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Zhu X, Wang K, Liu Z, Wang J, Wu E, Yu W, Zhu X, Chu C, Chen B. Probing Molecular-Level Dynamic Interactions of Dissolved Organic Matter with Iron Oxyhydroxide via a Coupled Microfluidic Reactor and an Online High-Resolution Mass Spectrometry System. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:2981-2991. [PMID: 36749182 DOI: 10.1021/acs.est.2c06816] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The interactions between dissolved organic matter (DOM) and iron (Fe) oxyhydroxide are crucial in regulating the biogeochemical cycling of nutrients and elements, including the preservation of carbon in soils. The mechanisms of DOM molecular assembly on mineral surfaces have been extensively studied at the mesoscale with equilibrium experiments, yet the molecular-level evolution of the DOM-mineral interface under dynamic interaction conditions is not fully understood. Here, we designed a microfluidic reactor coupled with an online solid phase extraction (SPE)-LC-QTOF MS system to continually monitor the changes in DOM composition during flowing contact with Fe oxyhydroxide at circumneutral pH, which simulates soil minerals interacting with constant DOM input. Time-series UV-visible absorption spectra and mass spectrometry data showed that after aromatic DOM moieties were first preferentially sequestered by the pristine Fe oxyhydroxide surface, the adsorption of nonaromatic DOM molecules with greater hydrophobicity, lower acidity, and lower molecular weights (<400) from new DOM solutions was favored. This is accompanied by a transition from mineral surface chemistry-dominated adsorption to organic-organic interaction-dominated adsorption. These findings provide direct molecular-level evidence to the zonal model of DOM assembly on mineral surfaces by taking the dynamics of interfacial interactions into consideration. This study also shows that coupled microfluidics and online high-resolution mass spectrometry (HRMS) system is a promising experimental platform for probing microscale environmental carbon dynamics by integrating in situ reactions, sample pretreatment, and automatic analysis.
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Affiliation(s)
- Xiangyu Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
| | - Kun Wang
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
| | - Zhengzheng Liu
- Zhejiang Key Laboratory of Ecological and Environmental Monitoring, Forewarning and Quality Control, Zhejiang Ecological and Environmental Monitoring Center, Hangzhou, Zhejiang 310012, China
| | - Jing Wang
- Zhejiang Key Laboratory of Ecological and Environmental Monitoring, Forewarning and Quality Control, Zhejiang Ecological and Environmental Monitoring Center, Hangzhou, Zhejiang 310012, China
| | - Enhui Wu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
| | - Wentao Yu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
| | - Xiaoying Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
| | - Chiheng Chu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
| | - Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China
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Comparison of Physical Adsorption and Covalent Coupling Methods for Surface Density-Dependent Orientation of Antibody on Silicon. Molecules 2022; 27:molecules27123672. [PMID: 35744796 PMCID: PMC9228713 DOI: 10.3390/molecules27123672] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/24/2022] [Accepted: 06/03/2022] [Indexed: 11/27/2022] Open
Abstract
The orientation of antibodies, employed as capture molecules on biosensors, determines biorecognition efficiency and bioassay performance. In a previous publication we demonstrated for antibodies attached covalently to silicon that an increase in their surface amount Γ, evaluated with ellipsometry, induces changes in their orientation, which is traced directly using Time-of-Flight Secondary Ion Mass Spectroscopy combined with Principal Component Analysis. Here, we extend the above studies to antibodies adsorbed physically on a 3-aminopropyltriethoxysilane (APTES) monolayer. Antibodies physisorbed on APTES (0 ≤ Γ ≤ 3.5 mg/m2) reveal the Γ ranges for flat-on, side-on, and vertical orientation consistent with random molecular packing. The relation between orientation and Γ is juxtaposed for silicon functionalized with APTES, APTES modified with glutaraldehyde (APTES/GA) and N-hydroxysuccinimide-silane (NHS-silane). Antibody reorientation occurs at lower Γ values when physisorption (APTES) is involved rather than chemisorption (APTES/GA, NHS-silane). At high Γ values, comparable proportions of molecules adapting head-on and tail-on vertical alignment are concluded for APTES and the NHS-silane monolayer, and they are related to intermolecular dipole–dipole interactions. Intermolecular forces seem to be less decisive than covalent binding for antibodies on the APTES/GA surface, with dominant head-on orientation. Independently, the impact of glutaraldehyde activation of APTES on vertical orientation is confirmed by separate TOF-SIMS measurements.
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Jing W, Gao W, Li Z, Peng M, Han F, Wei Z, Yang Z, Jiang Z. Regulation of the Volume Flow Rate of Aqueous Methyl Blue Solution and the Wettability of CuO/ZnO Nanorods to Improve the Photodegradation Performance of Related Microfluidic Reactors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7890-7906. [PMID: 34152754 DOI: 10.1021/acs.langmuir.1c00407] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Six CuO/ZnO nanorod (CuO/ZnONR)-based microfluidic reactors were constructed for different UV irradiation durations, with which an aqueous methylene blue (MB) solution was photodegraded at varied volume flow rate Q. Via numerical and experimental routes, the effects of the Q on the kinetic adsorption rate constant Ka and the initial rate constant KA of the CuO/ZnONR-based microfluidic reactors were discussed. Moreover, a reverse contacting angle (CA) trend of CuO/ZnONRs to the reaction constant K curve of corresponding CuO/ZnONR-based microfluidic reactor suggested that the CA of CuO/ZnONRs was another key influencing factor that affected greatly the photodegradation performance of the microfluidic reactors. The Q of the aqueous MB solution and the UV irradiation duration for the photodeposition of CuO/ZnONRs were optimized to be 125 μL/min and 1.0 h, the K of the CuO/ZnONR-based microfluidic reactors reached 4.84 min-1, and the related ΔKA/K was less than 6%. Similarly, these methods and results can be employed not only to enhance the mass transport and adsorption of specific species within other nanostructured matrix material-coated microchannels but also to enlarge the actual contacting surface areas between these microchannels and the related solution, which further improve the performance of other nanostructured catalyst-based microfluidic reactors, rGO microfluidic voltage generation, and a GOx/AuNW enzymatic glucose microfluidic sensor.
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Affiliation(s)
- Weixuan Jing
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction at Chongqing Technology and Business University, Chongqing 400067, P. R. China
| | - Weizhuo Gao
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Zehao Li
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Mengli Peng
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Feng Han
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Zhengying Wei
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Zhaochu Yang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction at Chongqing Technology and Business University, Chongqing 400067, P. R. China
| | - Zhuangde Jiang
- State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, Xi'an 710049, P. R. China
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Huangfu C, Dong Y, Ji X, Wu N, Lu X. Mechanistic Study of Protein Adsorption on Mesoporous TiO 2 in Aqueous Buffer Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11037-11047. [PMID: 31378070 DOI: 10.1021/acs.langmuir.9b01354] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Protein adsorption is of fundamental importance for bioseparation engineering applications. In this work, a series of mesoporous TiO2 with various geometric structures and different aqueous buffer solutions were prepared as platforms to investigate the effects of the surface geometry and ionic strength on the protein adsorptive behavior. The surface geometry of the TiO2 was found to play a dominant role in the protein adsorption capacity when the ionic strength of buffer solutions is very low. With the increase in ionic strength, the effect of the geometric structure on the protein adsorption capacity reduced greatly. The change of ionic strength has the highest significant effect on the mesoporous TiO2 with large pore size compared with that with small pore size. The interaction between the protein and TiO2 measured with atomic force microscopy further demonstrated that the adhesion force induced by the surface geometry reduced with the increase in the ionic strength. These findings were used to guide the detection of the retention behavior of protein by high-performance liquid chromatography, providing a step forward toward understanding the protein adsorption for predicting and controlling the chromatographic separation of proteins.
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Affiliation(s)
- Changan Huangfu
- State Key Laboratory of Materials-Oriented and Chemical Engineering , Nanjing Tech University , Nanjing 210009 , China
| | - Yihui Dong
- State Key Laboratory of Materials-Oriented and Chemical Engineering , Nanjing Tech University , Nanjing 210009 , China
| | - Xiaoyan Ji
- Energy Engineering, Division of Energy Science , Luleå University of Technology , 97187 Luleå , Sweden
| | - Na Wu
- State Key Laboratory of Materials-Oriented and Chemical Engineering , Nanjing Tech University , Nanjing 210009 , China
| | - Xiaohua Lu
- State Key Laboratory of Materials-Oriented and Chemical Engineering , Nanjing Tech University , Nanjing 210009 , China
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Coglitore D, Janot JM, Balme S. Protein at liquid solid interfaces: Toward a new paradigm to change the approach to design hybrid protein/solid-state materials. Adv Colloid Interface Sci 2019; 270:278-292. [PMID: 31306853 DOI: 10.1016/j.cis.2019.07.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 10/26/2022]
Abstract
This review gives an overview of protein adsorption at solid/liquid interface. Compared to the other ones, we have focus on three main questions with the point of view of the protein. The first question is related to the kinetic and especially the using of Langmuir model to describe the protein adsorption. The second question is about the concept of hard and soft protein. In this part, we report the protein structural modification induced by adsorption regarding their intrinsic structure. This allows formulating of a new concept to classify the protein to predict their behavior at solid/liquid interface. The last question is related to the protein corona. We give an overview about the soft/hard corona and attempt to make correlation with the concept of hard/soft protein.
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Mathematical modeling approaches to describe the dynamics of protein adsorption at solid interfaces. Colloids Surf B Biointerfaces 2018; 162:370-379. [DOI: 10.1016/j.colsurfb.2017.12.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/21/2017] [Accepted: 12/06/2017] [Indexed: 11/22/2022]
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7
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Kujda M, Adamczyk Z, Zapotoczny S, Kowalska E. Electrokinetic characteristics of HSA dimer and its monolayers at mica. Colloids Surf B Biointerfaces 2015; 136:1207-14. [DOI: 10.1016/j.colsurfb.2015.11.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 09/29/2015] [Accepted: 11/02/2015] [Indexed: 11/28/2022]
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8
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Choudhury S, Batabyal S, Mondal PK, Singh P, Lemmens P, Pal SK. Direct Observation of Kinetic Pathways of Biomolecular Recognition. Chemistry 2015; 21:16172-7. [DOI: 10.1002/chem.201501616] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Susobhan Choudhury
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
| | - Subrata Batabyal
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
| | - Prasanna Kumar Mondal
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
| | - Priya Singh
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
| | - Peter Lemmens
- Institute for Condensed Matter Physics and Laboratory for Emergent, Nanometrology, TU Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig (Germany)
| | - Samir Kumar Pal
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
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Kujda M, Adamczyk Z, Sofińska MMK. Recombinant albumin adsorption on mica studied by AFM and streaming potential measurements. Colloids Surf B Biointerfaces 2015; 127:192-9. [DOI: 10.1016/j.colsurfb.2015.01.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Revised: 12/20/2014] [Accepted: 01/20/2015] [Indexed: 11/25/2022]
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10
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Kastantin M, Langdon BB, Schwartz DK. A bottom-up approach to understanding protein layer formation at solid-liquid interfaces. Adv Colloid Interface Sci 2014; 207:240-52. [PMID: 24484895 PMCID: PMC4028386 DOI: 10.1016/j.cis.2013.12.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 12/05/2013] [Accepted: 12/17/2013] [Indexed: 11/25/2022]
Abstract
A common goal across different fields (e.g. separations, biosensors, biomaterials, pharmaceuticals) is to understand how protein behavior at solid-liquid interfaces is affected by environmental conditions. Temperature, pH, ionic strength, and the chemical and physical properties of the solid surface, among many factors, can control microscopic protein dynamics (e.g. adsorption, desorption, diffusion, aggregation) that contribute to macroscopic properties like time-dependent total protein surface coverage and protein structure. These relationships are typically studied through a top-down approach in which macroscopic observations are explained using analytical models that are based upon reasonable, but not universally true, simplifying assumptions about microscopic protein dynamics. Conclusions connecting microscopic dynamics to environmental factors can be heavily biased by potentially incorrect assumptions. In contrast, more complicated models avoid several of the common assumptions but require many parameters that have overlapping effects on predictions of macroscopic, average protein properties. Consequently, these models are poorly suited for the top-down approach. Because the sophistication incorporated into these models may ultimately prove essential to understanding interfacial protein behavior, this article proposes a bottom-up approach in which direct observations of microscopic protein dynamics specify parameters in complicated models, which then generate macroscopic predictions to compare with experiment. In this framework, single-molecule tracking has proven capable of making direct measurements of microscopic protein dynamics, but must be complemented by modeling to combine and extrapolate many independent microscopic observations to the macro-scale. The bottom-up approach is expected to better connect environmental factors to macroscopic protein behavior, thereby guiding rational choices that promote desirable protein behaviors.
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Affiliation(s)
- Mark Kastantin
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States
| | - Blake B Langdon
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States
| | - Daniel K Schwartz
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States.
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11
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Avidin adsorption on silicone elastomer: Effects of stretching and polyelectrolyte coatings. Colloids Surf B Biointerfaces 2013; 108:260-5. [DOI: 10.1016/j.colsurfb.2013.02.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 01/26/2013] [Accepted: 02/06/2013] [Indexed: 11/23/2022]
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12
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Filippov AN, Khanukaeva DY, Vasin SI, Sobolev VD, Starov VM. Liquid flow inside a cylindrical capillary with walls covered with a porous layer (Gel). COLLOID JOURNAL 2013. [DOI: 10.1134/s1061933x13020051] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Sobolev VD, Sergeeva IP, Kiseleva OA. Determination of the surface potential for adsorption layers of polyelectrolytes by the streaming potential method. COLLOID JOURNAL 2012. [DOI: 10.1134/s1061933x12060130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Dąbkowska M, Adamczyk Z. Human serum albumin monolayers on mica: electrokinetic characteristics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:15663-15673. [PMID: 23057706 DOI: 10.1021/la3036677] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Adsorption of human serum albumin (HSA) on mica from 0.15 M NaCl solutions and various pH values was studied using in situ streaming potential measurements, AFM imaging, and XPS. The results obtained by the streaming potential were consistent with AFM measurements and theoretical predictions based on the random sequential adsorption model. This allowed one to determine both the kinetics of adsorption and the maximum coverage of HSA as a function of pH. At pH 3.5, the maximum coverage of HSA was 0.45 (which corresponds to 1.4 mg m(-2) neglecting hydration). This decreased monotonically with the increase in pH, attaining 0.30 (pH 5.1) and 0.25 (pH 7.4). At pH >10.5, the adsorption of HSA on mica was negligible. Further experimental studies performed for HSA monolayers of well-controlled coverage revealed their stability against pH cycling. It was found in these experiments that at pH <4 and >8 the electrokinetic properties of HSA monolayers approached the reference data pertinent to the bulk. However, for an intermediate pH range, deviations from the bulk reference data were observed, suggesting a dipolar (heterogeneous) charge distribution over adsorbed HSA molecules. This caused a slight shift in the isoelectric point of the monolayer determined to be 4.7 compared to the bulk value of 5.1. However, for the HSA coverage below 0.2, the effect of the substrate was significant, making the zeta potential more negative and shifting the apparent isoelectric point to more acidic values. It was suggested that these results obtained for planar and smooth interfaces could be used as reference data for interpreting albumin adsorption on colloid carrier particles.
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Affiliation(s)
- Maria Dąbkowska
- J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Cracow, Poland
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15
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Dąbkowska M, Adamczyk Z, Kujda M. Mechanism of HSA adsorption on mica determined by streaming potential, AFM and XPS measurements. Colloids Surf B Biointerfaces 2012; 101:442-9. [PMID: 23010053 DOI: 10.1016/j.colsurfb.2012.07.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 06/05/2012] [Accepted: 07/09/2012] [Indexed: 10/28/2022]
Abstract
Adsorption of human serum albumin (HSA) on mica at pH 3.5 (0.15M NaCl) was studied using in situ streaming potential measurements, AFM imaging and XPS. Results obtained by streaming potential were consistent with AFM measurements and theoretical predictions based on the random sequential adsorption model. These results in combination with complementary data derived from XPS allowed one to determine both the kinetics of adsorption and the maximum coverage of irreversibly bound HSA, which was close to 1.6 mg m(-2) (dimensionless coverage 0.45). It was concluded that HSA adsorption on mica at pH 3.5 occurred under side-on, electrostatically controlled mechanisms with no tendency to multilayer formation. Such irreversible bound HSA monolayers of well-defined coverage can find applications for performing efficient immunological tests, designing biomaterials surfaces and biosensors.
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Affiliation(s)
- Maria Dąbkowska
- J. Haber Institute of Catalysis and Surface Chemistry Polish Academy of Science, Cracow, Poland.
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16
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Adamczyk Z, Nattich M, Wasilewska M, Zaucha M. Colloid particle and protein deposition - electrokinetic studies. Adv Colloid Interface Sci 2011; 168:3-28. [PMID: 21621181 DOI: 10.1016/j.cis.2011.04.002] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 04/15/2011] [Accepted: 04/18/2011] [Indexed: 11/30/2022]
Abstract
Recent developments in the electrokinetic determination of particle, polyelectrolyte and protein deposition at solid/electrolyte interfaces, are reviewed. In the first section basic theoretical results are discussed enabling a quantitative interpretation of the streaming current/potential and microelectrophoretic measurements. Experimental results are presented, pertinent to electrokinetic characteristics of simple (homogeneous) surfaces such as mica, silica and various polymeric surfaces used in protein studies. The influence of the ionic strength, background electrolyte composition and pH is discussed, and the effective (electrokientic) charge of these interfaces is evaluated. In the next section, experimental data obtained by streaming potential measurements for colloid particle mono- and bilayers are presented and interpreted successfully in terms of available theoretical approaches. These results, obtained for model systems of monodisperse colloid particles are used as reference data for discussion of more complicated experiments performed for polyelectrolyte and protein covered surfaces. Results are discussed, obtained for cationic polyelectrolytes (PEI, PAH) and fibrinogen adsorbing on mica, interpreted quantitatively in terms of the theoretical approach postulating a heterogeneous 3D charge distribution. The Gouy-Chapman model, based on the continuous charge distribution proved inadequate. Interesting experimental data are also discussed, obtained by electrophoretic methods in the case of protein adsorption on colloid latex particles. In the last section, supplementary results on particle deposition on heterogeneous surfaces produced by controlled protein adsorption are discussed. Quantitative relationships between the amount of adsorbed protein, zeta potential of the interface and the particle coverage are specified. Possibility of evaluating the heterogeneity of protein charge distribution is pointed out. The anomalous deposition of colloid particles on protein molecules bearing the same sign of zeta potential, which contradicts classical DLVO theory, is interpreted in terms of the fluctuation theory. It is concluded that theoretical and experimental results obtained for model colloid systems and flat interfaces can be effectively used for interpretation of protein adsorption phenomena, studied by electrophoresis. In this way the universality of electrokinetic phenomena is underlined.
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Affiliation(s)
- Z Adamczyk
- J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Cracow, Poland.
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17
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Ionic strength effect in HSA adsorption on mica determined by streaming potential measurements. J Colloid Interface Sci 2011; 366:105-113. [PMID: 21999960 DOI: 10.1016/j.jcis.2011.09.030] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Revised: 08/02/2011] [Accepted: 09/13/2011] [Indexed: 11/24/2022]
Abstract
Adsorption and desorption of human serum albumin (HSA) from aqueous solutions on mica were studied using AFM and in situ streaming potential measurements. A quantitative interpretation of these experiments was achieved in terms of the theoretical model postulating a 3D adsorption of HSA molecules as discrete particles. These measurements, performed for various ionic strength, allowed one to determine the coverage of HSA as a function of the zeta potential of mica. This allowed one to determine the amount of irreversibly bound HSA as a function of the ionic strength. It was found that the coverage of irreversibly adsorbed HSA increased from 0.52 mg m(-2) for I=1.3×10(-3) M to 1.6 mg m(-2) for I=0.15M (pH=3.5). The significant role of ionic strength was attributed to the lateral electrostatic repulsion among adsorbed HSA molecules, positively charged at this pH value. This was quantitatively interpreted in terms of the effective hard particle concept previously used for colloid particles. The experimental results confirmed that monolayers of irreversibly bound HSA of a well-controlled coverage can be produced by adjusting the ionic strength of the suspension.
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18
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Zaucha M, Adamczyk Z, Barbasz J. Zeta potential of particle bilayers on mica: A streaming potential study. J Colloid Interface Sci 2011; 360:195-203. [DOI: 10.1016/j.jcis.2011.02.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 02/08/2011] [Accepted: 02/09/2011] [Indexed: 10/18/2022]
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19
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Ino K, Udagawa I, Iwabata K, Takakusagi Y, Kubota M, Kurosaka K, Arai K, Seki Y, Nogawa M, Tsunoda T, Mizukami F, Taguchi H, Sakaguchi K. Heterogeneous nucleation of protein crystals on fluorinated layered silicate. PLoS One 2011; 6:e22582. [PMID: 21818343 PMCID: PMC3144907 DOI: 10.1371/journal.pone.0022582] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 06/24/2011] [Indexed: 11/22/2022] Open
Abstract
Here, we describe an improved system for protein crystallization based on heterogeneous nucleation using fluorinated layered silicate. In addition, we also investigated the mechanism of nucleation on the silicate surface. Crystallization of lysozyme using silicates with different chemical compositions indicated that fluorosilicates promoted nucleation whereas the silicates without fluorine did not. The use of synthesized saponites for lysozyme crystallization confirmed that the substitution of hydroxyl groups contained in the lamellae structure for fluorine atoms is responsible for the nucleation-inducing property of the nucleant. Crystallization of twelve proteins with a wide range of pI values revealed that the nucleation promoting effect of the saponites tended to increase with increased substitution rate. Furthermore, the saponite with the highest fluorine content promoted nucleation in all the test proteins regardless of their overall net charge. Adsorption experiments of proteins on the saponites confirmed that the density of adsorbed molecules increased according to the substitution rate, thereby explaining the heterogeneous nucleation on the silicate surface.
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Affiliation(s)
- Keita Ino
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Itsumi Udagawa
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Kazuki Iwabata
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Yoichi Takakusagi
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Munehiro Kubota
- Iwaki Lab, Kunimine Industries Co., Ltd., Joban Iwaki, Fukushima, Japan
| | - Keiichi Kurosaka
- Iwaki Lab, Kunimine Industries Co., Ltd., Joban Iwaki, Fukushima, Japan
| | - Kazuhito Arai
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Yasutaka Seki
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Masaya Nogawa
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Tatsuo Tsunoda
- Research Center for Compact Chemical System, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
| | - Fujio Mizukami
- Research Center for Compact Chemical System, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
| | - Hayao Taguchi
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
| | - Kengo Sakaguchi
- Department of Applied Biological Science, Tokyo University of Science, Noda, Chiba, Japan
- * E-mail:
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Saeki K, Kunito T, Sakai M. Effect of Tris-HCl buffer on DNA adsorption by a variety of soil constituents. Microbes Environ 2011; 26:88-91. [PMID: 21487209 DOI: 10.1264/jsme2.me10172] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We investigated the effect of tris(hydroxymethyl)aminomethane hydrochloride (Tris-HCl) buffer (pH 7.0) as a bulk solution on the adsorption of DNA by gibbsite, goethite, montmorillonite, kaolinite, synthetic and natural allophanes, two humic acids and two andosols. The natural allophane, gibbsite, kaolinite and an andosol adsorbed significantly more DNA in a 0.1 M Tris-HCl buffer than in a 0.1 M NaCl solution (t-test, P<0.005). In contrast, montmorillonite adsorbed significantly less DNA in the Tris-HCl than NaCl solution (P<0.05). Care should be taken when using Tris-HCl in studies on the adsorption of extracellular DNA molecules by soil particles.
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Affiliation(s)
- Kazutoshi Saeki
- Biotron Institute, Kyushu University, 6–10–1 Hakozaki, Higashi-ku, Fukuoka 812–8581, Japan
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21
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Deposition of colloid particles on protein layers: Fibrinogen on mica. J Colloid Interface Sci 2011; 356:454-64. [DOI: 10.1016/j.jcis.2011.01.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Revised: 12/30/2010] [Accepted: 01/03/2011] [Indexed: 11/17/2022]
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22
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Understanding protein adsorption phenomena at solid surfaces. Adv Colloid Interface Sci 2011; 162:87-106. [PMID: 21295764 DOI: 10.1016/j.cis.2010.12.007] [Citation(s) in RCA: 992] [Impact Index Per Article: 76.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 12/21/2010] [Accepted: 12/28/2010] [Indexed: 11/21/2022]
Abstract
Protein adsorption at solid surfaces plays a key role in many natural processes and has therefore promoted a widespread interest in many research areas. Despite considerable progress in this field there are still widely differing and even contradictive opinions on how to explain the frequently observed phenomena such as structural rearrangements, cooperative adsorption, overshooting adsorption kinetics, or protein aggregation. In this review recent achievements and new perspectives on protein adsorption processes are comprehensively discussed. The main focus is put on commonly postulated mechanistic aspects and their translation into mathematical concepts and model descriptions. Relevant experimental and computational strategies to practically approach the field of protein adsorption mechanisms and their impact on current successes are outlined.
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Wasilewska M, Adamczyk Z. Fibrinogen adsorption on mica studied by AFM and in situ streaming potential measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:686-96. [PMID: 21155546 DOI: 10.1021/la102931a] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Adsorption of fibrinogen from aqueous solutions on mica was studied using AFM and in situ streaming potential measurements. In the first stage, bulk physicochemical properties of fibrinogen and the mica substrate were characterized for various ionic strength and pH. The zeta potential and number of uncompensated (electrokinetic) charges on the protein surfaces were determined from microelectrophoretic measurements. Analogously, using streaming potential measurements, the electrokinetic charge density of mica was determined for pH range 3-10 and the NaCl background electrolyte concentration of 10(-3) and 10(-2) M. Next, the kinetics of fibrinogen adsorption at pH 3.5 and 7.4 in the diffusion cell was studied using a direct AFM determination of the number of molecules per unit area of the mica substrate. Then, streaming potential measurements were performed to determine the apparent zeta potential of fibrinogen-covered mica for different pH and ionic strength in terms of its surface concentration. A quantitative interpretation of these streaming potential measurements was achieved in terms of the theoretical model postulating a side-on adsorption of fibrinogen molecules as discrete particles. On the basis of these results, the maximum coverage of fibrinogen Θ close to 0.29 was predicted, in accordance with previous theoretical predictions. It was also suggested that anomalous adsorption for pH 7.4, where fibrinogen and the mica substrate were both negatively charged, can be explained in terms of a heterogeneous charge distribution on fibrinogen molecules. It was estimated that the positive charge was 12 e (for NaCl concentration of 10(-2) M and pH 7.4) compared with the net charge of fibrinogen at this pH, equal to -21 e. Results obtained in this work proved that the coverage of fibrinogen can be quantitatively determined using the streaming potential method, especially for Θ < 0.2, where other experimental methods become less accurate.
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Affiliation(s)
- Monika Wasilewska
- Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Cracow, Poland.
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24
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Campiña JM, Souza HK, Borges J, Martins A, Gonçalves MP, Silva F. Studies on the interactions between bovine β-lactoglobulin and chitosan at the solid–liquid interface. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.08.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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26
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Adamczyk Z, Zaucha M, Zembala M. Zeta potential of mica covered by colloid particles: a streaming potential study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9368-9377. [PMID: 20364856 DOI: 10.1021/la1003534] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The streaming potential of mica covered by monodisperse latex particles was measured using the parallel-plate channel, four-electrode cell. The zeta potential of latex bearing amidine charged groups was regulated by the addition of NaCl (10(-4)-10(-2) M) and MgCl(2) (10(-4)-10(-2) M) at a constant pH 5.5 and by the change in pH (4-12) at 10(-2) M NaCl. The size of the latex particles, determined by dynamic light scattering, varied between 502 and 540 nm for the above electrolyte concentration range. Mica sheets have been covered with latex particles under diffusion transport conditions. The latex coverage was regulated by the bulk suspension concentration in the channel and the deposition time. The coverage was determined, with a relative precision of 2%, by the direct enumeration of particles by optical microscopy and AFM. The streaming potential of mica was then determined for a broad range of particle coverage 0 < theta < 0.5, the particle-to-substrate zeta potential ratio zeta(p)/zeta(i), and 8.8 < kappa a < 143 (thin double-layer limit). These experimental data confirmed that the streaming potential of covered surfaces is well reflected by the theoretical approach formulated in ref 32. It was also shown experimentally that variations in the substrate streaming potential with particle coverage for theta < 0.3 and zeta(p)/zeta(i) < 0 are characterized by a large slope, which enables the precise detection of particles attached to interfaces. However, measurements at high coverage and various pH values revealed that the apparent zeta potential of covered surfaces is 1/2(1/2) smaller than the bulk zeta potential of particles (in absolute terms). This is valid for arbitrary zeta potentials of substrates and particles, including the case of negative particles on negatively charged substrates that mimics rough surfaces. Therefore, it was concluded that the streaming potential method can serve as an efficient tool for determining bulk zeta potentials of colloids and bioparticles.
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Affiliation(s)
- Zbigniew Adamczyk
- Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Cracow, Poland.
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27
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Adamczyk Z, Nattich M, Zaucha M. Electrokinetics of particle covered surfaces. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2009.10.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Janot JM, Boissière M, Thami T, Tronel-Peyroz E, Helassa N, Noinville S, Quiquampoix H, Staunton S, Déjardin P. Adsorption of Alexa-Labeled Bt Toxin on Mica, Glass, and Hydrophobized Glass: Study by Normal Scanning Confocal Fluorescence. Biomacromolecules 2010; 11:1661-6. [DOI: 10.1021/bm100313n] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jean-Marc Janot
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Michel Boissière
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Thierry Thami
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Emmanuel Tronel-Peyroz
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Nordine Helassa
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Sylvie Noinville
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Hervé Quiquampoix
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Siobhán Staunton
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Philippe Déjardin
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
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Rabe M, Verdes D, Seeger S. Understanding Cooperative Protein Adsorption Events at the Microscopic Scale: A Comparison between Experimental Data and Monte Carlo Simulations. J Phys Chem B 2010; 114:5862-9. [DOI: 10.1021/jp909601m] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael Rabe
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Dorinel Verdes
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Stefan Seeger
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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30
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The effect of adsorption kinetics on film formation of silica/PVA suspension. J Colloid Interface Sci 2010; 344:308-14. [PMID: 20096848 DOI: 10.1016/j.jcis.2009.12.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2009] [Revised: 12/22/2009] [Accepted: 12/23/2009] [Indexed: 10/20/2022]
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31
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Noinville S, Vidic J, Déjardin P. Adsorption rate dependence on convection over a large length of a sensor to get adsorption constant and solute diffusion coefficient. Colloids Surf B Biointerfaces 2010; 76:112-6. [DOI: 10.1016/j.colsurfb.2009.10.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 10/13/2009] [Accepted: 10/13/2009] [Indexed: 10/20/2022]
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32
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Demanèche S, Chapel JP, Monrozier LJ, Quiquampoix H. Dissimilar pH-dependent adsorption features of bovine serum albumin and α-chymotrypsin on mica probed by AFM. Colloids Surf B Biointerfaces 2009; 70:226-31. [DOI: 10.1016/j.colsurfb.2008.12.036] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2008] [Revised: 12/19/2008] [Accepted: 12/19/2008] [Indexed: 11/27/2022]
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33
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Rabe M, Verdes D, Zimmermann J, Seeger S. Surface Organization and Cooperativity during Nonspecific Protein Adsorption Events. J Phys Chem B 2008; 112:13971-80. [DOI: 10.1021/jp804532v] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael Rabe
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Dorinel Verdes
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jan Zimmermann
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Stefan Seeger
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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34
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Rabe M, Verdes D, Rankl M, Artus GRJ, Seeger S. A Comprehensive Study of Concepts and Phenomena of the Nonspecific Adsorption of β-Lactoglobulin. Chemphyschem 2007; 8:862-72. [PMID: 17387668 DOI: 10.1002/cphc.200600710] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We investigate nonspecific protein adsorption processes by comparing experimentally measured adsorption kinetics of beta-lactoglobulin with mathematical models. The adsorption and desorption behavior of this protein on a hydrophilic glass surface in citrate buffer (pH 3.0), monitored for a large set of different bulk concentrations (0.5x10(-8) M-1.5x10(-6) M) using a supercritical angle fluorescence (SAF) biosensor, is reported. Increasing adsorption rates and overshootings in the beginning of the adsorption are observed as well as a transition to an almost irreversibly bound state of the protein in the long term. Furthermore, rinsing experiments prove that adsorbed proteins abruptly change their desorption behavior from irreversible to reversible when a critical surface coverage theta(crit) is reached. Based on all experimental observations, a mathematical model composed of three adsorbed states differing in their surface affinity is proposed. Terms to account for lateral interactions between surface-bound proteins are included, which yield an excellent fit of the measured kinetics. For the first time, several phenomena that have been discussed in theoretical studies are confirmed by comparing experimental data with a single model.
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Affiliation(s)
- Michael Rabe
- Institute of Physical Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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35
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Balme S, Janot JM, Déjardin P, Vasina EN, Seta P. Potentialities of confocal fluorescence for investigating protein adsorption on mica and in ultrafiltration membranes. J Memb Sci 2006. [DOI: 10.1016/j.memsci.2006.07.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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36
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Vasina EN, Déjardin P, Rezaei H, Grosclaude J, Quiquampoix H. Fate of Prions in Soil: Adsorption Kinetics of Recombinant Unglycosylated Ovine Prion Protein onto Mica in Laminar Flow Conditions and Subsequent Desorption. Biomacromolecules 2005; 6:3425-32. [PMID: 16283775 DOI: 10.1021/bm050492d] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Prions can be disseminated in soils. Their interaction with soil minerals is a key factor for the assessment of risks associated with the transport of their infectivity. We did not examine here the infectivity itself but the adsorption kinetics of an ovine recombinant prion protein (ovine PrPrec), as a noninfectious model protein, on muscovite mica, a phyllosilicate with surface properties analogous to soil clays, in conditions of laminar flow through a channel. The protein was labeled with (125)I, and its adsorption examined between pH 4.0 and 9.0. At wall shear rate 100 s(-1), we found the process to be controlled mainly by transport at the beginning of the adsorption process. Additional experiments at 1000 s(-1) (pH 5 and 6) determined that the diffusion coefficient was in accordance with the hydrodynamic radius measured by size exclusion chromatography. The pseudo-plateau of the interfacial concentration with time was compatible with more than a monolayer and suggests the presence of aggregates. Desorption was not observed in the presence of buffer between pH 4 and 9 and sheep plasma, while the addition of alkaline detergent or 10(-1) M NaOH allowed an almost complete removal from the interface. The ensemble of results suggests that the largely irreversible adsorption of the ovine PrPrec onto mica is mainly due to electrostatic attraction between the protein and the highly negatively charged mica surface. Possible consequences for the mode of dissemination of prion proteins in soils are indicated.
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Affiliation(s)
- Elena N Vasina
- European Membrane Institute, UMR 5635 (CNRS, ENSCM, UMII), Université Montpellier II, CC047, 2 Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France
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37
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Kim HJ, Lee K, Kumar S, Kim J. Dynamic sequential layer-by-layer deposition method for fast and region-selective multilayer thin film fabrication. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:8532-8. [PMID: 16114968 DOI: 10.1021/la0511182] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We present a newly devised technique, the dynamic layer-by-layer (LbL) deposition method, that is designed to take advantage of the LbL deposition method and fluidic devices. Polyelectrolyte solutions are sequentially injected through the fluidic LbL deposition device to quickly build well-defined multilayer films on a selected region with a linear increase in the material deposited. Multilayer film fabrication by this new method on a specific region was proven to be fast and effective. The effects on film quality of the processing parameters such as concentration of polyelectrolytes, flow rate, and contact time were investigated. A half-tethered self-standing film on a substrate was fabricated to demonstrate the effectiveness and the region-selective deposition capability of the devised dynamic LbL deposition method.
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Affiliation(s)
- Hyong-Jun Kim
- Department of Materials Science and Engineering, Chemical Engineering, Macromolecular Science and Engineering, and Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
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38
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Déjardin P, Vasina EN, Berezkin VV, Sobolev VD, Volkov VI. Streaming potential in cylindrical pores of poly(ethylene terephthalate) track-etched membranes: variation of apparent zeta potential with pore radius. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:4680-5. [PMID: 16032889 DOI: 10.1021/la046913e] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Streaming potential variation with pressure measured through poly(ethylene terephthalate) track-etched membranes of different pore sizes led to the determination of an apparent interfacial potential zetaa in the presence of 10-2 M KCl. The variation of zetaa with the pore radius r0 is interpreted by (i) the electric double layer overlap effect and (ii) the presence of a conductive gel layer. We propose a method which integrates both effects by assuming a simple model for the conductive gel at the pore wall. We observed the following three domains of pore size: (i) r0 > 70 nm, where surface effects are negligible; (ii) approximately 17 nm < r0 < 70 nm, where the pore/solution interface could be described as a conductive gel of thickness around 1 nm; (iii) r0 < approximately 17 nm, which corresponds to the region strongly damaged by the ion beam and is not analyzed here. The first one (zeta = -36.2 mV) corresponds to the raw material when etching has completely removed the ion beam predamaged region, which corresponds to the second intermediate domain (zeta = -47.3 mV). There the conductance of the gel layer deduced from the treatment of streaming potential data was found to be compatible with the number of ionic sites independently determined by the electron spin resonance technique.
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Affiliation(s)
- Philippe Déjardin
- European Membrane Institute, UMR 5635 (CNRS, ENSCM, UMII), Université Montpellier II, CC047, 2 Place Eugène Bataillon, F-34095 Montpellier 5, France.
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