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Li L, Song YP, Ren DD, Li TX, Gao MH, Zhou L, Zeng ZC, Pu QA. A compact and high-performance setup of capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C 4D). Analyst 2024; 149:3034-3040. [PMID: 38624147 DOI: 10.1039/d4an00354c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D) has the advantages of high throughput (simultaneous detection of multiple ions), high separation efficiency (higher than 105 theoretical plates) and rapid analysis capability (less than 5 min for common inorganic ions). A compact CE-C4D system is ideal for water quality control and on-site analysis. It is suitable not only for common cations (e.g. Na+, K+, Li+, NH4+, Ca2+, etc.) and anions (e.g. Cl-, SO42-, BrO3-, etc.) but also for some ions (e.g. lanthanide ions, Pb2+, Cd2+, etc.) that require complex derivatization procedures to be detected by ion chromatography (IC). However, an obvious limitation of the CE-C4D method is that its sensitivity (e.g. 0.3-1 μM for common inorganic ions) is often insufficient for trace analysis (e.g. 1 ppb or 20 nM level for common inorganic ions) without preconcentration. For this technology to become a powerful and routine analytical technique, the system should be made compact while maintaining trace analysis sensitivity. In this study, we developed an all-in-one version of the CE-C4D instrument with custom-made modular components to make it a convenient, compact and high-performance system. The system was designed using direct digital synthesis (DDS) technology to generate programmable sinusoidal waveforms with any frequency for excitation, a kilovolt high-voltage power supply for capillary electrophoresis separation, and an "effective" differential C4D cell with a low-noise circuitry for high-sensitivity detection. We characterized the system with different concentrations of Cs+, and even a low concentration of 20 nM was detectable without preconcentration. Moreover, the optimized CE-C4D setup was applied to analyse mixed ions at a trace concentration of 200 nM with excellent signal-to-noise ratios. In typical applications, the limits of detection based on the 3σ criterion (without baseline filtering) were 9, 10, 24, 5, and 12 nM for K+, Cs+, Li+, Ca2+, and Mg2+, respectively, and about 7, 6, 6 and 6 nM for Br-, ClO4-, BrO3- and SO42-, respectively. Finally, the setup was also applied for the analysis of all 14 lanthanide ions and rare-earth minerals, and it showed an improvement in sensitivity by more than 25 times.
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Affiliation(s)
- Lin Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Yun-Peng Song
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Dou-Dou Ren
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Tang-Xiu Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Ming-Hui Gao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Lei Zhou
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Zhi-Cong Zeng
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
| | - Qi-Aosheng Pu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, China.
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2
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Kaljurand M, Růžička M, Gorbatsova J, Mazina-Šinkar J. Evaluation of different operating modes of an autosampler for portable capillary electrophoresis. J Chromatogr A 2023; 1705:464201. [PMID: 37451197 DOI: 10.1016/j.chroma.2023.464201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 06/29/2023] [Accepted: 07/04/2023] [Indexed: 07/18/2023]
Abstract
A compact, inexpensive sampler instrument for portable capillary electrophoresis (CE) was developed and tested to monitor common inorganic ions in drinking water samples. The sampler uses peristaltic and vacuum pumps and pinch and check valves to control liquid flows. The paper also addresses various aspects of CE associated with portability, open access instrumentation and prospects of CE for citizen science. The extensive use of items provided by the electronic and computer industry contributes to this trend.
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Affiliation(s)
- Mihkel Kaljurand
- Department of Chemistry and Biotechnology, School of Science, Tallinn University of Technology, Tallinn 12618, Estonia.
| | - Martin Růžička
- Department of Chemistry and Biotechnology, School of Science, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Jelena Gorbatsova
- Department of Chemistry and Biotechnology, School of Science, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Jekaterina Mazina-Šinkar
- Department of Chemistry and Biotechnology, School of Science, Tallinn University of Technology, Tallinn 12618, Estonia
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3
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Hu C, Xie B, Li H, Xiao D. A five-electrode capacitively coupled contactless conductivity detector with a low limit of detection. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:2253-2261. [PMID: 37128967 DOI: 10.1039/d3ay00328k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The conductivity detector is a broadly used device that allows for the highly efficient detection of analytes, and continuous efforts have been directed toward lowering the limit of detection. In this study, a five-electrode capacitively coupled contactless conductivity detector (TIC4D) is proposed, which uses copper mesh between the electrodes for a grounding shield to reduce the interference of stray capacitance and noise. After adding the copper mesh shield, the difference value between the response signal and baseline at low KCl concentration is effectively increased, achieving 33 mV for 10-9 M KCl solution. Meanwhile, for the unshielded detector, the difference is only 18 mV for the KCl solution at the same concentration. The response signal shows a linear function of the logarithm at the range of 10-4 M to 10-5 M KCl solution, and the TIC4D detector displays a higher slope (0.8448) than the conventional single-input capacitively coupled contactless conductivity detector (C4D: 0.5579) and dual-input capacitively coupled contactless conductivity detectors (DIC4D: 0.6173). Moreover, two TIC4D detectors are combined to achieve a dual-channel six-input differential capacitively coupled contactless conductivity detector (SIDC4D), reducing the high baseline levels caused by the multi-signal input. By differentially amplifying the output signal, the high baseline levels and noise interference can be effectively reduced. For the 10-3 M KCl solution, the ratio of the response signal to baseline for SIDC4D can reach 8.500, almost 7 times that of TIC4D, and a lower limit of detection (LOD) of 3 × 10-10 M is also achieved. This work may open a new door based on coupled contactless conductivity for detection performance.
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Affiliation(s)
- Chunqiong Hu
- College of Chemical Engineering, Sichuan University, Chengdu 610064, China.
| | - Bo Xie
- College of Chemical Engineering, Sichuan University, Chengdu 610064, China.
| | - Hongmei Li
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Dan Xiao
- College of Chemical Engineering, Sichuan University, Chengdu 610064, China.
- College of Chemistry, Sichuan University, Chengdu 610064, China
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4
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Van Schepdael A. Capillary electrophoresis as a simple and low-cost analytical tool for use in money-constrained situations. Trends Analyt Chem 2023. [DOI: 10.1016/j.trac.2023.116992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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5
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Do YN, Kieu TLP, Dang THM, Nguyen QH, Dang TH, Tran CS, Vu AP, Do TT, Nguyen TN, Dinh SL, Nguyen TMT, Pham TNM, Hoang AQ, Pham B, Nguyen TAH. Green Analytical Method for Simultaneous Determination of Glucosamine and Calcium in Dietary Supplements by Capillary Electrophoresis with Capacitively Coupled Contactless Conductivity Detection. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2023; 2023:2765508. [PMID: 36760655 PMCID: PMC9904918 DOI: 10.1155/2023/2765508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/25/2022] [Accepted: 11/24/2022] [Indexed: 06/18/2023]
Abstract
The need for analytical methods that are fast, affordable, and ecologically friendly is expanding. Because of its low solvent consumption, minimal waste production, and speedy analysis, capillary electrophoresis is considered a "green" choice among analytical separation methods. With these "green" features, we have utilized the capillary electrophoresis method with capacitively coupled contactless conductivity detection (CE-C4D) to simultaneously determine glucosamine and Ca2+ in dietary supplements. The CE analysis was performed in fused silica capillaries (50 μm inner diameter, 40 cm total length, 30 cm effective length), and the analytical time was around 5 min. After optimization, the CE conditions for selective determination of glucosamine and Ca2+ were obtained, including a 10 mM tris (hydroxymethyl) aminomethane/acetic acid (Tris/Ace) buffer of pH 5.0 as the background electrolyte; separation voltage of 20 kV; and hydrodynamic injection (siphoning) at 25 cm height for 30 s. The method illustrated good linearity over the concentration range of 5.00 to 200 mg/L of for glucosamine (R 2 = 0.9994) and 1.00 to 100 mg/L for Ca2+ (R 2 = 0.9994). Under the optimum conditions, the detection limit of glucosamine was 1.00 mg/L, while that of Ca2+ was 0.05 mg/L. The validated method successfully analyzed glucosamine and Ca2+ in seven dietary supplement samples. The measured concentrations were generally in line with the values of label claims and with cross-checking data from reference methods (HPLC and ICP-OES).
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Affiliation(s)
- Yen Nhi Do
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Thi Lan Phuong Kieu
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
- National Institute for Food Control (NIFC), 65 Pham Than Duat, Hanoi 10000, Vietnam
| | - Thi Huyen My Dang
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Quang Huy Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
- Faculty of Pharmacy, University of Medicine and Pharmacy, Thai Nguyen University, 284 Luong Ngoc Quyen, Thai Nguyen 24000, Vietnam
| | - Thu Hien Dang
- National Institute for Food Control (NIFC), 65 Pham Than Duat, Hanoi 10000, Vietnam
| | - Cao Son Tran
- National Institute for Food Control (NIFC), 65 Pham Than Duat, Hanoi 10000, Vietnam
| | - Anh Phuong Vu
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong, Hanoi 10000, Vietnam
| | - Thi Trang Do
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong, Hanoi 10000, Vietnam
| | - Thi Ngan Nguyen
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong, Hanoi 10000, Vietnam
| | - Son Luong Dinh
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong, Hanoi 10000, Vietnam
| | - Thi Minh Thu Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Thi Ngoc Mai Pham
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Anh Quoc Hoang
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Bach Pham
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Thi Anh Huong Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, 19 Le Thanh Tong, Hanoi 10000, Vietnam
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Růžička M, Kaljurand M, Gorbatšova J, Mazina-Šinkar J. Autosampler for portable capillary electrophoresis. J Chromatogr A 2022; 1685:463619. [DOI: 10.1016/j.chroma.2022.463619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/27/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022]
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7
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Kaljurand M, Mazina-Šinkar J. Portable capillary electrophoresis as a green analytical technology. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Huyen My Dang T, Quoc Hoang A, Huy Nguyen Q, Chi Le D, Duc Mai T, Nhi Do Y, Anh Kieu V, Khanh Cao C, Minh Hien Lu T, Minh Thu Nguyen T, Pham B, Anh Huong Nguyen T. Simultaneous determination of vitamin B 6 and magnesium using capillary electrophoresis coupled with contactless conductivity detection: Method development, validation, and application to pharmaceutical and nutraceutical samples. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1210:123471. [PMID: 36174264 DOI: 10.1016/j.jchromb.2022.123471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 09/09/2022] [Accepted: 09/13/2022] [Indexed: 11/29/2022]
Abstract
Vitamins and minerals are usually incorporated in pharmaceutical and nutraceutical products, but a simple, rapid, and inexpensive analytical method for their simultaneous determination is still lacking. In this study, we developed a quantification method for pyridoxine (vitamin B6) and magnesium (Mg) by using purpose-made capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D) instrument. Main analytical conditions include: fused silica capillary (total length 55 cm, effective length 40 cm, inner diameter 50 μm); background electrolyte consisted of 10 mM L-arginine/acetic acid (pH 5) with 20% acetonitrile; separation voltage + 20 kV; hydrodynamic injection (siphoning at 20 cm in 25 s). Detection limits of vitamin B6 and Mg were 1 and 0.1 mg/L, respectively. Good linearity (R2 > 0.999) was observed for vitamin B6 and Mg calibration curves over concentration ranges of 3-100 and 0.3-200 mg/L, respectively. The method was applied to analyze vitamin B6 and Mg in several pharmaceutical and nutraceutical samples. The analytical results obtained by our method were in good agreement with reference methods (i.e., HPLC for vitamin B6 and ICP-OES for Mg). High-efficient and low-cost CE-C4D method can accordingly serve as a promising tool for concurrent analysis of inorganic and organic species in pharmaceutical and nutraceutical analysis.
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Affiliation(s)
- Thi Huyen My Dang
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam
| | - Anh Quoc Hoang
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam.
| | - Quang Huy Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam; Faculty of Pharmacy, University of Medicine and Pharmacy, Thai Nguyen University, 284, Luong Ngoc Quyen, Thai Nguyen 24000, Vietnam
| | - Dinh Chi Le
- Department of Analytical Chemistry and Toxicology, Hanoi University of Pharmacy, 13-15 Le Thanh Tong, Hanoi 10000, Vietnam
| | - Thanh Duc Mai
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Yen Nhi Do
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam
| | - Van Anh Kieu
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam
| | - Cong Khanh Cao
- National Institute for Food Control (NIFC), 65, Pham Than Duat, Hanoi 10000, Vietnam
| | - Thi Minh Hien Lu
- National Institute for Food Control (NIFC), 65, Pham Than Duat, Hanoi 10000, Vietnam
| | - Thi Minh Thu Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam
| | - Bach Pham
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam
| | - Thi Anh Huong Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19, Le Thanh Tong, Hanoi 10000, Vietnam.
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9
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A Study on Double Inputs Direct Contact and Single Output Capacitively Coupled Conductivity Detector. SENSORS 2022; 22:s22072729. [PMID: 35408343 PMCID: PMC9003331 DOI: 10.3390/s22072729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/23/2022] [Accepted: 03/27/2022] [Indexed: 12/03/2022]
Abstract
In this paper, an improved double inputs direct contact and single output capacitively coupled conductivity detector (DISODCD) based on traditional contactless capacitively coupled conductivity detector (C4D) is developed. The sensor uses double inputs of the contact electrode and capacitively coupled output of the contactless electrode and a lock-in amplifier to reduce interfering noise signals and amplify gain. Parallel circuit counteracts the part of the adverse capacitance reactance introduced by electrode polarization and reduces the effect of the impedance caused by the coupled wall capacitance to measure the resistance of solution. The sensor reduces limit of detection (LOD) of analyte and improves the sensitivity of the device. The LOD of the potassium chloride solution is 1 nM, and the detection range is 0.01 μM to 10 mM in actual testing for a single sample. The ratio of the response of potassium chloride solution to background ultrapure water at low concentrations is better than that of double input capacitively coupled contactless conductivity detector (DIC4D) and direct contact conductivity detection (DCD) under the same condition. In the case that the test cell is contaminated with impurities, pollution of impurities has little effect on the response of DISODCD. In practical application, it has a good service life.
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Lackey H, Bottenus D, Liezers M, Shen S, Branch S, Katalenich J, Lines A. A versatile and low-cost chip-to-world interface: Enabling ICP-MS characterization of isotachophoretically separated lanthanides on a microfluidic device. Anal Chim Acta 2020; 1137:11-18. [PMID: 33153594 DOI: 10.1016/j.aca.2020.08.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 08/20/2020] [Accepted: 08/24/2020] [Indexed: 11/28/2022]
Abstract
Microfluidics offer novel and state-of-the-art pathways to process materials. Microfluidic systems drastically reduce timeframes and costs associated with traditional lab-scale efforts in the area of analytical sample preparations. The challenge arises in effectively connecting microfluidics to off-chip analysis tools to accurately characterize samples after treatment on-chip. Fabrication of a chip-to-world connection includes one end of a fused silica capillary interfaced to the outlet of a microfluidic device (MFD). The other end of the capillary is connected to a commercially available CEI-100 interface that passes samples into an inductively coupled plasma mass spectrometer (ICP-MS). This coupling creates an inexpensive and simple chip-to-world connection that enables on-chip and off-chip methods of analyzing the separation of rare earth elements. Specifically, this is demonstrated by utilizing isotachophoresis (ITP) on a microfluidic chip to separate up to 14 lanthanides from a homogenous sample into elementally pure bands. The separated analyte zones are successfully transferred across a 7 nL void volume at the microchip-capillary junction, such that separation resolution is maintained and even increased through the interface and into the ICP-MS, where the elemental composition of the sample is analyzed. Lanthanide samples of varying composition are detected using ICP-MS, demonstrating this versatile and cost-effective approach, which maintains the separation quality achieved on the MFD. This simple connection enables fast, low-cost sample preparation immediately prior to injection into an ICP-MS or other analytical instrument.
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Affiliation(s)
- Hope Lackey
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Danny Bottenus
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA.
| | - Martin Liezers
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Steve Shen
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Shirmir Branch
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Jeff Katalenich
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Amanda Lines
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA.
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11
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Liénard-Mayor T, Furter JS, Taverna M, Pham HV, Hauser PC, Mai TD. Modular instrumentation for capillary electrophoresis with laser induced fluorescence detection using plug-and-play microfluidic, electrophoretic and optic modules. Anal Chim Acta 2020; 1135:47-54. [PMID: 33070858 DOI: 10.1016/j.aca.2020.08.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 08/07/2020] [Accepted: 08/14/2020] [Indexed: 12/16/2022]
Abstract
This study reports on the development of a novel instrument for capillary electrophoresis (CE) coupled with laser induced fluorescence (LIF) detection that is inspired by the Lego-toy concept. The Lego CE-LIF design is an evolution of purpose-made CE instrumentation, allowing the users to construct their own analytical device with a high degree of standardization (i.e. a "standard" setup) without requirement of mechanical and electronic workshop facilities. To allow instrument reproduction outside the original fabrication laboratory, which is not trivial for in-house-built CE systems, the new design is based on unprecedent 'plugging' hyphenation of various off-the-shelf parts available for microfluidics, optics and electrophoresis. To render the operation with Lego CE-LIF optimal, we developed a new background electrolyte (BGE), using for the first time extremely high concentrations of zwitterionic and large weakly charged species for much improvement of detection sensitivity. The Lego CE-LIF was demonstrated for separation and detection of oligosaccharides labelled with 8-aminopyrene-1,3,6-trisulfonic acid (APTS). The new gel-free BGE for oligosaccharide analysis also allowed simplification of the conventional CE-LIF protocol used with commercial instruments while keeping satisfactory separation performances. Furthermore, the new BGE is fully compatible with a non-thermostatted Lego CE instrument thanks to low current and therefore low heat generation under application of a high voltage.
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Affiliation(s)
- Théo Liénard-Mayor
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Jasmine S Furter
- University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland
| | - Myriam Taverna
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France; Institut Universitaire de France (IUF), France
| | - Hung Viet Pham
- VNU Key Laboratory of Analytical Technology for Environmental Quality and Food Safety Control (KLATEFOS), VNU University of Science, Vietnam National University, Hanoi (VNU), Nguyen Trai Street 334, Hanoi, Viet Nam
| | - Peter C Hauser
- University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland.
| | - Thanh Duc Mai
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France.
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Huang X, Xiao D, Tong Y, Chen Z. A sensitive photochemical reaction-capacitively coupled contactless conductivity detection system for HPLC and its application in determination of Cyclosporin A. Talanta 2020; 206:120242. [DOI: 10.1016/j.talanta.2019.120242] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 08/05/2019] [Accepted: 08/07/2019] [Indexed: 01/23/2023]
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13
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Nguyen TAH, Pham TNM, Le TB, Le DC, Tran TTP, Nguyen TQH, Nguyen TKT, Hauser PC, Mai TD. Cost-effective capillary electrophoresis with contactless conductivity detection for quality control of beta-lactam antibiotics. J Chromatogr A 2019; 1605:360356. [DOI: 10.1016/j.chroma.2019.07.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 07/06/2019] [Accepted: 07/06/2019] [Indexed: 01/16/2023]
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14
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Pham TNM, Le TB, Le DD, Ha TH, Nguyen NS, Pham TD, Hauser PC, Nguyen TAH, Mai TD. Determination of carbapenem antibiotics using a purpose-made capillary electrophoresis instrument with contactless conductivity detection. J Pharm Biomed Anal 2019; 178:112906. [PMID: 31634756 DOI: 10.1016/j.jpba.2019.112906] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 09/20/2019] [Accepted: 10/01/2019] [Indexed: 01/15/2023]
Abstract
In this study, the employment of a purpose-made capillary electrophoresis (CE) instrument with capacitively coupled contactless conductivity detection (C4D) as a simple and cost-effective approach for simultaneous determination of different carbapenem antibiotics is reported. The developed CE-C4D approach was for the first time applied for quality control of various pharmaceutical formulations in Vietnam, as well as for therapeutic monitoring of these antibiotics in plasma samples from patients under intensive care. Four of the most popular carbapenems in Vietnam, doripenem, meropenem, imipenem and ertapenem, were determined using an electrolyte composed of 10 mM Tris adjusted to pH 8.0 with acetic acid. The best detection limits achieved using the developed CE-C4D method were 0.36 mg/L and 0.45 mg/L for pharmaceutical and plasma samples, respectively. Good agreement between results from CE-C4D and the confirmation method (HPLC-PDA) was achieved, with a coefficient of determination (r2) for the two pairs of data of 0.9967.
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Affiliation(s)
- Thi Ngoc Mai Pham
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, Viet Nam
| | - Thai Binh Le
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, Viet Nam
| | - Duc Dung Le
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, Viet Nam
| | - Tran Hung Ha
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong Road, Dong Da, Hanoi, Viet Nam
| | - Ngoc Son Nguyen
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, Viet Nam
| | - Tien Duc Pham
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, Viet Nam
| | - Peter C Hauser
- University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland
| | - Thi Anh Huong Nguyen
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, Viet Nam.
| | - Thanh Duc Mai
- Institut Galien Paris Sud, UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS), CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, 5 Rue Jean Baptiste Clément, 92290, Châtenay-Malabry, France.
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Tang M, Xu J, Xu Z. Simultaneous determination of metal ions by capillary electrophoresis with contactless conductivity detection and insights into the effects of BGE component. Microchem J 2019. [DOI: 10.1016/j.microc.2019.04.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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16
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Kubáň P, Hauser PC. Contactless conductivity detection for analytical techniques: Developments from 2016 to 2018. Electrophoresis 2018; 40:124-139. [PMID: 30010203 DOI: 10.1002/elps.201800248] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 07/10/2018] [Accepted: 07/10/2018] [Indexed: 01/05/2023]
Abstract
The publications concerning capacitively coupled contactless conductivity detection for the 2-year period from mid-2016 to mid-2018 are covered in this update to the earlier reviews of the series. Relatively few reports on fundamental investigations or new designs have appeared in the literature in this time interval, but the development of new applications with the detection method has continued strongly. Most often, contactless conductivity measurements have been employed for the detection of inorganic or small organic ions in conventional capillary electrophoresis, less often in microchip electrophoresis. A number of other uses, such as detection in chromatography or the gauging of bubbles in streams have also been reported.
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Affiliation(s)
- Pavel Kubáň
- Institute of Analytical Chemistry of the Czech Academy of Sciences, Brno, Czech Republic
| | - Peter C Hauser
- Department of Chemistry, University of Basel, Basel, Switzerland
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17
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Paul P, Sänger-van de Griend C, Adams E, Van Schepdael A. A simple, low-cost and robust capillary zone electrophoresis method with capacitively coupled contactless conductivity detection for the routine determination of four selected penicillins in money-constrained laboratories. Electrophoresis 2018; 39:2521-2529. [DOI: 10.1002/elps.201800033] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 03/21/2018] [Accepted: 03/30/2018] [Indexed: 01/13/2023]
Affiliation(s)
- Prasanta Paul
- KU Leuven-University of Leuven; Pharmaceutical Analysis; Department of Pharmaceutical and Pharmacological Sciences; Leuven Belgium
| | - Cari Sänger-van de Griend
- Analytical Pharmaceutical Chemistry; Uppsala University; Husargatan Sweden
- Kantisto BV; Calenburglaan The Netherlands
| | - Erwin Adams
- KU Leuven-University of Leuven; Pharmaceutical Analysis; Department of Pharmaceutical and Pharmacological Sciences; Leuven Belgium
| | - Ann Van Schepdael
- KU Leuven-University of Leuven; Pharmaceutical Analysis; Department of Pharmaceutical and Pharmacological Sciences; Leuven Belgium
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18
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Voeten RLC, Ventouri IK, Haselberg R, Somsen GW. Capillary Electrophoresis: Trends and Recent Advances. Anal Chem 2018; 90:1464-1481. [PMID: 29298038 PMCID: PMC5994730 DOI: 10.1021/acs.analchem.8b00015] [Citation(s) in RCA: 187] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Robert L C Voeten
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Vrije Universiteit Amsterdam , de Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.,TI-COAST , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Iro K Ventouri
- TI-COAST , Science Park 904, 1098 XH Amsterdam, The Netherlands.,Analytical Chemistry Group, van't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Rob Haselberg
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Vrije Universiteit Amsterdam , de Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Vrije Universiteit Amsterdam , de Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
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19
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Le THH, Nguyen TQH, Tran CS, Vu TT, Nguyen TL, Cao VH, Ta TT, Pham TNM, Nguyen TAH, Mai TD. Screening determination of food additives using capillary electrophoresis coupled with contactless conductivity detection: A case study in Vietnam. Food Control 2017. [DOI: 10.1016/j.foodcont.2017.02.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Vu AP, Nguyen TN, Do TT, Doan TH, Ha TH, Ta TT, Nguyen HL, Hauser PC, Nguyen TAH, Mai TD. Clinical screening of paraquat in plasma samples using capillary electrophoresis with contactless conductivity detection: Towards rapid diagnosis and therapeutic treatment of acute paraquat poisoning in Vietnam. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1060:111-117. [PMID: 28609698 DOI: 10.1016/j.jchromb.2017.06.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 05/26/2017] [Accepted: 06/05/2017] [Indexed: 10/19/2022]
Abstract
The employment of a purpose-made capillary electrophoresis (CE) instrument with capacitively coupled contactless conductivity detection (C4D) as a simple and cost-effective solution for clinical screening of paraquat in plasma samples for early-stage diagnosis of acute herbicide poisoning is reported. Paraquat was determined using an electrolyte composed of 10mM histidine adjusted to pH 4 with acetic acid. A detection limit of 0.5mg/L was achieved. Good agreement between results from CE-C4D and the confirmation method (HPLC-UV) was obtained, with relative errors for the two pairs of data better than 20% for 31 samples taken from paraquat-intoxicated patients. The results were used by medical doctors for identification and prognosis of acute paraquat poisoning cases. The objective of the work is the deployment of the developed approach in rural areas in Vietnam as a low-cost solution to reduce the mortality rate due to accidental or suicidal ingestion of paraquat.
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Affiliation(s)
- Anh Phuong Vu
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong road, Dong Da, Hanoi, Viet Nam; Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hanoi, Viet Nam(1)
| | - Thi Ngan Nguyen
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong road, Dong Da, Hanoi, Viet Nam; Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hanoi, Viet Nam(1)
| | - Thi Trang Do
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong road, Dong Da, Hanoi, Viet Nam; Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hanoi, Viet Nam(1)
| | - Thu Ha Doan
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong road, Dong Da, Hanoi, Viet Nam
| | - Tran Hung Ha
- Poison Control Center, Bach Mai Hospital, 78 Giai Phong road, Dong Da, Hanoi, Viet Nam
| | - Thi Thao Ta
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hanoi, Viet Nam(1)
| | - Hung Long Nguyen
- Vietnam Food Administration, Ministry of Health, 138A Giang Vo, Ba Đinh, Hanoi, Viet Nam
| | - Peter C Hauser
- University of Basel, Department of Chemistry, Spitalstrasse 51, 4056 Basel, Switzerland
| | - Thi Anh Huong Nguyen
- Department of Analytical Chemistry, Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi - 19 Le Thanh Tong, Hanoi, Viet Nam(1).
| | - Thanh Duc Mai
- PNAS, Institut Galien de Paris-Sud, Faculté de Pharmacie, Université Paris-Sud, CNRS, 5 rue JB Clément, 92296 Châtenay-Malabry, France.
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21
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Yelkenci HE, Öztekin N. Separation and Sensitive Detection of Lanthanides by Capillary Electrophoresis and Contactless Conductivity Detection. J Chromatogr Sci 2017; 55:465-470. [PMID: 27988487 DOI: 10.1093/chromsci/bmw200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 11/29/2016] [Indexed: 11/12/2022]
Abstract
A rapid and sensitive capillary zone electrophoresis method for the simultaneous separation and determination of lanthanide ions, combined with capacitively coupled contactless conductivity detection (C4D), is reported. The influence of experimental parameters on separation was investigated. The optimal separation conditions were obtained when 4.5 mM 2-hydroxyisobutyric acid and 1 mM acetic acid (HAc) at pH 4.5 were used as buffer solution. Under these conditions, complete separation of all 14 lanthanide ions was achieved in 6 min. With the use of the C4D detector, the sensitive detection of non-UV active lanthanide ions was achieved without the need of a UV active ligand or a visualization agent. The sensitivities were further enhanced with a sample stacking procedure. The limits of detection were to be found between 2.77 and 8.26 nmol/L and the limits of quantification were between 9.29 and 27.5 nmol/L for 14 lanthanide ions.
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Affiliation(s)
- H Ecem Yelkenci
- Department of Chemistry, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
| | - Nevin Öztekin
- Department of Chemistry, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
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22
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Yu J, Yang S, Lu Q, Sun D, Zheng J, Zhang X, Wang X, Yang W. Evaluation of liquid cathode glow discharge-atomic emission spectrometry for determination of copper and lead in ores samples. Talanta 2017; 164:216-221. [DOI: 10.1016/j.talanta.2016.11.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/20/2016] [Accepted: 11/01/2016] [Indexed: 11/24/2022]
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23
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Gamat SN, Fotouhi L, Talebpour Z. The application of electrochemical detection in capillary electrophoresis. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2016. [DOI: 10.1007/s13738-016-1023-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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