Deposition of colloid particles on protein layers: Fibrinogen on mica

Adamczyk, Zbǐgniew; Nattich, Małgorzata; Wasilewska, Monika; Sadowska, Marta

doi:10.1016/j.jcis.2011.01.009

Cited by 30 publications

(19 citation statements)

References 40 publications

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“…Note that there are polymers (b), typically containing periodically arranged heavily charged, phosphorylated or sulphonated groups along their chains, [103] possessing linear and flat ζ potential versus pH curves. Reprinted from Shaw [28] (this article was published in Introduction to Colloid and Surface Chemistry , D. J. Shaw, © Elsevier [2003]).…”

Section: Figmentioning

confidence: 99%

Dynamic Light Scattering Based Microelectrophoresis: Main Prospects and Limitations

Uskoković¹

2012

Journal of Dispersion Science and Technology

118

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Microelectrophoresis based on the dynamic light scattering (DLS) effect has been a major tool for assessing and controlling the conditions for stability of colloidal systems. However, both the DLS methods for characterization of the hydrodynamic size of dispersed submicron particles and the theory behind the electrokinetic phenomena are associated with fundamental and practical approximations that limit their sensitivity and information output. Some of these fundamental limitations, including the spherical approximation of DLS measurements and an inability of microelectrophoretic analyses of colloidal systems to detect discrete charges and differ between differently charged particle surfaces due to rotational diffusion and particle orientation averaging, are revisited in this work. Along with that, the main prospects of these two analytical methods are mentioned. A detailed review of the role of zeta potential in processes of biochemical nature is given too. It is argued that although zeta potential has been used as one of the main parameters in controlling the stability of colloidal dispersions, its application potentials are much broader. Manipulating surface charges of interacting species in designing complex soft matter morphologies using the concept of zeta potential, intensively investigated recently, is given as one of the examples. Branching out from the field of colloid chemistry, DLS and zeta potential analyses are now increasingly finding application in drug delivery, biotechnologies, physical chemistry of nanoscale phenomena and other research fields that stand on the frontier of the contemporary science. Coupling the DLS-based microelectrophoretic systems with complementary characterization methods is mentioned as one of the prosperous paths for increasing the information output of these two analytical techniques.

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Section: Figmentioning

confidence: 99%

Dynamic Light Scattering Based Microelectrophoresis: Main Prospects and Limitations

Uskoković¹

2012

Journal of Dispersion Science and Technology

118

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“…This is a rather unusual behavior, contradicting the mean-field DLVO theory, because negatively charged particles are deposited on negatively charged (on average) substrate. However, such deviations were often observed for colloid particle adsorption on protein supporting layers, e.g., fibrinogen (Adamczyk et al 2011a) and albumin (Jachimska et al 2012). They were quantitatively explained in terms of the heterogeneous charge distribution in the supporting layer stemming from molecule density fluctuations.…”

Section: Resultsmentioning

confidence: 99%

Stability of silver nanoparticle monolayers determined by in situ streaming potential measurements

2013

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A silver particle suspension obtained by a chemical reduction was used in this work. Monolayers of these particles (average size 28 nm) on mica modified by poly(allylamine hydrochloride) were produced under diffusion-controlled transport. Monolayer coverages, quantitatively determined by atomic force microscopy (AFM) and SEM, was regulated by adjusting the nanoparticle deposition time and the suspension concentration. The zeta potential of the monolayers was determined by streaming potential measurements carried out under in situ (wet) conditions. These measurements performed for various ionic strengths and pH were interpreted in terms of the three-dimensional (3D) electrokinetic model. The stability of silver monolayers was also investigated using streaming potential and the AFM methods. The decrease in the surface coverage of particles as a function of time and ionic strength varied between 10−1 and 10−4 M was investigated. This allowed one to determine the equilibrium adsorption constant Ka and the binding energy of silver particles (energy minima depth). Energy minima depth were calculated that varied between −18 kT for I = 10−1 M and −19 kT for I = 10−4 for pH 5.5 and T = 298 K. Our investigations suggest that the interactions between surface and nanoparticles are controlled by the electrostatic interactions among ion pairs. It was also shown that the in situ electrokinetic measurements are in accordance with those obtained by more tedious ex situ AFM measurements. This confirmed the utility of the streaming potential method for direct kinetic studies of nanoparticle deposition/release processes.Graphical Abstract

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“…Particle deposition was carried out over 24 hours. Their coverage was determined in situ by a direct optical microscope imaging under wet conditions, and by ex situ AFM imaging according to the method described in previous works [29,30]. Particles were counted over 10-20 equal sized areas chosen at random over mica sheets.…”

Section: Methodsmentioning

confidence: 99%

“…Knowing α(n s ) one can calculate the maximum coverage of particles on a surface covered by sites from the analytical dependence [29] …”

Section: Particle Deposition On Hsa Monolayersmentioning

confidence: 99%

Revealing deposition mechanism of colloid particles on human serum albumin monolayers

Nattich-Rak

Adamczyk

Kujda

2016

Colloids and Surfaces B: Biointerfaces

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Deposition of colloid particles on protein layers: Fibrinogen on mica

Cited by 30 publications

References 40 publications

Dynamic Light Scattering Based Microelectrophoresis: Main Prospects and Limitations

Dynamic Light Scattering Based Microelectrophoresis: Main Prospects and Limitations

Stability of silver nanoparticle monolayers determined by in situ streaming potential measurements

Revealing deposition mechanism of colloid particles on human serum albumin monolayers

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