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Wu ZY, Zhang F, Kuang Z, Fang F, Song YY. Fast and sensitive colorimetric detection of pigments from beverages by gradient zone electrophoresis on a paper based analytical device. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Simultaneous enrichment and separation based on ion concentration polarization effect on a paper based analytical device. Anal Chim Acta 2022; 1208:339844. [DOI: 10.1016/j.aca.2022.339844] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/14/2022] [Accepted: 04/16/2022] [Indexed: 11/23/2022]
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3
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Zhang F, Ji B, Yan XH, Lv S, Fang F, Zhao S, Guo XL, Wu ZY. Paper-based sample processing for the fast and direct MS analysis of multiple analytes from serum samples. Analyst 2022; 147:4895-4902. [DOI: 10.1039/d2an01261h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The direct MS detection of amino acids obtained from serum was successfully demonstrated via a paper-based fast electrokinetic sample clean-up method.
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Affiliation(s)
- Fu Zhang
- Chemistry Department, College of Sciences, Northeastern University, Shenyang 110819, China
| | - Bin Ji
- The First Affiliated Hospital of China Medical University, Shenyang, 110001, China
| | - Xiang-Hong Yan
- Chemistry Department, College of Sciences, Northeastern University, Shenyang 110819, China
| | - Shuang Lv
- Chemistry Department, College of Sciences, Northeastern University, Shenyang 110819, China
| | - Fang Fang
- Chemistry Department, College of Sciences, Northeastern University, Shenyang 110819, China
| | - Shuang Zhao
- Chemistry Department, College of Sciences, Northeastern University, Shenyang 110819, China
| | - Xiao-Lin Guo
- The First Affiliated Hospital of China Medical University, Shenyang, 110001, China
| | - Zhi-Yong Wu
- Chemistry Department, College of Sciences, Northeastern University, Shenyang 110819, China
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4
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Hong J, Hou C, Xu Z, He M, Xu W. Liquid-Phase Ion Trap for Ion Trapping, Transfer, and Sequential Ejection in Solutions. Anal Chem 2020; 92:9065-9071. [PMID: 32441513 DOI: 10.1021/acs.analchem.0c01261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, a new method/mechanism to manipulate ions in solution was developed, based on which liquid-phase ion trap was built. In this liquid-phase ion trap, ion manipulations conventionally performed in a quadrupole ion trap or in a trapped ion mobility spectrometer placed in a vacuum were achieved in solutions. Through theoretical derivation and numerical simulation, it is found that ions have different motional characteristics than those in vacuum. Instead of a radio frequency quadrupole electric field, tunable DC electric fields together with a constant liquid flow were applied to control ion motions in solution. Different ions could be trapped and focused in a potential well, and ion densities could be increased by over 100-fold. By adjusting the DC electric field of the potential well, trapped ions could be transferred into another trapping region or sequentially released for detection. Ions released from the liquid-phase ion trap were then detected by a mass spectrometer interfaced with an electrospray ionization source. Since the ion manipulation mechanism in solution is different and complementary to that in vacuum, the use of a liquid-phase ion trap could also boost detection sensitivity and the mixture analysis capability of a mass spectrometer.
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Affiliation(s)
- Jie Hong
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Chenyue Hou
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Zuqiang Xu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Muyi He
- Institute of Food Safety, Chinese Academy of Inspection & Quarantine, Beijing 100176, China
| | - Wei Xu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
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Peli Thanthri SH, Ward CL, Cornejo MA, Linz TH. Simultaneous Preconcentration and Separation of Native Protein Variants Using Thermal Gel Electrophoresis. Anal Chem 2020; 92:6741-6747. [PMID: 32249567 DOI: 10.1021/acs.analchem.0c00876] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Proteins must maintain proper folding conformations and express the correct post-translational modifications (PTMs) to exhibit appropriate biological activity. However, assessing protein folding and PTMs is difficult because routine polyacrylamide gel electrophoresis (PAGE) methods lack the separation resolution necessary to identify variants of a single protein. Additionally, standard PAGE denatures proteins prior to analysis precluding determinations of folding states or PTMs. To overcome these limitations, a microfluidic thermal gel electrophoresis platform was developed to provide high-sensitivity, high-resolution analyses of native protein variants. A thermally reversible gel was utilized as a separation matrix while in its solid state (30 °C). This thermal gel provided sufficient separation resolution to identify three variants of a fluorescently labeled model protein. To increase detection sensitivity, analyte preconcentration was conducted in parallel with the separation. Continuous analyte enrichment afforded detection limits of 500 fg of protein (250 pM) while simultaneous baseline separation resolution was achieved between variants. The effects of temperature on thermal gel electrophoresis were also characterized. The unique temperature-dependent outcomes illustrated how method performance can be tuned through a thermal dimension. Ultimately, the high detection sensitivity and separation resolution provided by thermal gel electrophoresis enabled rapid screening of native protein variants.
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Affiliation(s)
- Shakila H Peli Thanthri
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202-3489, United States
| | - Cassandra L Ward
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202-3489, United States
| | - Mario A Cornejo
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202-3489, United States
| | - Thomas H Linz
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202-3489, United States
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Ward CL, Linz TH. Characterizing the impact of thermal gels on isotachophoresis in microfluidic devices. Electrophoresis 2020; 41:691-696. [PMID: 32045492 DOI: 10.1002/elps.201900407] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 02/04/2020] [Accepted: 02/07/2020] [Indexed: 02/02/2023]
Abstract
Thermally reversible Pluronic gels have been employed as separation matrices in microfluidic devices in the analysis of biological macromolecules. The phase of these gels can be tuned between liquid and solid states using temperature to vary fluidic resistance and alter peak resolution. Although separations in thermal gels have been characterized, their effect on isotachophoresis has not. This study used fluorescein as a model analyte to evaluate isotachophoretic preconcentration as a function of thermal polymer concentration and temperature. Results demonstrated that increasing polymer concentration in microfluidic channels increased the apparent analyte concentration. A critical minimum of 10% (w/v) Pluronic was required to achieve efficient preconcentration with maximum focusing occurring in 20 and 25% polymer gels. Temperature of the thermal gel also impacted analyte focusing. Most efficient focusing was achieved at 25°C with diminishing analyte accumulation at higher and lower temperatures. Under optimal conditions, isotachophoretic preconcentration increased an additional threefold simply by including thermal gels in the system. This approach can be readily implemented in other applications to increase detection sensitivity and measure low-concentration analytes within simple microfluidic devices.
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Kašička V. Recent developments in capillary and microchip electroseparations of peptides (2013-middle 2015). Electrophoresis 2015; 37:162-88. [DOI: 10.1002/elps.201500329] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Revised: 08/25/2015] [Accepted: 08/25/2015] [Indexed: 12/16/2022]
Affiliation(s)
- Václav Kašička
- Institute of Organic Chemistry and Biochemistry, v.v.i; The Czech Academy of Sciences; Prague Czech Republic
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Štěpánová S, Kašička V. Recent developments and applications of capillary and microchip electrophoresis in proteomic and peptidomic analyses. J Sep Sci 2015; 39:198-211. [DOI: 10.1002/jssc.201500973] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Revised: 10/06/2015] [Accepted: 10/06/2015] [Indexed: 12/19/2022]
Affiliation(s)
- Sille Štěpánová
- Institute of Organic Chemistry and Biochemistry; The Czech Academy of Sciences; Prague Czech Republic
| | - Václav Kašička
- Institute of Organic Chemistry and Biochemistry; The Czech Academy of Sciences; Prague Czech Republic
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Cong Y, Katipamula S, Geng T, Prost SA, Tang K, Kelly RT. Electrokinetic sample preconcentration and hydrodynamic sample injection for microchip electrophoresis using a pneumatic microvalve. Electrophoresis 2015; 37:455-62. [PMID: 26255610 DOI: 10.1002/elps.201500286] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 07/23/2015] [Accepted: 07/24/2015] [Indexed: 12/11/2022]
Abstract
A microfluidic platform was developed to perform online electrokinetic sample preconcentration and rapid hydrodynamic sample injection for zone electrophoresis using a single microvalve. The polydimethylsiloxane microchip comprises a separation channel, a side channel for sample introduction, and a control channel which is used as a pneumatic microvalve aligned at the intersection of the two flow channels. The closed microvalve, created by multilayer soft lithography, serves as a nanochannel preconcentrator under an applied electric potential, enabling current to pass through while preventing bulk flow. Once analytes are concentrated, the valve is briefly opened and the stacked sample is pressure injected into the separation channel for electrophoretic separation. Fluorescently labeled peptides were enriched by a factor of ∼450 in 230 s. This method enables both rapid analyte concentration and controlled injection volume for high sensitivity, high-resolution CE.
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Affiliation(s)
- Yongzheng Cong
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Shanta Katipamula
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Tao Geng
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Spencer A Prost
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Keqi Tang
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Ryan T Kelly
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
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Roelofs SH, van den Berg A, Odijk M. Microfluidic desalination techniques and their potential applications. LAB ON A CHIP 2015; 15:3428-3438. [PMID: 26226407 DOI: 10.1039/c5lc00481k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this review we discuss recent developments in the emerging research field of miniaturized desalination. Traditionally desalination is performed to convert salt water into potable water and research is focused on improving performance of large-scale desalination plants. Microfluidic desalination offers several new opportunities in comparison to macro-scale desalination, such as providing a platform to increase fundamental knowledge of ion transport on the nano- and microfluidic scale and new microfluidic sample preparation methods. This approach has also lead to the development of new desalination techniques, based on micro/nanofluidic ion-transport phenomena, which are potential candidates for up-scaling to (portable) drinking water devices. This review assesses microfluidic desalination techniques on their applications and is meant to contribute to further implementation of microfluidic desalination techniques in the lab-on-chip community.
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Affiliation(s)
- S H Roelofs
- BIOS - the Lab-on-a-Chip group, Mesa+ Institute for Nanotechnology, MIRA Institute, University of Twente, P.O. box 217, 7500 AE Enschede, The Netherlands.
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Malá Z, Gebauer P, Boček P. Recent progress in analytical capillary isotachophoresis. Electrophoresis 2014; 36:2-14. [DOI: 10.1002/elps.201400337] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 08/08/2014] [Accepted: 08/08/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Zdena Malá
- Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic; Brno Czech Republic
| | - Petr Gebauer
- Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic; Brno Czech Republic
| | - Petr Boček
- Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic; Brno Czech Republic
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