemistry, Faculty of Science Universiti Teknologi Malaysia Johor Bahru Johor Malaysia
| | - Hong Heng See
- Department of Chemistry, Faculty of Science Universiti Teknologi Malaysia Johor Bahru Johor Malaysia
- Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and industrial Research Universiti Teknologi Malaysia Johor Bahru Johor Malaysia
| | - Mohamed Dawod
- Department of Chemistry University of Michigan Ann Arbor MI USA
| | - Joselito P. Quirino
- Australian Centre of Research on Separation Science, School of Physical Science University of Tasmania Hobart Tasmania Australia
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Šlampová A, Malá Z, Gebauer P, Boček P. Recent progress of sample stacking in capillary electrophoresis (2014-2016). Electrophoresis 2016; 38:20-32. [PMID: 27456212 DOI: 10.1002/elps.201600292] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 07/20/2016] [Accepted: 07/20/2016] [Indexed: 12/27/2022]
Abstract
The term "sample stacking" comprises a relatively broad spectrum of techniques that already form an almost inherent part of the methodology of CZE. Their principles are different but the effect is the same: concentration of a diluted analyte into a narrow zone and considerable increase of the method sensitivity. This review brings a survey of papers on electrophoretic sample stacking published approximately since the second quarter of 2014 till the first quarter of 2016. It is organized according to the principles of the stacking methods and includes chapters aimed at the concentration adjustment principle (Kohlrausch stacking), techniques based on pH changes, micellar methods, and other stacking techniques. Not reviewed are papers on transient ITP that are covered by another review in this issue.
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Affiliation(s)
- Andrea Šlampová
- Institute of Analytical Chemistry of the Czech Academy of Sciences, Brno, Czech Republic
| | - Zdena Malá
- Institute of Analytical Chemistry of the Czech Academy of Sciences, Brno, Czech Republic
| | - Petr Gebauer
- Institute of Analytical Chemistry of the Czech Academy of Sciences, Brno, Czech Republic
| | - Petr Boček
- Institute of Analytical Chemistry of the Czech Academy of Sciences, Brno, Czech Republic
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