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Open AccessFeature PaperArticle

Effect of Amplitude on the Surface Dilational Visco-Elasticity of Protein Solutions

1
Institute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, 03680 Kyiv (Kiev), Ukraine
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Institute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine, 03680 Kyiv (Kiev), Ukraine
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Oncology Department, Odesa National Medical University, 65000 Odesa, Ukraine
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SINTERFACE Technologies, D12489 Berlin, Germany
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MPI Colloids and Interfaces, 14424 Potsdam, Germany
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2018, 2(4), 57; https://doi.org/10.3390/colloids2040057
Received: 17 October 2018 / Revised: 6 November 2018 / Accepted: 7 November 2018 / Published: 10 November 2018
Harmonic drop surface area oscillations are performed at a fixed frequency (0.1 Hz) to measure the dilational visco-elasticity for three proteins: β-casein (BCS), β-lactoglobulin (BLG), and human serum albumin (HSA). The surface area oscillations were performed with different amplitudes in order to find the origin of non-linearity effects. The analysis of data shows that the non-linearity in the equation of state—i.e., the relation between surface pressure and surface concentration of adsorbed protein molecules—is the main source of the amplitude effects on the apparent visco-elasticity, while perturbations due to non-uniform expansions and compressions of the surface layer, inertia effects leading to deviations of the drop profile from the Laplacian shape, or convective transport in the drop bulk are of less importance. While for the globular proteins, HSA and BLG the amplitude effects on the apparent visco-elasticity are rather large, for the non-globular protein BCS this effect is negligible in the studied range of up to 10% area deformation. View Full-Text
Keywords: surface dilational visco-elasticity; protein adsorption; drop profile analysis tensiometry; drop oscillation experiments; amplitude effects surface dilational visco-elasticity; protein adsorption; drop profile analysis tensiometry; drop oscillation experiments; amplitude effects
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MDPI and ACS Style

Kovalchuk, V.I.; Aksenenko, E.V.; Trukhin, D.V.; Makievski, A.V.; Fainerman, V.B.; Miller, R. Effect of Amplitude on the Surface Dilational Visco-Elasticity of Protein Solutions. Colloids Interfaces 2018, 2, 57.

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