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Alnaanah SA, Mendes SB. Investigating the influence of solvent type and pH on protein adsorption onto silica surface by evanescent-wave cavity ring-down spectroscopy. ANAL SCI 2024; 40:1089-1099. [PMID: 38512454 DOI: 10.1007/s44211-024-00529-3] [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: 11/22/2023] [Accepted: 01/31/2024] [Indexed: 03/23/2024]
Abstract
Several studies have explored the adsorption of various proteins onto solid-liquid interfaces, revealing the crucial role of buffer solutions in biological processes. However, a comprehensive evaluation of the buffer's influence on protein absorption onto fused silica is still lacking. This study employs evanescent-wave cavity ring-down spectroscopy (EW-CRDS) to assess the influence of buffer solutions and pH on the adsorption kinetics of three globular proteins: hemoglobin (Hb), myoglobin (Mb), and cytochrome c (Cyt-C) onto fused silica. The EW-CRDS tool, with a ring-down time of 1.4 μ s and a minimum detectable absorbance of 1 × 10 - 6 , enabled precise optical measurements at solid-liquid interfaces. The three heme proteins' adsorption behavior was investigated at pH 7 in three different solvents: deionized (DI) water, tris(hydroxymethyl)-aminomethane hydrochloride (Tris-HCl), and phosphate buffered saline (PBS). For each protein, the surface coverage, the adsorption and desorption constants, and the surface equilibrium constant were optically measured by our EW-CRDS tool. Depending on the nature of each solvent, the proteins showed a completely different adsorption trend on the silica surface. The adsorption of Mb on the silica surface was depressed in the presence of both Tris-HCl and PBS buffers compared with unbuffered (DI water) solutions. In contrast, Cyt-C adsorption appears to be relatively unaffected by the choice of buffer, as it involves strong electrostatic interactions with the surface. Notably, Hb exhibits an opposite trend, with enhanced protein adsorption in the presence of Tris-HCl and PBS buffer. The pH investigations demonstrated that the electrostatic interactions between the proteins and the surface had a major influence on protein adsorption on the silica surface, with adsorption being greatest when the pH values were around the protein's isoelectric point. This study demonstrated the ability of the highly sensitive EW-CRDS tool to study the adsorption events of the evanescent-field-confined protein species in real-time at low surface coverages with fast resolution, making it a valuable tool for studying biomolecule kinetics at solid-liquid interfaces.
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Affiliation(s)
- Shadi A Alnaanah
- Department of Physics and Astronomy, University of Louisville, Louisville, KY, 40208, USA.
- Department of Applied Physics, Tafila Technical University, Al-Eis, Tafila, 66110, Jordan.
| | - Sergio B Mendes
- Department of Physics and Astronomy, University of Louisville, Louisville, KY, 40208, USA
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2
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Hou Z, Luan M, Zhan L, Wang X, Yuan S, Cao K, Sheng Y, Yin H, Liu Y, Huang G. Native Mass Spectrometry for Peptide–Metal Interaction in Picoliter Cell Lysate. Anal Chem 2022; 94:13829-13833. [DOI: 10.1021/acs.analchem.2c02390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhuanghao Hou
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Moujun Luan
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Liujuan Zhan
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Xinchen Wang
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Siming Yuan
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Kaiming Cao
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Yaping Sheng
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Hao Yin
- Mass Spectrometry Lab, Instruments Center for Physical Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Yangzhong Liu
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
| | - Guangming Huang
- Department of Cardiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230001, China
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230001, China
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3
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Gstöttner C, Haselberg R, Wuhrer M, Somsen GW, Domínguez-Vega E. Assessment of Macro- and Microheterogeneity of Monoclonal Antibodies Using Capillary Zone Electrophoresis Hyphenated with Mass Spectrometry. Methods Mol Biol 2022; 2531:125-142. [PMID: 35941483 DOI: 10.1007/978-1-0716-2493-7_9] [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] [Indexed: 06/15/2023]
Abstract
This chapter focuses on the application of capillary zone electrophoresis hyphenated with mass spectrometry (CZE-MS) for the characterization of monoclonal antibodies (mAbs). mAbs are complex molecules comprising different glycoforms and many other posttranslational modifications. In addition to this inherent microheterogeneity, misassembling of antibodies can take place during production contributing to their macroheterogeneity. CZE-MS is a versatile and powerful technique which has demonstrated high potential for the assessment of both micro- and macroheterogeneity of mAbs. In this chapter, technical and practical considerations for the characterization of mAbs by CZE-MS are described. CE-MS interfacing, capillary coatings for the prevention of mAb adsorption, and sample preparation considerations are covered in detail. The assessment of the macro- and microheterogeneity is discussed and exemplified through three different approaches involving analysis of intact, enzymatically digested, and reduced antibodies. The examples also illustrate the use of two commercially available interfacing techniques (i.e., sheath liquid and sheathless) as well as different types of capillary coatings (positively charged and neutral coatings).
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Affiliation(s)
- Christoph Gstöttner
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - Rob Haselberg
- Division of BioAnalytical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Manfred Wuhrer
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Elena Domínguez-Vega
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands.
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4
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Alnaanah SA, Roussel TJ, Ghithan JH, Qatamin AH, Irziqat MA, Telfah H, Liu J, Mendes SB. Electroactive Interface for Enabling Spectroelectrochemical Investigations in Evanescent-Wave Cavity-Ring-Down Spectroscopy. Anal Chem 2020; 92:11288-11296. [PMID: 32689790 DOI: 10.1021/acs.analchem.0c01956] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, we report the development of an electrically active solid-liquid interface for the evanescent-wave cavity-ring-down spectroscopic (EW-CRDS) technique to enable spectroelectrochemical investigations of redox events. Because of a high-quality transparent conductive electrode film of indium tin oxide (ITO) coated on the interface of total internal reflection of the EW-CRDS platform, a cavity ring-down time of about 900 ns was obtained allowing spectroelectrochemical studies at solid-liquid interfaces. As a proof-of-concept on the capabilities of the developed platform, measurements were performed to address the effects of an applied electric potential to the adsorption behavior of the redox protein cytochrome c (Cyt-C) onto different interfaces, namely, bare-ITO, 3-aminopropyl triethoxysilane (APTES), and Cyt-C antibody. For each interface, the adsorption and desorption constants, the surface equilibrium constant, the Gibbs free energy of adsorption, and the surface coverage were optically measured by our electrically active EW-CRDS tool. Optical measurements at a set of constant discrete values of the applied electric potential were acquired for kinetic adsorption analysis. Cyclic voltammetry (CV) scans under synchronous optical readout were performed to study the effects of each molecular interface on the redox process of surface-adsorbed protein species. Overall, the experimental results demonstrate the ability of the electro-active EW-CRDS platform to unambiguously measure electrode-driven redox events of surface-confined molecular species at low submonolayer coverages and at a single diffraction-limited spot. Such capability is expected to open several opportunities for the EW-CRDS technique to investigate a variety of electrochemical phenomena at solid-liquid interfaces.
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Affiliation(s)
- Shadi A Alnaanah
- Department of Physics and Astronomy, University of Louisville, Louisville, Kentucky 40208, United States
| | - Thomas J Roussel
- Department of Bioengineering, University of Louisville, Louisville, Kentucky 40208, United States
| | - Jafar H Ghithan
- Department of Physics and Astronomy, University of Louisville, Louisville, Kentucky 40208, United States
| | - Aymen H Qatamin
- Department of Physics and Astronomy, University of Louisville, Louisville, Kentucky 40208, United States
| | - Mohammed A Irziqat
- Department of Physics and Astronomy, University of Louisville, Louisville, Kentucky 40208, United States
| | - Hamzeh Telfah
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Jinjun Liu
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Sergio B Mendes
- Department of Physics and Astronomy, University of Louisville, Louisville, Kentucky 40208, United States
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5
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Li L, Cao Q, Liu H, Gu Z, Yu Y, Huang F, Zuo C. Transport of polymer-modified nanoparticles in nanochannels coated with polymers. RSC Adv 2019; 9:38944-38951. [PMID: 35540675 PMCID: PMC9075939 DOI: 10.1039/c9ra08365k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 11/18/2019] [Indexed: 12/30/2022] Open
Abstract
Using molecular dynamics simulations based on explicit-solvent model, we study migration of polymer-modified nanoparticles through nanochannels coated with polymers. The polymers densely grafted on the spherical nanoparticle and the channel surface form spherical polymer brush (SPB) and planar polymer brush (PPB), respectively. The migration of the neutral polymer-modified nanoparticle is driven by electroosmotic flow (EOF). The effects of the electric field strength and the SPB–PPB interaction on polymer conformations and transport dynamics of the SPB are explored. The migration velocity of the SPB reduces as the interaction between the SPB and the PPB increases. For strong SPB–PPB interaction, the directional migration of the SPB can be triggered only after the electric field strength exceeds a critical value. The high EOF velocity forces the center of mass of the spherical nanoparticle to keep near the central region of the channel due to high shear rate close to the brush–fluid interface. Unlike electrophoresis of charged polymer-grafted spherical particles, the SPB adopts a more extended conformation in the plane perpendicular to the EOF direction. Using molecular dynamics simulations based on explicit-solvent model, we study migration of polymer-modified nanoparticles through nanochannels coated with polymers.![]()
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Affiliation(s)
- Lujuan Li
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
| | - Qianqian Cao
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
| | - Hao Liu
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
| | - Zhiqing Gu
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
| | - Ying Yu
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
| | - Fengli Huang
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
| | - Chuncheng Zuo
- College of Mechanical and Electrical Engineering, Jiaxing University Jiaxing 314001 P. R. China
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6
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Cao Q. Anisotropic electrokinetic transport in channels modified with patterned polymer brushes. SOFT MATTER 2019; 15:4132-4145. [PMID: 31045197 DOI: 10.1039/c9sm00385a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Molecular dynamics simulations have been used to predict the transport dynamics of fluids through nanochannels with polymer patterning surfaces. The effects of different parameters, such as separation between polymer stripes, solvent quality, and direction and strength of the electric field, were explored in terms of electroosmotic flow transport characteristics, conformational dynamics of the polymer brush and ion distribution. Anisotropic electrokinetic transport becomes significant due to the surface patterning of polymers when the direction of the electric field is changed. At the separation between adjacent polymer stripes comparable to the chain length, local strong flow close to the bare surfaces weakens dramatically under the electric field along the stripe direction. However, when the electric field is switched to the direction perpendicular to the stripes, the flow is enhanced considerably. The coupling of the polymer solvent quality further richens and complicates the transport behaviors. We explain the physical mechanism of the electroosmotic flow in complex polymer patterning channels by analyzing the interrelationship among various properties.
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Affiliation(s)
- Qianqian Cao
- College of Mechanical and Electrical Engineering, Jiaxing University, Jiaxing 314001, P. R. China.
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7
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Domínguez-Vega E, Haselberg R, Somsen GW. Capillary Zone Electrophoresis-Mass Spectrometry of Intact Proteins. Methods Mol Biol 2016; 1466:25-41. [PMID: 27473479 DOI: 10.1007/978-1-4939-4014-1_3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Capillary electrophoresis (CE) coupled with mass spectrometry (MS) has proven to be a powerful analytical tool for the characterization of intact proteins. It combines the high separation efficiency, short analysis time, and versatility of CE with the mass selectivity and sensitivity offered by MS detection. This chapter focuses on important practical considerations when applying CE-MS for the analysis of intact proteins. Technological aspects with respect to the use of CE-MS interfaces and application of noncovalent capillary coatings preventing protein adsorption are treated. Critical factors for successful protein analysis are discussed and four typical CE-MS systems are described demonstrating the characterization of different types of intact proteins by CE-MS. These methodologies comprise the use of sheath-liquid and sheathless CE-MS interfaces, and various types of noncovalent capillary coatings allowing efficient and reproducible protein separations. The discussion includes the analysis of lysozyme-drug conjugates and the therapeutic proteins human growth hormone, human interferon-β-1a, and human erythropoietin.
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Affiliation(s)
- Elena Domínguez-Vega
- Division of BioAnalytical Chemistry, VU University, de Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands
| | - Rob Haselberg
- Division of BioAnalytical Chemistry, VU University, de Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, VU University, de Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands.
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8
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Reactivity of Fe salts in the destabilization of acid mine drainage employing mixing and shaking techniques without pH adjustment. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.minpro.2015.11.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Acunha T, Ibáñez C, Pascual Reguera MI, Sarò M, Navarro R, Alfonso Redondo J, Reinecke H, Gallardo A, Simó C, Cifuentes A. Potential of prodendronic polyamines with modulated segmental charge density as novel coating for fast and efficient analysis of peptides and basic proteins by CE and CE-MS. Electrophoresis 2015; 36:1564-71. [DOI: 10.1002/elps.201400576] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 03/12/2015] [Accepted: 03/12/2015] [Indexed: 01/13/2023]
Affiliation(s)
- Tanize Acunha
- Laboratory of Foodomics; Institute of Food Science Research (CIAL); CSIC; Campus de Cantoblanco Madrid Spain
- CAPES Foundation; Ministry of Education of Brazil; Brasília DF Brazil
| | - Clara Ibáñez
- Laboratory of Foodomics; Institute of Food Science Research (CIAL); CSIC; Campus de Cantoblanco Madrid Spain
| | | | - Mariagiovanna Sarò
- Dipartimento di Scienze del Farmaco e dei Prodotti per la Salute, Facoltà di Farmacia; Università degli Studi di Messina; Messina Italy
| | - Rodrigo Navarro
- Instituto de Ciencia y Tecnología de Polímeros; ICTP-CSIC; Madrid
| | | | - Helmut Reinecke
- Instituto de Ciencia y Tecnología de Polímeros; ICTP-CSIC; Madrid
| | - Alberto Gallardo
- Instituto de Ciencia y Tecnología de Polímeros; ICTP-CSIC; Madrid
| | - Carolina Simó
- Laboratory of Foodomics; Institute of Food Science Research (CIAL); CSIC; Campus de Cantoblanco Madrid Spain
| | - Alejandro Cifuentes
- Laboratory of Foodomics; Institute of Food Science Research (CIAL); CSIC; Campus de Cantoblanco Madrid Spain
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10
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Vitali L, Della Betta F, Costa ACO, Vaz FAS, Oliveira MAL, Pereira Vistuba J, Fávere VT, Micke GA. New multilayer coating using quaternary ammonium chitosan and κ-carrageenan in capillary electrophoresis: Application in fast analysis of betaine and methionine. Talanta 2014; 123:45-53. [DOI: 10.1016/j.talanta.2014.01.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 01/17/2014] [Accepted: 01/20/2014] [Indexed: 10/25/2022]
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11
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Woods DA, Bain CD. Total internal reflection spectroscopy for studying soft matter. SOFT MATTER 2014; 10:1071-1096. [PMID: 24651911 DOI: 10.1039/c3sm52817k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Total internal reflection (TIR) spectroscopy is a widely used technique to study soft matter at interfaces. This tutorial review aims to provide researchers with an overview of the principles, experimental design and applications of TIR spectroscopy to enable them to understand how this class of techniques might be used in their research. It also highlights limitations and pitfalls of TIR techniques, which will assist readers in critically analysing the literature. Techniques covered include attenuated total reflection infrared spectroscopy (ATR-IR), TIR fluorescence, TIR Raman scattering and cavity-enhanced techniques. Other related techniques are briefly described.
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Affiliation(s)
- David A Woods
- Department of Chemistry, Durham University, South Road, Durham, UKDH1 3LE.
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12
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Haselberg R, Flesch FM, Boerke A, Somsen GW. Thickness and morphology of polyelectrolyte coatings on silica surfaces before and after protein exposure studied by atomic force microscopy. Anal Chim Acta 2013; 779:90-5. [DOI: 10.1016/j.aca.2013.03.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 03/25/2013] [Accepted: 03/27/2013] [Indexed: 10/26/2022]
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13
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de Kort BJ, de Jong GJ, Somsen GW. Potential of capillary electrophoresis with wavelength-resolved fluorescence detection for protein unfolding studies using β-lactoglobulin B as a test compound. Analyst 2013; 138:4550-7. [DOI: 10.1039/c3an00357d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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14
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Azadi G, Tripathi A. Surfactant-induced electroosmotic flow in microfluidic capillaries. Electrophoresis 2012; 33:2094-101. [DOI: 10.1002/elps.201100633] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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O'Connell MA, de Cuendias A, Gayet F, Shirley IM, Mackenzie SR, Haddleton DM, Unwin PR. Evanescent wave cavity ring-down spectroscopy (EW-CRDS) as a probe of macromolecule adsorption kinetics at functionalized interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6902-6910. [PMID: 22489550 DOI: 10.1021/la3006053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Evanescent wave cavity ring-down spectroscopy (EW-CRDS) has been employed to study the interfacial adsorption kinetics of coumarin-tagged macromolecules onto a range of functionalized planar surfaces. Such studies are valuable in designing polymers for complex systems where the degree of interaction between the polymer and surface needs to be tailored. Three tagged synthetic polymers with different functionalities are examined: poly(acrylic acid) (PAA), poly(3-sulfopropyl methacrylate, potassium salt) (PSPMA), and a mannose-modified glycopolymer. Adsorption transients at the silica/water interface are found to be characteristic for each polymer, and kinetics are deduced from the initial rates. The chemistry of the adsorption interfaces has been varied by, first, manipulation of silica surface chemistry via the bulk pH, followed by surfaces modified by poly(L-glutamic acid) (PGA) and cellulose, giving five chemically different surfaces. Complementary atomic force microscopy (AFM) imaging has been used for additional surface characterization of adsorbed layers and functionalized interfaces to allow adsorption rates to be interpreted more fully. Adsorption rates for PSPMA and the glycopolymer are seen to be highly surface sensitive, with significantly higher rates on cellulose-modified surfaces, whereas PAA shows a much smaller rate dependence on the nature of the adsorption surface.
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16
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Cao Q, Zuo C, Li L, Zhang Y, Yan G. Electro-osmotic flow in nanochannels with voltage-controlled polyelectrolyte brushes: Dependence on grafting density and normal electric field. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23069] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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17
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Powell HV, O’Connell MA, Zhang M, Mackenzie SR, Unwin PR. Evanescent Wave Cavity Ringdown Spectroscopy: A Platform for the Study of Supported Lipid Bilayers. Anal Chem 2012; 84:2585-91. [DOI: 10.1021/ac203493p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Hayley V. Powell
- Department
of Chemistry, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Michael A. O’Connell
- Department
of Chemistry, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Meiqin Zhang
- Department
of Chemistry, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Stuart R. Mackenzie
- Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, Oxford OX1 3QZ,
United Kingdom
| | - Patrick R. Unwin
- Department
of Chemistry, University of Warwick, Coventry
CV4 7AL, United Kingdom
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18
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Dual polarization interferometric and capillary electrophoretic analysis of supported lipid bilayer constructed on silica-based surface: Evaluation of its anti-protein adsorption effect. Anal Chim Acta 2012; 714:127-33. [DOI: 10.1016/j.aca.2011.11.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 11/27/2011] [Accepted: 11/29/2011] [Indexed: 11/20/2022]
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19
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de Kort BJ, ten Kate GA, de Jong GJ, Somsen GW. Capillary Electrophoresis with Lamp-Based Wavelength-Resolved Fluorescence Detection for the Probing of Protein Conformational Changes. Anal Chem 2011; 83:6060-7. [DOI: 10.1021/ac201136y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Bregje J. de Kort
- Biomolecular Analysis, Department of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - Geert A. ten Kate
- Biomolecular Analysis, Department of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - Gerhardus J. de Jong
- Biomolecular Analysis, Department of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - Govert W. Somsen
- Biomolecular Analysis, Department of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
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20
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Haselberg R, Brinks V, Hawe A, de Jong GJ, Somsen GW. Capillary electrophoresis-mass spectrometry using noncovalently coated capillaries for the analysis of biopharmaceuticals. Anal Bioanal Chem 2011; 400:295-303. [PMID: 21318246 PMCID: PMC3062027 DOI: 10.1007/s00216-011-4738-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 12/24/2010] [Accepted: 01/27/2011] [Indexed: 10/29/2022]
Abstract
In this work, the usefulness of capillary electrophoresis-electrospray ionization time-of-flight-mass spectrometry for the analysis of biopharmaceuticals was studied. Noncovalently bound capillary coatings consisting of Polybrene-poly(vinyl sulfonic acid) or Polybrene-dextran sulfate-Polybrene were used to minimize protein and peptide adsorption, and achieve good separation efficiencies. The potential of the capillary electrophoresis-mass spectrometry (CE-MS) system to characterize degradation products was investigated by analyzing samples of the drugs, recombinant human growth hormone (rhGH) and oxytocin, which had been subjected to prolonged storage, heat exposure, and/or different pH values. Modifications could be assigned based on accurate masses as obtained with time-of-flight-mass spectrometry (TOF-MS) and migration times with respect to the parent compound. For heat-exposed rhGH, oxidations, sulfonate formation, and deamidations were observed. Oxytocin showed strong deamidation (up to 40%) upon heat exposure at low pH, whereas at medium and high pH, mainly dimer (>10%) and trisulfide formation (6-7%) occurred. Recombinant human interferon-β-1a (rhIFN-β) was used to evaluate the capability of the CE-MS method to assess glycan heterogeneity of pharmaceutical proteins. Analysis of this N-glycosylated protein revealed a cluster of resolved peaks which appeared to be caused by at least ten glycoforms differing merely in sialic acid and hexose N-acetylhexosamine composition. Based on the relative peak area (assuming an equimolar response per glycoform), a quantitative profile could be derived with the disialytated biantennary glycoform as most abundant (52%). Such a profile may be useful for in-process and quality control of rhIFN-β batches. It is concluded that the separation power provided by combined capillary electrophoresis and TOF-MS allows discrimination of highly related protein species.
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Affiliation(s)
- R Haselberg
- Department of Biomedical Analysis, Utrecht University, PO Box 80082, 3508 TB Utrecht, The Netherlands.
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Schnippering M, Neil SRT, Mackenzie SR, Unwin PR. Evanescent wave cavity-based spectroscopic techniques as probes of interfacial processes. Chem Soc Rev 2011; 40:207-20. [DOI: 10.1039/c0cs00017e] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Haselberg R, de Jong GJ, Somsen GW. Capillary electrophoresis–mass spectrometry of intact basic proteins using Polybrene–dextran sulfate–Polybrene-coated capillaries: System optimization and performance. Anal Chim Acta 2010; 678:128-34. [DOI: 10.1016/j.aca.2010.08.032] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Revised: 08/23/2010] [Accepted: 08/25/2010] [Indexed: 10/19/2022]
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de Kort BJ, de Jong GJ, Somsen GW. Lamp-based wavelength-resolved fluorescence detection for protein capillary electrophoresis: Setup and detector performance. Electrophoresis 2010; 31:2861-8. [DOI: 10.1002/elps.201000246] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Powell HV, Schnippering M, Cheung M, Macpherson JV, Mackenzie SR, Stavros VG, Unwin PR. Probing Redox Reactions of Immobilized Cytochrome c Using Evanescent Wave Cavity Ring-Down Spectroscopy in a Thin-Layer Electrochemical Cell. Chemphyschem 2010; 11:2985-91. [DOI: 10.1002/cphc.201000213] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Research Spotlight: Research at the Biomedical Analysis Group of the University Utrecht, The Netherlands. Bioanalysis 2010; 2:941-7. [DOI: 10.4155/bio.10.41] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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