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Poirier A, Banc A, Kapel R, In M, Stocco A, Ramos L. Impact of structural flexibility in the adsorption of wheat and sunflower proteins at an air/water interface. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Scoppola E, Gochev GG, Drnec J, Pithan L, Novikov D, Schneck E. Investigating the Conformation of Surface-Adsorbed Proteins with Standing-Wave X-ray Fluorescence. Biomacromolecules 2021; 22:5195-5203. [PMID: 34813296 DOI: 10.1021/acs.biomac.1c01136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protein adsorption to surfaces is at the heart of numerous technological and bioanalytical applications, but sometimes, it is also associated with medical risks. To deepen our insights into processes involving layers of surface-adsorbed proteins, high-resolution structural information is essential. Here, we use standing-wave X-ray fluorescence (SWXF) in combination with an optimized liquid-cell setup to investigate the underwater conformation of the random-coiled phosphoprotein β-casein adsorbed to hydrophilic and hydrophobized solid surfaces. The orientation of the protein, as determined through the distributions of sulfur and phosphorus, is found to be sensitive to the chemical nature of the substrate. While no preferred orientations are observed on hydrophobized surfaces, on hydrophilic Al oxide, β-casein is adsorbed as a diblock copolymer with the phosphorylated domain I attached to the surface. Our results demonstrate that targeting biologically relevant chemical elements with SWXF enables a detailed investigation of biomolecular layers under near-physiological conditions.
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Affiliation(s)
- Ernesto Scoppola
- Biomaterials Department, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany
| | - Georgi G Gochev
- Biomaterials Department, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany.,Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Krakow, Poland
| | - Jakub Drnec
- European Synchrotron Radiation Facility (ESRF), 38000 Grenoble, France
| | - Linus Pithan
- European Synchrotron Radiation Facility (ESRF), 38000 Grenoble, France
| | - Dmitri Novikov
- Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
| | - Emanuel Schneck
- Biomaterials Department, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany.,Physics Department, Technische Universität Darmstadt, 64289 Darmstadt, Germany
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β-Lactoglobulin Adsorption Layers at the Water/Air Surface: 5. Adsorption Isotherm and Equation of State Revisited, Impact of pH. COLLOIDS AND INTERFACES 2021. [DOI: 10.3390/colloids5010014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The theoretical description of the adsorption of proteins at liquid/fluid interfaces suffers from the inapplicability of classical formalisms, which soundly calls for the development of more complicated adsorption models. A Frumkin-type thermodynamic 2-d solution model that accounts for nonidealities of interface enthalpy and entropy was proposed about two decades ago and has been continuously developed in the course of comparisons with experimental data. In a previous paper we investigated the adsorption of the globular protein β-lactoglobulin at the water/air interface and used such a model to analyze the experimental isotherms of the surface pressure, Π(c), and the frequency-, f-, dependent surface dilational viscoelasticity modulus, E(c)f, in a wide range of protein concentrations, c, and at pH 7. However, the best fit between theory and experiment proposed in that paper appeared incompatible with new data on the surface excess, Γ, obtained from direct measurements with neutron reflectometry. Therefore, in this work, the same model is simultaneously applied to a larger set of experimental dependences, e.g., Π(c), Γ(c), E(Π)f, etc., with E-values measured strictly in the linear viscoelasticity regime. Despite this ambitious complication, a best global fit was elaborated using a single set of parameter values, which well describes all experimental dependencies, thus corroborating the validity of the chosen thermodynamic model. Furthermore, we applied the model in the same manner to experimental results obtained at pH 3 and pH 5 in order to explain the well-pronounced effect of pH on the interfacial behavior of β-lactoglobulin. The results revealed that the propensity of β-lactoglobulin globules to unfold upon adsorption and stretch at the interface decreases in the order pH 3 > pH 7 > pH 5, i.e., with decreasing protein net charge. Finally, we discuss advantages and limitations in the current state of the model.
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Poirier A, Stocco A, Kapel R, In M, Ramos L, Banc A. Sunflower Proteins at Air-Water and Oil-Water Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2714-2727. [PMID: 33599128 DOI: 10.1021/acs.langmuir.0c03441] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The adsorption of a sunflower protein extract at two air-water and oil-water interfaces is investigated using tensiometry, dilational viscoelasticity, and ellipsometry. For both interfaces, a three step mechanism was evidenced thanks to master curve representations of the data taken at different aging times and protein concentrations. At short times, a diffusion limited adsorption of proteins at interfaces is demonstrated. First, a two-dimensional protein film is formed with a partition of the polypeptide chains in the two phases that depends strongly on the nature of the hydrophobic phase: most of the film is in the aqueous phase at the air-water interface, while it is mostly in the organic phase at the oil-water interface. Then a three-dimensional saturated monolayer of proteins is formed. At short times, adsorption mechanisms are analogous to those found with typical globular proteins, while strong divergences are observed at longer adsorption times. Following the saturation step, a thick layer expands in the aqueous phase and appears associated with the release of large objects in the bulk. The kinetic evolution of this second layer is compatible with a diffusion limited adsorption of the minor population of polymeric complexes with hydrodynamic radius RH ∼ 80 nm, evidenced in equilibrium with hexameric globulins (RH ∼ 6 nm) in solution. These complexes could result from the presence of residual polyphenols in the extract and raise the question of the role of these compounds in the interfacial properties of plant protein extracts.
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Affiliation(s)
- Alexandre Poirier
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
- Institut Charles Sadron (ICS), CNRS-UPR22, 23 rue du Loess BP 84047, 67034 Cedex 2 Strasbourg, France
| | - Romain Kapel
- Site Plateforme Sciences du Vivant et de la Santé, Laboratoire Réactions et Génie des Procédés (LRGP), 54500 Vandoeuvre-les-Nancy, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
| | - Laurence Ramos
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
| | - Amélie Banc
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
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Poirier A, Banc A, Stocco A, In M, Ramos L. Multistep building of a soft plant protein film at the air-water interface. J Colloid Interface Sci 2018; 526:337-346. [DOI: 10.1016/j.jcis.2018.04.087] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/22/2018] [Accepted: 04/23/2018] [Indexed: 01/24/2023]
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Miller R, Aksenenko EV, Zinkovych II, Fainerman VB. Adsorption of proteins at the aqueous solution/alkane interface: Co-adsorption of protein and alkane. Adv Colloid Interface Sci 2015; 222:509-16. [PMID: 25813359 DOI: 10.1016/j.cis.2015.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 09/14/2014] [Accepted: 01/16/2015] [Indexed: 11/19/2022]
Abstract
The equations of state, adsorption isotherms and functions of the distribution of protein molecules in liquid interfacial layers with respect to molar area and the equations for their viscoelastic behavior are presented. This theory was used to determine the adsorption characteristics of β-casein and β-lactoglobulin at water/oil interfaces. The experimental results are shown to be describable quite adequately by the proposed theory with consistent model parameters. The data analysis demonstrated that the β-casein molecule adsorbed at equilibrium conditions is more unfolded as compared with dynamic conditions, and this fact causes the significant increase of the adsorption equilibrium constant. The theory assumes the adsorption of protein molecules from the aqueous solution and a competitive adsorption of alkane molecules from the alkane phase. The comparison of the experimental equilibrium interfacial tension isotherms for β-lactoglobulin at the solution/hexane interface with data calculated using the proposed theoretical model demonstrates that the assumption of a competitive adsorption is essential, and the influence of the hexane molecules on the shape of the adsorption isotherm does in fact exist.
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Affiliation(s)
- R Miller
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, 14424 Potsdam, Germany
| | - E V Aksenenko
- Institute of Colloid Chemistry and Chemistry of Water, Kiev 03680, Ukraine
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Dan A, Wüstneck R, Krägel J, Aksenenko EV, Fainerman VB, Miller R. Interfacial adsorption and rheological behavior of β-casein at the water/hexane interface at different pH. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2012.10.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Langevin D, Monroy F. Interfacial rheology of polyelectrolytes and polymer monolayers at the air–water interface. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.02.002] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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β-Lactoglobulin aggregates in foam films: Correlation between foam films and foaming properties. J Colloid Interface Sci 2009; 336:750-5. [DOI: 10.1016/j.jcis.2009.04.034] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Revised: 04/03/2009] [Accepted: 04/03/2009] [Indexed: 11/24/2022]
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Lau KHA, Bang J, Hawker CJ, Kim DH, Knoll W. Modulation of Protein−Surface Interactions on Nanopatterned Polymer Films. Biomacromolecules 2009; 10:1061-6. [DOI: 10.1021/bm801158x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. H. Aaron Lau
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Joona Bang
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Craig J. Hawker
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Dong Ha Kim
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Wolfgang Knoll
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
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Aguié-Béghin V, Sausse P, Meudec E, Cheynier V, Douillard R. Polyphenol-beta-casein complexes at the air/water interface and in solution: effects of polyphenol structure. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:9600-9611. [PMID: 18826319 DOI: 10.1021/jf801672x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interactions between proteins and plant polyphenols are responsible for astringency and haze formation in beverages and may participate in foam stabilization. The effect of phenolic compounds with different structures, namely, catechin (C), epicatechin (Ec), epigallocatechin (Egc), epicatechin gallate (EcG), and epigallocatechin gallate (EgcG), on the surface properties at the air/liquid interface of beta-casein, chosen as model protein, were monitored by tensiometry and ellipsometry. The formation of complexes in the bulk phase was measured by electrospray ionization mass spectrometry (ESI-MS). Adsorption of polyphenols from pure solution was not observed. Surface pressure, surface concentration, and dilational modulus of the protein adsorption layer were greatly modified in the presence of galloylated flavanol monomers (EcG and EgcG) but not of lower molecular weight polyphenols (<306 g/mol). The formation of polyphenol-protein aggregates in the bulk, as evidenced by ESI-MS and light scattering experiments, was related to the slowdown of protein adsorption.
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Affiliation(s)
- V Aguié-Béghin
- INRA UMR 614 Fractionnement des Agro-Ressources et Environnement (FARE) INRA/Universite de Reims Champagne Ardennes, Centre de Recherche en Environnement et Agronomie, 2 Esplanade R. Garros, BP 224, F-51686 Reims, France.
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Alahverdjieva V, Grigoriev D, Ferri J, Fainerman V, Aksenenko E, Leser M, Michel M, Miller R. Adsorption behaviour of hen egg-white lysozyme at the air/water interface. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2007.12.031] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Henderson MJ, Perriman AW, Robson-Marsden H, White JW. Protein-poly(silicic) acid interactions at the air/solution interface. J Phys Chem B 2007; 109:20878-86. [PMID: 16853707 DOI: 10.1021/jp051908k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of the interface generated by a spread layer of beta-casein on an aqueous colloidal poly(silicic) acid subphase is described. The results are compared with data for the protein alone spread at the air/water interface and the silicate solution. Films develop at the air-solution interface and a strong pH dependence of the interaction causing this is demonstrated. Reflectometry with X-rays and neutrons was used to probe the interaction as a function of subphase pH and film compression. Film thickness, tau/A, scattering length density, rho/A(-2), water volume fraction, phi(w), and surface coverage, Gamma/mg m(-2), were used to quantify the interfacial structure. Where possible, the X-ray and neutron data sets were co-refined enabling phi(w) to be evaluated without assumption regarding the protein density. At pH 5-7, strong protein-silicate interaction occurred, the interface comprising three regions: a discrete protein upper layer on top of a 15 +/- 2 A layer of silicated material followed by a diffuse layer that extended into the subphase.
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Affiliation(s)
- Mark J Henderson
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
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Modifications of the charges at the N-terminus of bovine β-casein: Consequences on its structure and its micellisation. Food Hydrocoll 2007. [DOI: 10.1016/j.foodhyd.2006.03.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Benjamins J, Lyklema J, Lucassen-Reynders EH. Compression/expansion rheology of oil/water interfaces with adsorbed proteins. Comparison with the air/water surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:6181-8. [PMID: 16800674 DOI: 10.1021/la060441h] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Dynamic interfacial tensions and surface dilational moduli were measured for four proteins at three fluid interfaces, as a function of time and concentration. The proteins-beta-casein, beta-lactoglobulin, bovine serum albumin, and ovalbumin-were adsorbed from aqueous solution against air, n-tetradecane, and a triacylglycerol oil. The sinusoidal interfacial compression/expansion, at frequencies ranging from 0.005 to 0.5 Hz, was effected in a dynamic drop tensiometer suited to viscous oil phases. Generally, at interfacial pressures up to 15 mN/m, dilational moduli were purely elastic at frequencies from 0.1 Hz. In this elastic range, in-surface relaxation either was essentially completed or had not yet started within a time on the order of 10 s. Within this time span, protein exchange with the bulk solution was negligible. In cases where in-surface relaxation was completed in the imposed time, the moduli depended only on the equilibrium Pi(Gamma) relationship. We interpret these results in terms of a simple two-dimensional solution model, based on a Gibbs dividing surface, accounting for nonideal mixing to the first order with respect to both entropy and enthalpy. Interfacial mixing enthalpy is shown to have a major effect on the elasticity, with both quantities increasing in the sequence triacylglycerol < tetradecane < air. We also suggest a strong correlation between enthalpy and clean-interface tension that increases in the same order. At each interface, the enthalpy increases with increasing molecular rigidity: beta-casein < beta-lactoglobulin < bovine serum albumin < ovalbumin. Best agreement with the experimental data was obtained with a recently extended version of the model accounting for proteins adopting smaller molecular areas with increasing surface pressure. For interfacial pressures above 15 mN/m, the moduli were generally no longer purely elastic, with viscous loss angles ranging up to 36 degrees. In this range of high pressures, the moduli depended on relaxation mechanisms for which specific kinetic models must be developed.
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Affiliation(s)
- J Benjamins
- Wageningen Centre for Food Sciences, P.O. Box 557, 6700AN Wageningen, The Netherlands
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Maldonado-Valderrama J, Fainerman VB, Aksenenko E, Jose Gálvez-Ruiz M, Cabrerizo-Vílchez MA, Miller R. Dynamics of protein adsorption at the oil–water interface: comparison with a theoretical model. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2004.10.131] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Miller R, Fainerman V, Leser M, Michel M. Kinetics of adsorption of proteins and surfactants. Curr Opin Colloid Interface Sci 2004. [DOI: 10.1016/j.cocis.2004.08.002] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Maldonado-Valderrama J, Martín-Molina A, Gálvez-Ruiz MJ, Martín-Rodríguez A, Cabrerizo-Vílchez MÁ. β-Casein Adsorption at Liquid Interfaces: Theory and Experiment. J Phys Chem B 2004. [DOI: 10.1021/jp048388y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Julia Maldonado-Valderrama
- Biocolloid and Fluid Physics Group, Department of Applied Physics, Faculty of Science, University of Granada, Fuentenueva, s/n, 18071 Granada, Spain, and Laboratoire de Physique Statistique de l'Ecole Normale Supérieure associée au CNRS et aux universités Paris VI et Paris VII, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - Alberto Martín-Molina
- Biocolloid and Fluid Physics Group, Department of Applied Physics, Faculty of Science, University of Granada, Fuentenueva, s/n, 18071 Granada, Spain, and Laboratoire de Physique Statistique de l'Ecole Normale Supérieure associée au CNRS et aux universités Paris VI et Paris VII, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - Maria José Gálvez-Ruiz
- Biocolloid and Fluid Physics Group, Department of Applied Physics, Faculty of Science, University of Granada, Fuentenueva, s/n, 18071 Granada, Spain, and Laboratoire de Physique Statistique de l'Ecole Normale Supérieure associée au CNRS et aux universités Paris VI et Paris VII, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - Antonio Martín-Rodríguez
- Biocolloid and Fluid Physics Group, Department of Applied Physics, Faculty of Science, University of Granada, Fuentenueva, s/n, 18071 Granada, Spain, and Laboratoire de Physique Statistique de l'Ecole Normale Supérieure associée au CNRS et aux universités Paris VI et Paris VII, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - Miguel Ángel Cabrerizo-Vílchez
- Biocolloid and Fluid Physics Group, Department of Applied Physics, Faculty of Science, University of Granada, Fuentenueva, s/n, 18071 Granada, Spain, and Laboratoire de Physique Statistique de l'Ecole Normale Supérieure associée au CNRS et aux universités Paris VI et Paris VII, 24 rue Lhomond, 75231 Paris Cedex 05, France
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