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Nattich-Rak M, Kosior D, Morga M, Adamczyk Z. Kinetics of Human Serum Albumin Adsorption on Polycation Functionalized Silica. Biomolecules 2024; 14:531. [PMID: 38785938 PMCID: PMC11117822 DOI: 10.3390/biom14050531] [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: 03/23/2024] [Revised: 04/15/2024] [Accepted: 04/25/2024] [Indexed: 05/25/2024] Open
Abstract
The adsorption kinetics of human serum albumin (HSA) on bare and poly-L-arginine (PARG)-modified silica substrates were investigated using reflectometry and atomic force microscopy (AFM). Measurements were carried out at various pHs, flow rates and albumin concentrations in the 10 and 150 mM NaCl solutions. The mass transfer rate constants and the maximum protein coverages were determined for the bare silica at pH 4.0 and theoretically interpreted in terms of the hybrid random sequential adsorption model. These results were used as reference data for the analysis of adsorption kinetics at larger pHs. It was shown that the adsorption on bare silica rapidly decreased with pH and became negligible at pH 7.4. The albumin adsorption on PARG-functionalized silica showed an opposite trend, i.e., it was negligible at pH 4 and attained maximum values at pH 7.4 and 150 mM NaCl, the conditions corresponding to the blood serum environment. These results were interpreted as the evidence of a significant role of electrostatic interactions in the albumin adsorption on the bare and PARG-modified silica. It was also argued that our results can serve as useful reference data enabling a proper interpretation of protein adsorption on substrates functionalized by polyelectrolytes.
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Affiliation(s)
| | - Dominik Kosior
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland; (M.N.-R.); (M.M.)
| | | | - Zbigniew Adamczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland; (M.N.-R.); (M.M.)
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2
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Żeliszewska P, Wasilewska M, Szych J, Adamczyk Z. Mechanism of Anti-Salmonella Rabbit Immunoglobulin Adsorption on Polymer Particles. Biomolecules 2023; 13:1390. [PMID: 37759790 PMCID: PMC10526532 DOI: 10.3390/biom13091390] [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: 08/11/2023] [Revised: 09/07/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023] Open
Abstract
The adsorption of anti-Salmonella rabbit immunoglobulin (IgaR) on negatively charged polymer particles leading to the formation of immunolatex was studied using various techniques comprising atomic force microscopy (AFM) and laser Doppler velocimetry (LDV). Initially, the basic physicochemical properties of IgaR molecules and the particles, inter alia their electrophoretic mobilities, the zeta potentials and hydrodynamic diameters, were determined under different ionic strengths and pHs. Applying AFM, single immunoglobulin molecules adsorbed on mica were also imaged, which allowed to determine their size. The adsorption of the IgaR molecules on the particles leading to changes in their electrophoretic mobility was monitored in situ using the LDV method. The obtained results were interpreted applying a general electrokinetic model which yielded quantitative information about the molecule coverage on the particles. The obtained immunolatex was thoroughly characterized with respect to its acid-base properties and its stability upon storage. Notably, the developed procedure demonstrated better efficiency compared to commercially applied methods, characterized by a higher immunoglobulin consumption.
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Affiliation(s)
- Paulina Żeliszewska
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Science, Niezapominajek 8, 30-239 Krakow, Poland;
| | - Monika Wasilewska
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Science, Niezapominajek 8, 30-239 Krakow, Poland;
| | - Jolanta Szych
- Biomex Co., Ltd., ul. Friedleina 4-6 lok. 117, 30-009 Krakow, Poland;
| | - Zbigniew Adamczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Science, Niezapominajek 8, 30-239 Krakow, Poland;
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3
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Nattich-Rak M, Sadowska M, Motyczyńska M, Adamczyk Z. Mimicking Pseudo-Virion Interactions with Abiotic Surfaces: Deposition of Polymer Nanoparticles with Albumin Corona. Biomolecules 2022; 12:1658. [PMID: 36359008 PMCID: PMC9687657 DOI: 10.3390/biom12111658] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 11/02/2022] [Accepted: 11/02/2022] [Indexed: 10/14/2023] Open
Abstract
Adsorption of human serum albumin (HSA) molecules on negatively charged polystyrene microparticles was studied using the dynamic light scattering, the electrophoretic and the solution depletion methods involving atomic force microscopy. Initially, the physicochemical characteristics of the albumin comprising the hydrodynamic diameter, the zeta potential and the isoelectric point were determined as a function of pH. Analogous characteristics of the polymer particles were acquired, including their size and zeta potential. The formation of albumin corona on the particles was investigated in situ by electrophoretic mobility measurements. The size, stability and electrokinetic properties of the particles with the corona were also determined. The particle diameter was equal to 125 nm, which coincides with the size of the SARS-CoV-2 virion. The isoelectric point of the particles appeared at a pH of 5. The deposition kinetics of the particles was determined by atomic force microscopy (AFM) under diffusion and by quartz microbalance (QCM) under flow conditions. It was shown that the deposition rate at a gold sensor abruptly vanished with pH following the decrease in the zeta potential of the particles. It is postulated that the acquired results can be used as useful reference systems mimicking virus adsorption on abiotic surfaces.
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Affiliation(s)
- Małgorzata Nattich-Rak
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Cracow, Poland
| | - Marta Sadowska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Cracow, Poland
| | - Maja Motyczyńska
- The Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, ul. Gronostajowa 7, 30-387 Cracow, Poland
| | - Zbigniew Adamczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Cracow, Poland
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4
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Wasilewska M, Żeliszewska P, Pogoda K, Deptuła P, Bucki R, Adamczyk Z. Human Vimentin Layers on Solid Substrates: Adsorption Kinetics and Corona Formation Investigations. Biomacromolecules 2022; 23:3308-3317. [PMID: 35829774 PMCID: PMC9364323 DOI: 10.1021/acs.biomac.2c00415] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/27/2022] [Indexed: 11/28/2022]
Abstract
Adsorption kinetics of human vimentin on negatively charged substrates (mica, silica, and polymer particles) was analyzed using atomic force microscopy (AFM), quartz microbalance (QCM), and the laser doppler velocimetry (LDV) method. AFM studies realized under diffusion conditions proved that the adsorbed protein layer mainly consisted of aggregates in the form of compact tetramers and hexamers of a size equal to 11-12 nm. These results were consistent with vimentin adsorption kinetics under flow conditions investigated by QCM. It was established that vimentin aggregates efficiently adsorbed on the negatively charged silica sensor at pH 3.5 and 7.4, forming compact layers with the coverage reaching 3.5 mg m-2. Additionally, the formation of the vimentin corona at polymer particles was examined using the LDV method and interpreted in terms of the electrokinetic model. This allowed us to determine the zeta potential of the corona as a function of pH and the electrokinetic charge of aggregates, which was equal to -0.7 e nm-2 at pH 7.4 in a 10 mM NaCl solution. The anomalous adsorption of aggregates exhibiting an average negative charge on the negatively charged substrates was interpreted as a result of a heterogeneous charge distribution. These investigations confirmed that it is feasible to deposit stable vimentin layers both at planar substrates and at carrier particles with well-controlled coverage and zeta potential. They can be used for investigations of vimentin interactions with various ligands including receptors of the innate immune system, immunoglobulins, bacterial virulence factors, and spike proteins of viruses.
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Affiliation(s)
- Monika Wasilewska
- Jerzy
Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, PL-30239 Krakow, Poland
| | - Paulina Żeliszewska
- Jerzy
Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, PL-30239 Krakow, Poland
| | - Katarzyna Pogoda
- Institute
of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Piotr Deptuła
- Department
of Medical Microbiology and Nanobiomedical Engineering, Medical University of Białystok, PL-15222 Białystok, Poland
| | - Robert Bucki
- Department
of Medical Microbiology and Nanobiomedical Engineering, Medical University of Białystok, PL-15222 Białystok, Poland
| | - Zbigniew Adamczyk
- Jerzy
Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, PL-30239 Krakow, Poland
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5
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Random sequential adsorption: An efficient tool for investigating the deposition of macromolecules and colloidal particles. Adv Colloid Interface Sci 2022; 306:102692. [DOI: 10.1016/j.cis.2022.102692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 04/26/2022] [Accepted: 05/03/2022] [Indexed: 11/18/2022]
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6
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Adamczyk Z, Morga M, Nattich-Rak M, Sadowska M. Nanoparticle and bioparticle deposition kinetics. Adv Colloid Interface Sci 2022; 302:102630. [PMID: 35313169 DOI: 10.1016/j.cis.2022.102630] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 02/25/2022] [Accepted: 02/25/2022] [Indexed: 12/11/2022]
Abstract
Mechanisms and kinetic of particle deposition at solid surfaces leading to the formation of self-assembled layers of controlled structure and density were reviewed. In the first part theoretical aspects were briefly discussed, comprising limiting analytical solutions for the linear transport under flow and diffusion. Methods of the deposition kinetics analysis for non-linear regimes affected by surface blocking were also considered. Characteristic monolayer formation times under diffusion and flow for the nanoparticle size range were calculated. In the second part illustrative experimental results obtained for micro- and nanoparticles were discussed. Deposition at planar substrates was analyzed with emphasis focused on the stability of layers and the release kinetics of silver particles. Applicability of the quartz microbalance measurements (QCM) for quantitative studies of nanoparticle deposition kinetic was also discussed. Except for noble metal and polymer particles, representative results for virus deposition at abiotic surfaces were analyzed. Final part of the review was devoted to nanoparticle corona formation at polymer carrier particles investigated by combination of the concentration depletion, AFM, SEM and the in situ electrokinetic method. It is argued that the results obtained for colloid particles can be used as reliable reference systems for interpretation of protein and other bioparticle deposition, confirming the thesis that simple is universal.
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Affiliation(s)
- Zbigniew Adamczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland.
| | - Maria Morga
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland.
| | - Małgorzata Nattich-Rak
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
| | - Marta Sadowska
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
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7
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Dąbkowska M, Rogińska D, Kłos P, Sobuś A, Adamczak M, Litwińska Z, Machalińska A, Machaliński B. Electrostatic complex of neurotrophin 4 with dendrimer nanoparticles: controlled release of protein in vitro and in vivo. Int J Nanomedicine 2019; 14:6117-6131. [PMID: 31534337 PMCID: PMC6682179 DOI: 10.2147/ijn.s210140] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 06/04/2019] [Indexed: 12/24/2022] Open
Abstract
Background: NT4 has been regarded as a promising therapeutic protein for treatment of damaged retinal pigment epithelium cells. Purpose: Here, we studied physicochemical parameters of an NT4–polyamidoamine (PAMAM) electrostatic complex, which can provide a sustained concentration of protein in intraocular space over an extended period after delivery. Adsorption/desorption of NT4 molecules to/from positively charged PAMAM dendrimers were precisely determined to control the concentration of bounded/unbounded protein molecules, diffusion coefficient, and size of a protein-laden dendrimer structure. We determined kinetics of NT4 desorption in PBS, vitreous, and damaged retina. Methods: Initially, adsorption of NT4 molecules on PAMAM dendrimers was studied in PBS using dynamic light scattering, electrophoresis, solution depletion, ELISA, and atomic force microscopy. This allowed us precisely to determine desorption of NT4 from nanoparticles under in situ conditions. The maximum coverage of irreversibly adsorbed NT4 determined by ELISA allowed us to devise a robust procedure for preparing stable and well-controlled coverage of NT4 on PAMAM nanoparticles. Thereafter, we studied diffusion of nanospheres containing NT4 molecules by injecting them into vitreous cavities of mice exposed to intravenous injections of sodium iodate and evaluated their intraocular desorption kinetics from drug carriers in vivo. Results: Our measurements revealed NT4–dendrimer nanoparticles can be used for continuous neurotrophic factor delivery, enhancing its distribution into mouse vitreous, as well as damaged retina over 28 days of postinjury observation. Conclusion: Understanding of polyvalent neurotrophin interactions with dendrimer nanoparticles might be useful to obtain well-ordered protein layers, targeting future development of drug-delivery systems, especially for neuroprotection of damaged retinal neurons.
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Affiliation(s)
- Maria Dąbkowska
- Department of Medical Chemistry, Pomeranian Medical University, Szczecin 70-204, Poland
| | - Dorota Rogińska
- Department of General Pathology, Pomeranian Medical University, Szczecin 70-204, Poland
| | - Patrycja Kłos
- Department of Medical Chemistry, Pomeranian Medical University, Szczecin 70-204, Poland
| | - Anna Sobuś
- Department of General Pathology, Pomeranian Medical University, Szczecin 70-204, Poland
| | - Małgorzata Adamczak
- Department of Pharmacy, School of Pharmacy, University of Oslo, Blindern, Oslo 0316, Norway
| | - Zofia Litwińska
- Department of General Pathology, Pomeranian Medical University, Szczecin 70-204, Poland
| | - Anna Machalińska
- First Department of Ophthalmology, Pomeranian Medical University, Szczecin 70-204, Poland
| | - Bogusław Machaliński
- Department of General Pathology, Pomeranian Medical University, Szczecin 70-204, Poland
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8
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Wasilewska M, Adamczyk Z, Pomorska A, Nattich-Rak M, Sadowska M. Human Serum Albumin Adsorption Kinetics on Silica: Influence of Protein Solution Stability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2639-2648. [PMID: 30673280 DOI: 10.1021/acs.langmuir.8b03266] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Adsorption kinetics of human serum albumin (HSA) on silica substrates was studied using optical waveguide lightmode spectroscopy (OWLS) and quartz microbalance (QCM) techniques. Measurements were performed at pH 3.5, 5.6, and 7.4 for various bulk suspension concentrations and ionic strengths. The diffusion coefficient measurements showed that for pH 3.5 the HSA molecules are stable for NaCl concentrations from 10-3 to 0.15 M. This allowed us to precisely determine the mass transfer rate coefficients for the OWLS and QCM cells. The experimental data were adequately interpreted in terms of a hybrid random sequential adsorption model. The OWLS maximum coverage of HSA at pH 3.5, which is equal to 1.3 mg m-2, agrees with the QCM result and with previous results derived from streaming potential measurements. Thus, the results obtained at pH 3.5 served as reference data for the analysis of adsorption kinetics at higher pHs. In this way, it was confirmed that the adsorption kinetics of HSA molecules at pH 5.6 and 7.4 was considerably slower than at pH 3.5. This effect was attributed to aggregation of HSA solutions and interpreted in terms of a theoretical model combining the Smoluchowski aggregation theory with the convective diffusion mass transfer theory. New analytical equations were derived that can be used for the interpretation of other protein adsorption from unstable solutions.
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Affiliation(s)
- Monika Wasilewska
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Science , Niezapominajek 8 , 30-239 Cracow , Poland
| | - Zbigniew Adamczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Science , Niezapominajek 8 , 30-239 Cracow , Poland
| | - Agata Pomorska
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Science , Niezapominajek 8 , 30-239 Cracow , Poland
| | - Małgorzata Nattich-Rak
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Science , Niezapominajek 8 , 30-239 Cracow , Poland
| | - Marta Sadowska
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Science , Niezapominajek 8 , 30-239 Cracow , Poland
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9
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Hristova SH, Zhivkov AM. Isoelectric point of free and adsorbed cytochrome c determined by various methods. Colloids Surf B Biointerfaces 2019; 174:87-94. [DOI: 10.1016/j.colsurfb.2018.10.080] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 10/18/2018] [Accepted: 10/31/2018] [Indexed: 01/09/2023]
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10
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Xie Y, Huang Y, Tang D, Cui H, Yang L, Cao H, Yun W. Sensitive colorimetric detection for lysozyme based on the capture of a fixed thiol-aptamer on gold nanoparticles. NEW J CHEM 2019. [DOI: 10.1039/c9nj00016j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A thiol-aptamer immobilized on gold nanoparticles enhances the stability of probes for detecting lysozyme with a LOD of 0.054 nM.
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Affiliation(s)
- Yuanyang Xie
- Chongqing Institute of Green and Intelligent Technology
- Chinese Academy of Sciences
- Chongqing
- China
- University of Chinese Academy of Science
| | - Yu Huang
- Chongqing Institute of Green and Intelligent Technology
- Chinese Academy of Sciences
- Chongqing
- China
| | - Dongyun Tang
- Chongqing Institute of Green and Intelligent Technology
- Chinese Academy of Sciences
- Chongqing
- China
| | - Hongliang Cui
- University of Chinese Academy of Science
- Beijing
- China
| | - Lizhu Yang
- School of Pharmaceutical Sciences
- Wenzhou Medical University
- Wenzhou
- Zhejiang
- China
| | - Haiyan Cao
- School of Chemistry and Chemical Engineering
- Yangtze Normal University
- Chongqing
- China
| | - Wen Yun
- Chongqing Key Laboratory of Catalysis and Functional Organic Molecules
- College of Environment and Resources
- Chongqing Technology and Business University
- Chongqing
- China
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11
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Pomorska A, Adamczyk Z, Nattich-Rak M, Sadowska M. Kinetics of human serum albumin adsorption at silica sensor: Unveiling dynamic hydration function. Colloids Surf B Biointerfaces 2018; 167:377-384. [PMID: 29705664 DOI: 10.1016/j.colsurfb.2018.04.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 02/21/2018] [Accepted: 04/04/2018] [Indexed: 11/18/2022]
Abstract
Adsorption kinetics of human serum albumin (HSA) at a silica substrate was studied using the QCM-D and AFM methods. Measurements were performed at pH 3.5 for various bulk suspension concentrations and ionic strengths. The QCM experimental data were compared with the dry coverage of HSA derived from AFM and from the solution of the mass transfer equation. In this way, the dynamic hydration functions and water factors of HSA monolayers were quantitatively evaluated as a function of dry coverage for various ionic strengths. Using the hydration functions, the HSA adsorption runs derived from QCM-D measurements were converted to the dry coverage vs. the time relationships. In this way, the maximum coverage of irreversibly bound HSA molecules was determined. It was equal to 0.35 and 1.4 mg m-2 for NaCl concentration of 0.001 and 0.15 M, respectively. These results agree with previous experimental data derived by streaming potential measurements for mica and with theoretical modeling. Therefore, the side-on mechanism of HSA adsorption at silica sensor at pH 3.5 was confirmed. Also, a quantitative analysis of the desorption runs allowed one to calculate the binding energy of the reversibly bound HSA fraction. Beside significance to basic science, these results enable to develop a robust technique of preparing HSA monolayers at silica sensor of well-controlled coverage and molecule orientation.
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Affiliation(s)
- Agata Pomorska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Cracow, Poland
| | - Zbigniew Adamczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Cracow, Poland.
| | - Małgorzata Nattich-Rak
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Cracow, Poland
| | - Marta Sadowska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Cracow, Poland
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12
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Adamczyk Z, Nattich-Rak M, Dąbkowska M, Kujda-Kruk M. Albumin adsorption at solid substrates: A quest for a unified approach. J Colloid Interface Sci 2018; 514:769-790. [DOI: 10.1016/j.jcis.2017.11.083] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 11/27/2017] [Accepted: 11/29/2017] [Indexed: 12/20/2022]
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13
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Nattich-Rak M, Sadowska M, Adamczyk Z, Cieśla M, Kąkol M. Formation mechanism of human serum albumin monolayers on positively charged polymer microparticles. Colloids Surf B Biointerfaces 2017; 159:929-936. [DOI: 10.1016/j.colsurfb.2017.08.051] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 08/21/2017] [Accepted: 08/26/2017] [Indexed: 01/04/2023]
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14
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Dąbkowska M, Adamczak M, Barbasz J, Cieśla M, Machaliński B. Adsorption/Desorption Transition of Recombinant Human Neurotrophin 4: Physicochemical Characterization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9548-9557. [PMID: 28825842 DOI: 10.1021/acs.langmuir.7b00909] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Bulk physicochemical properties of neurotrophin 4 (NT-4) in electrolyte solutions and its adsorption/desorption on/from mica surfaces have been studied using dynamic light scattering (DLS), microelectrophoresis, a solution depletion technique (enzyme-linked immunosorbent assay, ELISA), and AFM imaging. Our study presents a determination of the diffusion coefficient, hydrodynamic diameters, electrophoretic mobility, and isoelectric point of the NT-4 under various ionic strength and pH conditions. The size of the NT-4 homodimer for an ionic strength of 0.015 M was substantially independent of pH and equal to 5.1 nm. It has been found that the number of electrokinetic charges per NT-4 molecule was equal to zero for all studied ionic strengths at pH 8.1, which was identified as the isoelectric point (iep). The protein adsorption/desorption on/from mica surfaces was examined as a function of ionic strength and pH. The kinetics of neurotrophin adsorption/desorption were evaluated at pH 3.5, 7.4, and 11 by direct AFM imaging and the ELISA technique. A monotonic increase in the maximum coverage of adsorbed NT-4 molecules with ionic strength (up to 5.5 mg/m2) was observed at pH 3.5. These results were interpreted in terms of the theoretical model postulating an irreversible adsorption of the protein governed by the random sequential adsorption (RSA). Our measurements revealed a significant role of ionic strength, pH, and electrolyte composition in the lateral electrostatic interactions among differently charged NT-4 molecules. The transition between adsorption/desorption processes is found for the region of high pH and low surface concentration of adsorbed neurotrophin molecules at constant ionic strength. Additionally, results presented in this work show that the adsorption behavior of neurotrophin molecules may be governed by intrasolvent electrostatic interactions yielding an aggregation process. Understanding polyvalent neurotrophin interactions may have an impact on the reversibility/irreversibility of adsorption, and hence they might be useful for obtaining well-ordered protein layers, targeting the future development of drug delivery systems for treating neurodegenerative diseases.
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Affiliation(s)
| | - Małgorzata Adamczak
- Department of Pharmacy, School of Pharmacy, University of Oslo , P.O. Box 1068, Blindern, 0316 Oslo, Norway
| | - Jakub Barbasz
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences , Niezapominajek 8, 30-239 Kraków, Poland
| | - Michał Cieśla
- M. Smoluchowski Institute of Physics, Jagiellonian University , Łojasiewicza 11, 30-348 Kraków, Poland
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