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Zhang W, Xiang Y, Xu W. Probing protein higher-order structures by native capillary electrophoresis-mass spectrometry. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Tan C, Hong J, Xu W. Ion Bunching in Square-Wave-Driven Mobility Capillary Electrophoresis-Mass Spectrometry. Anal Chem 2022; 94:13682-13690. [PMID: 36170210 DOI: 10.1021/acs.analchem.2c01134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ion-bunching effect was typically produced for ion beams in the gas phase, such as in ion accelerators. In this work, ion bunching was generated for ions in a liquid channel, specifically in a mobility capillary electrophoresis-mass spectrometry (MCE-MS) setup. MCE was recently developed and coupled with MS for ion separation and the precise measurements of ion hydrodynamic radius and effective charge in solution. In conventional MCE, a DC high voltage is applied, which serves as the separation voltage. In this study, square waves were employed to replace this DC voltage, and the ion-bunching phenomenon was observed and characterized in both simulations and experiments. After applying a high voltage square wave, cations and anions would be bunched and concentrated at the positive and negative half cycle of the square wave, respectively. Accordingly, ion signal intensities detected by the following mass spectrometer could be increased by up to ∼50 folds for the aspartic acid anion. This square wave could also dissociate metal adduct cations from nucleic acid anions, which results in stronger nucleic acid ion intensities (up to ∼10 folds) with cleaner backgrounds.
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Affiliation(s)
- Congrui Tan
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Jie Hong
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Wei Xu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
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3
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Štěpánová S, Kašička V. Applications of capillary electromigration methods for separation and analysis of proteins (2017–mid 2021) – A review. Anal Chim Acta 2022; 1209:339447. [DOI: 10.1016/j.aca.2022.339447] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 01/04/2022] [Accepted: 01/04/2022] [Indexed: 12/11/2022]
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4
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Kumar R, Guttman A, Rathore AS. Applications of capillary electrophoresis for biopharmaceutical product characterization. Electrophoresis 2021; 43:143-166. [PMID: 34591322 DOI: 10.1002/elps.202100182] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/07/2021] [Accepted: 09/23/2021] [Indexed: 12/16/2022]
Abstract
Capillary electrophoresis (CE), after being introduced several decades ago, has carved out a niche for itself in the field of analytical characterization of biopharmaceutical products. It does not only offer fast separation, high resolution in miniaturized format, but equally importantly represents an orthogonal separation mechanism to high-performance liquid chromatography. Therefore, it is not surprising that CE-based methods can be found in all major pharmacopoeias and are recommended for the analysis of biopharmaceutical products during process development, characterization, quality control, and release testing. Different separation formats of CE, such as capillary gel electrophoresis, capillary isoelectric focusing, and capillary zone electrophoresis are widely used for size and charge heterogeneity characterization as well as purity and stability testing of therapeutic proteins. Hyphenation of CE with MS is emerging as a promising bioanalytical tool to assess the primary structure of therapeutic proteins along with any impurities. In this review, we confer the latest developments in capillary electrophoresis, used for the characterization of critical quality attributes of biopharmaceutical products covering the past 6 years (2015-2021). Monoclonal antibodies, due to their significant share in the market, have been given prioritized coverage.
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Affiliation(s)
- Ramesh Kumar
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India
| | - Andras Guttman
- Horváth Csaba Memorial Laboratories of Bioseparation Sciences, Research Center for Molecular Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.,Translational Glycomics Group, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Veszprem, Hungary
| | - Anurag S Rathore
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India
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5
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Moser MR, Baker CA. Taylor dispersion analysis in fused silica capillaries: a tutorial review. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:2357-2373. [PMID: 33999088 DOI: 10.1039/d1ay00588j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Biological and pharmaceutical analytes like liposomes, therapeutic proteins, nanoparticles, and drug-delivery systems are utilized in applications, such as pharmaceutical formulations or biomimetic models, in which controlling their size is often critical. Many of the common techniques for sizing these analytes require method development, significant sample preparation, large sample quantities, and lengthy analysis times. In other cases, such as DLS, sizing can be biased towards the largest constituents in a mixture. Therefore, there is a need for more rapid, sensitive, accurate, and straightforward analytical methods for sizing macromolecules, especially those of biological origin which may be sample-limited. Taylor dispersion analysis (TDA) is a sizing technique that requires no calibration and consumes only nL to pL sample volumes. In TDA, average diffusion coefficients are determined via the Taylor-Aris equation by characterizing band broadening of an analyte plug under well-controlled laminar flow conditions. Diffusion coefficient can then be interpreted as hydrodynamic radius (RH) via the Stokes-Einstein equation. Here, we offer a tutorial review of TDA, intended to make the method better understood and more widely accessible to a community of analytical chemists and separations scientists who may benefit from the unique advantages of this versatile sizing method. We first provide a tutorial on the fundamental principles that allow TDA to achieve calibration-free sizing of analytes across a wide range of RH, with an emphasis on the reduced sample consumption and analysis times that result from utilizing fused silica capillaries. We continue by highlighting relationships between operating parameters and critically important flow conditions. Our discussion continues by looking at methods for applying TDA to sample mixtures via algorithmic approaches and integration of capillary electrophoresis and TDA. Finally, we present a selection of reports that demonstrate TDA applied to complex challenges in bioanalysis and materials science.
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Affiliation(s)
- Meagan R Moser
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
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Hoang Anh N, Min JE, Kim SJ, Phuoc Long N. Biotherapeutic Products, Cellular Factories, and Multiomics Integration in Metabolic Engineering. ACTA ACUST UNITED AC 2020; 24:621-633. [DOI: 10.1089/omi.2020.0112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Nguyen Hoang Anh
- College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Jung Eun Min
- College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Sun Jo Kim
- College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Nguyen Phuoc Long
- Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea
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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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Zhang Y, Tang Y, Tan C, Xu W. Toward Nanopore Electrospray Mass Spectrometry: Nanopore Effects in the Analysis of Bacteria. ACS CENTRAL SCIENCE 2020; 6:1001-1008. [PMID: 32607447 PMCID: PMC7318062 DOI: 10.1021/acscentsci.0c00622] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Indexed: 05/13/2023]
Abstract
The shape and structure analyses capability of nanopore is powerful and complementary to mass spectrometry analysis. It is extremely attractive but challenging to integrate these two techniques. The feasibility of combining nanopore electrospray with mass spectrometry was explored in this study. A nanopore effect was observed during the nano-electrospray of single bacterium, through which the shape and dimension of a single bacterium could be obtained. Molecular information on these bacteria was then acquired by analyzing these bacteria deposited on the counter electrode through laser spray ionization mass spectrometry experiments. Proof-of-concept experiments were carried out for four types of bacteria. Results show that the combination of nanopore results with mass spectrum data could effectively improve the identification accuracy of these bacteria from 72.5% to 100%. Although initial experiments were demonstrated in this work, results showed that it is feasible and promising to integrate nanopore technology with mass spectrometry for large biomolecule studies in the near future.
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Affiliation(s)
| | | | | | - Wei Xu
- . Web: http://www.escience.cn/people/weixu
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Wu H, Zhang R, Zhang W, Hong J, Xiang Y, Xu W. Rapid 3-dimensional shape determination of globular proteins by mobility capillary electrophoresis and native mass spectrometry. Chem Sci 2020; 11:4758-4765. [PMID: 34122932 PMCID: PMC8159243 DOI: 10.1039/d0sc01965h] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Established high-throughput proteomics methods provide limited information on the stereostructures of proteins. Traditional technologies for protein structure determination typically require laborious steps and cannot be performed in a high-throughput fashion. Here, we report a new medium throughput method by combining mobility capillary electrophoresis (MCE) and native mass spectrometry (MS) for the 3-dimensional (3D) shape determination of globular proteins in the liquid phase, which provides both the geometric structure and molecular mass information of proteins. A theory was established to correlate the ion hydrodynamic radius and charge state distribution in the native mass spectrum with protein geometrical parameters, through which a low-resolution structure (shape) of the protein could be determined. Our test data of 11 different globular proteins showed that this approach allows us to determine the shapes of individual proteins, protein complexes and proteins in a mixture, and to monitor protein conformational changes. Besides providing complementary protein structure information and having mixture analysis capability, this MCE and native MS based method is fast in speed and low in sample consumption, making it potentially applicable in top–down proteomics and structural biology for intact globular protein or protein complex analysis. Using native mass spectrometry and mobility capillary electrophoresis, the ellipsoid dimensions of globular proteins or protein complexes could be measured efficiently.![]()
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Affiliation(s)
- Haimei Wu
- School of Life Science, Beijing Institute of Technology No. 5 South Zhongguancun Street, Haidian Dist Beijing China
| | - Rongkai Zhang
- School of Life Science, Beijing Institute of Technology No. 5 South Zhongguancun Street, Haidian Dist Beijing China
| | - Wenjing Zhang
- School of Life Science, Beijing Institute of Technology No. 5 South Zhongguancun Street, Haidian Dist Beijing China
| | - Jie Hong
- School of Life Science, Beijing Institute of Technology No. 5 South Zhongguancun Street, Haidian Dist Beijing China
| | - Ye Xiang
- Department of Basic Medical Sciences, School of Medicine, Tsinghua University Beijng China
| | - Wei Xu
- School of Life Science, Beijing Institute of Technology No. 5 South Zhongguancun Street, Haidian Dist Beijing China
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Hong J, Wu H, Zhang R, He M, Xu W. The Coupling of Taylor Dispersion Analysis and Mass Spectrometry to Differentiate Protein Conformations. Anal Chem 2020; 92:5200-5206. [DOI: 10.1021/acs.analchem.9b05745] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Hong
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Haimei Wu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Rongkai Zhang
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Muyi He
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
- 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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Zhang W, Wu H, Zhang R, Fang X, Xu W. Structure and effective charge characterization of proteins by a mobility capillary electrophoresis based method. Chem Sci 2019; 10:7779-7787. [PMID: 31588326 PMCID: PMC6761862 DOI: 10.1039/c9sc02039j] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 07/02/2019] [Indexed: 12/18/2022] Open
Abstract
Measuring the conformations and effective charges of proteins in solution is critical for investigating protein bioactivity, but their rapid analysis remains a challenging problem. Here we report a mobility capillary electrophoresis (MCE) based method for the rapid analysis of protein stereo-structures and effective charges in different solution environments. With the capability of mixture separation, MCE measures the hydrodynamic radius of a protein through Taylor dispersion analysis and its effective charge through ion mobility analysis. The experimental results acquired from MCE are then utilized to restrain molecular dynamics simulations, so that the most probable conformation of that protein can be obtained. As proof-of-concept demonstrations, the charge states and structures of five proteins were analyzed under close to native environments. The conformation transitions and charge state variations of bovine serum albumin and lysozyme under different pH conditions were also investigated. This method is promising for high-throughput protein analysis, which could potentially be coupled with mass spectrometry for investigating protein stereo-structures and functions in top-down proteomics.
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Affiliation(s)
- Wenjing Zhang
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhongguancun Street, Haidian Dist , Beijing , China .
| | - Haimei Wu
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhongguancun Street, Haidian Dist , Beijing , China .
| | - Rongkai Zhang
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhongguancun Street, Haidian Dist , Beijing , China .
| | - Xiang Fang
- National Institute of Metrology , No. 18, Bei San Huan Dong Lu, Chaoyang Dist , Beijing , China
| | - Wei Xu
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhongguancun Street, Haidian Dist , Beijing , China .
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Zhang F, Hong J, Xu W, Qu F. Straight nano-electrospray ionization and its coupling of mobility capillary electrophoresis to mass spectrometry. Talanta 2019; 206:120183. [PMID: 31514879 DOI: 10.1016/j.talanta.2019.120183] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 07/24/2019] [Accepted: 07/26/2019] [Indexed: 12/18/2022]
Abstract
Mobility capillary electrophoresis (MCE) was developed previously in our group, which has the capabilities of ion separation and biomolecule hydrodynamic radius analysis. The coupling of MCE with mass spectrometry (MS) would greatly improve complex sample identification capability as well as system detection sensitivity. In the present study, a simple and robust ionization source, named as straight nano-electrospray ionization (nanoESI) source was developed, which was applied to couple MCE with MS. A stainless-steel needle attached directly at the end of an MCE capillary was used as the nanoESI emitter, and the connection between this emitter to the liquid flow in the MCE separation channel was established through a liquid bridge. After optimization, this straight nanoESI source enhanced the ion signal intensity by ~10 times when compared with a commercial nanoESI source. The MCE-straight nanoESI-MS system was also characterized in terms of mixture separation and peptide hydrodynamic radius measurements. Compared to our previous work when a UV detector was used in a commercial Lumex CE system (model Capel 105 M, St. Petersburg, Russia), peptides with much lower concentrations could be analyzed (from ~1 mg/mL to ~20 μg/mL) in terms of radius measurement.
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Affiliation(s)
- Fei Zhang
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Jie Hong
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Wei Xu
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China.
| | - Feng Qu
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China.
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