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Mikhail IE, Tehranirokh M, Gooley AA, Guijt RM, Breadmore MC. In-Syringe Electrokinetic Ampholytes Focusing Coupled with Electrospray Ionization Mass Spectrometry. Anal Chem 2019; 91:8259-8266. [DOI: 10.1021/acs.analchem.9b00942] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ibraam E. Mikhail
- ARC Training Centre for Portable
Analytical Separation Technologies (ASTech)
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences (Chemistry), University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia
- Department of Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura City 35516, Egypt
| | - Masoomeh Tehranirokh
- ARC Training Centre for Portable
Analytical Separation Technologies (ASTech)
- Trajan Scientific and Medical, Ringwood, Victoria 3134, Australia
| | - Andrew A. Gooley
- ARC Training Centre for Portable
Analytical Separation Technologies (ASTech)
- Trajan Scientific and Medical, Ringwood, Victoria 3134, Australia
| | - Rosanne M. Guijt
- ARC Training Centre for Portable
Analytical Separation Technologies (ASTech)
- Deakin University, Centre for Regional and Rural Futures, Geelong, Victoria 3220, Australia
| | - Michael C. Breadmore
- ARC Training Centre for Portable
Analytical Separation Technologies (ASTech)
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences (Chemistry), University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia
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2
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Charge-based separation of proteins and peptides by electrically induced dynamic pH profiles. J Chromatogr A 2016; 1431:166-175. [DOI: 10.1016/j.chroma.2015.12.070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Revised: 12/27/2015] [Accepted: 12/28/2015] [Indexed: 12/27/2022]
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Glovinová E, Pospíchal J. Effective Pre-Concentration and Analysis of Heavy Metals Using Ligand Step Gradient Focusing in Combination with Isotachophoresis. Chromatographia 2012. [DOI: 10.1007/s10337-012-2345-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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4
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Páger C, Dörnyei Á, Kilár F. Sequential injection setup for capillary isoelectric focusing combined with MS detection. Electrophoresis 2011; 32:1875-84. [DOI: 10.1002/elps.201100012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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5
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Membrane-assisted capillary isoelectric focusing coupling with matrix-assisted laser desorption/ionization-Fourier transform mass spectrometry for neuropeptide analysis. J Chromatogr A 2011; 1218:5336-43. [PMID: 21696746 DOI: 10.1016/j.chroma.2011.05.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 05/13/2011] [Accepted: 05/18/2011] [Indexed: 12/30/2022]
Abstract
Herein we report a highly efficient and reliable membrane-assisted capillary isoelectric focusing (MA-CIEF) system being coupled with MALDI-FTMS for the analysis of complex neuropeptide mixtures. The new interface consists of two membrane-coated joints made near each end of the capillary for applying high voltage, while the capillary ends were placed in the two reservoirs which were filled with anolyte (acid) and catholyte (base) to provide pH difference. Optimizations of CIEF conditions and comparison with conventional CIEF were carried out by using bovine serum albumin (BSA) tryptic peptides. It was shown that the MA-CIEF could provide more efficient, reliable and faster separation with improved sequence coverage when coupled to MALDI-FTMS. Analyses of orcokinin family neuropeptides from crabs Cancer borealis and Callinectes sapidus brain extracts have been conducted using the established MA-CIEF/MALDI-FTMS platform. Increased number of neuropeptides was observed with significantly enhanced MS signal in comparison with direct analysis by MALDI-FTMS. The results highlighted the potential of MA-CIEF as an efficient fractionation tool for coupling to MALDI MS for neuropeptide analysis.
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Šišperová E, Glovinová E, Budilová J, Pospíchal J. Focusing of alkali earth metals in ligand step gradient. J Chromatogr A 2011; 1218:3105-10. [DOI: 10.1016/j.chroma.2011.03.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 03/11/2011] [Accepted: 03/14/2011] [Indexed: 11/16/2022]
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Wang T, Ma J, Wu S, Sun L, Yuan H, Zhang L, Liang Z, Zhang Y. On-line combination of monolithic immobilized pH gradient-based capillary isoelectric focusing and capillary zone electrophoresis via a partially etched porous interface for protein analysis. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:804-10. [PMID: 21397573 DOI: 10.1016/j.jchromb.2011.02.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 02/10/2011] [Accepted: 02/10/2011] [Indexed: 10/18/2022]
Abstract
An integrated platform consisting of monolithic immobilized pH gradient-based capillary isoelectric focusing (M-IPG CIEF) and capillary zone electrophoresis (CZE) coupled by a partially etched porous interface was established. Since carrier ampholytes (CAs) were immobilized on monolith in M-IPG CIEF to form a stable pH gradient, subsequent depletion of CAs at the interface to prevent the interference on CZE separation and detection were avoided. Moreover, a partially etched porous capillary column, which was facile for fabrication and durable for operation, was exploited as the interface to combine M-IPG CIEF and CZE. The RSD values in terms of the migration time for M-IPG CIEF separation, transfer protein from the first dimension to the second dimension, and CZE separation, were 2.4%, 3.9% and 2.3%, respectively. With a 6-protein mixture as the sample, two-dimensional capillary electrophoresis (2D-CE) separation was successfully completed within 116 min, yielding a peak capacity of ∼200 even with minute sample amount down to 5.0 μg/mL. The limit of detection was 0.2 μg/mL. In addition, proteins extracted from milk were used to test the performance of such a 2D-CE separation platform. We expect that such a novel 2D-CE system would provide a promising tool for protein separation with high throughput and high peak capacity.
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Affiliation(s)
- Tingting Wang
- Key Laboratory of Separation Science for Analytical Chemistry, National Chromatographic Research and Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
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8
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Zhang W, Chen JF, Fan LY, Cao CX, Ren JC, Li S, Shao J. A novel isotachophoresis of cobalt and copper complexes by metal ion substitution reaction in a continuous moving chelation boundary. Analyst 2010; 135:140-8. [DOI: 10.1039/b912799b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Guo L, Qiu B, Chen M, Chen G. A new method for preparation of an etched porous joint for capillary electrophoresis and its pore-size evaluation. Electrophoresis 2009; 30:1355-61. [DOI: 10.1002/elps.200800510] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Recent developments in capillary isoelectric focusing. J Chromatogr A 2008; 1204:157-70. [DOI: 10.1016/j.chroma.2008.05.057] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Revised: 04/30/2008] [Accepted: 05/08/2008] [Indexed: 12/22/2022]
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12
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Cao CX, Fan LY, Zhang W. Review on the theory of moving reaction boundary, electromigration reaction methods and applications in isoelectric focusing and sample pre-concentration. Analyst 2008; 133:1139-57. [DOI: 10.1039/b807450j] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Han M, Guo A, Jochheim C, Zhang Y, Martinez T, Kodama P, Pettit D, Balland A. Analysis of Glycosylated Type II Interleukin-1 Receptor (IL-1R) by Imaged Capillary Isoelectric Focusing (i-cIEF). Chromatographia 2007. [DOI: 10.1365/s10337-007-0338-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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14
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Zhang LH, Zhang CJ, Chen X, Feng YQ, Wu XZ. In-capillary solid-phase extraction-capillary electrophoresis for the determination of chlorophenols in water. Electrophoresis 2006; 27:3224-32. [PMID: 16865667 DOI: 10.1002/elps.200500700] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A novel CE method combined with SPE in a single capillary was developed for analysis of chlorophenols in water. A frit of 0.5 mm was first made by a sol-gel method, followed by packing a SPE sorbent in the inlet end of the capillary. Two phenol derivatives, 2,4-dichlorophenol and 2,4,5-trichlorophenol, were used as the model compounds. By loading sample solutions into the capillary, the two chlorophenols were extracted into the sorbent. They were desorbed by injecting only about 4 nL of methanol. Finally, the analytes were separated by conventional CE. The technique provided a concentration enhancement factor of over 4000-fold for both chlorophenols. The detection limits (S/N = 3) of 2,4-dichlorophenol and 2,4,5-trichlorophenol were determined to be 0.1 ng/mL and 0.07 ng/mL, respectively. For replicate analyses of 5 ng/mL of 2,4-dichlorophenol, within-day and between-day RSDs of migration time, peak height and peak area were in the range of 1.8-2.0%, 4.0-4.4% and 4.1-4.6%, respectively. The method shows wide linear range, acceptable reproducibility and excellent sensitivity, and it was applied to the analyses of spiked river water samples. The capillary packed with the SPE sorbents can be used for more than 400 runs without performance deterioration.
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Affiliation(s)
- Luo-Hong Zhang
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, Fukui, Japan
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Abstract
This review article with 304 references describes recent developments in CE of proteins, and covers the two years since the previous review (Hutterer, K., Dolník, V., Electrophoresis 2003, 24, 3998-4012) through Spring 2005. It covers topics related to CE of proteins, including modeling of the electrophoretic migration of proteins, sample pretreatment, wall coatings, improving separation, various forms of detection, special electrophoretic techniques such as affinity CE, CIEF, and applications of CE to the analysis of proteins in real-world samples including human body fluids, food and agricultural samples, protein pharmaceuticals, and recombinant protein preparations.
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Zhang LH, Zhang CJ, Wu XZ. Isoelectric Focusing Sample Injection for Capillary Zone Electrophoresis in a Fused Silica Capillary. ANAL SCI 2006; 22:1039-41. [PMID: 16837761 DOI: 10.2116/analsci.22.1039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
An improvement has been made to couple isoelectric focusing (IEF) sample injection and capillary zone electrophoresis in an untreated fused silica capillary. Electroosmotic flow is efficiently prevented by simply using a rubber block at the outlet end of the capillary during IEF sample injection. The experimental conditions that affect the concentration effect are discussed. A concentration enhancement factor of over 100-fold can be easily obtained for two model proteins: lysozyme and ribonuclease A.
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Affiliation(s)
- Luo-Hong Zhang
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, Bunkyo 3-9-1. Fukui 910-8507, Japan
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Wu XZ, Umeda R. In-capillary preconcentration of proteins for capillary electrophoresis using a cellulose acetate-coated porous joint. Anal Bioanal Chem 2005; 382:848-52. [PMID: 15906013 DOI: 10.1007/s00216-005-3136-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2004] [Revised: 01/26/2005] [Accepted: 01/31/2005] [Indexed: 10/25/2022]
Abstract
This work describes the in-capillary preconcentration of proteins using a cellulose acetate-coated porous joint. The capillary wall near the inlet end of a capillary was made porous by HF etching. During the etching process, a voltage was applied across the capillary wall and the electric current across it was monitored. As the current passed through the capillary wall, it became porous. A solution of cellulose acetate in acetone was added to the etched porous joint. After the acetone was evaporated off, a cellulose acetate-coated porous joint was formed. To preconcentrate the protein ions, an electric voltage was applied between the inlet end of the capillary and the coated porous joint; the protein ions electromigrated to the porous joint but could not pass through it, while the buffer ions could pass easily through the joint. After allowing a certain amount of time for protein preconcentration, a separation voltage was applied across the two ends of the capillary, and normal capillary electrophoresis was carried out. The preconcentration factors for cytochrome c, lysozyme, ribonuclease, and chymotrypsinogen were 65, 155, 705, and 800, respectively. The cellulose acetate-coated porous joint was shown to be strong and stable over time, and was used to analyze trace proteins and macromolecules in biological samples.
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Affiliation(s)
- Xing-Zheng Wu
- Department of Materials Science and Engineering, Faculty of Engineering, Fukui University, Bunkyo 3-9-1, Fukui 910-8507, Japan.
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