| SOPOUŠEK, Jakub, Jakub VĚŽNÍK, Josef HOUSER, Petr SKLÁDAL and Karel LACINA. Crucial factors governing the electrochemical impedance on protein-modified surfaces. Electrochimica Acta. OXFORD: Elsevier, 2021, vol. 388, AUG, p. 138616-138622. ISSN 0013-4686. Available from: https://dx.doi.org/10.1016/j.electacta.2021.138616. |
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@article{1838000,
author = {Sopoušek, Jakub and Věžník, Jakub and Houser, Josef and Skládal, Petr and Lacina, Karel},
article_location = {OXFORD},
article_number = {AUG},
doi = {http://dx.doi.org/10.1016/j.electacta.2021.138616},
keywords = {Electrochemical impedance spectroscopy; Polystyrene nanoparticles; Polyacrylic acid; Bovine serum albumin; Cationized bovine serum albumin; Ionic strength; Ionic charge},
language = {eng},
issn = {0013-4686},
journal = {Electrochimica Acta},
title = {Crucial factors governing the electrochemical impedance on protein-modified surfaces},
url = {https://www.sciencedirect.com/science/article/pii/S0013468621009063?via%3Dihub},
volume = {388},
year = {2021}
}
TY - JOUR
ID - 1838000
AU - Sopoušek, Jakub - Věžník, Jakub - Houser, Josef - Skládal, Petr - Lacina, Karel
PY - 2021
TI - Crucial factors governing the electrochemical impedance on protein-modified surfaces
JF - Electrochimica Acta
VL - 388
IS - AUG
SP - 138616
EP - 138616
PB - Elsevier
SN - 00134686
KW - Electrochemical impedance spectroscopy
KW - Polystyrene nanoparticles
KW - Polyacrylic acid
KW - Bovine serum albumin
KW - Cationized bovine serum albumin
KW - Ionic strength
KW - Ionic charge
UR - https://www.sciencedirect.com/science/article/pii/S0013468621009063?via%3Dihub
N2 - Three different electrode surfaces - two nanoporous and one modified with polyelectrolyte - provided with positively and negatively charged model proteins were studied at different conditions to determine characteristics of electrochemical impedance spectroscopy in biosensing. The impedance response in the presence of [Fe(CN)(6)(4-/3-) was simultaneously influenced by two effects - ionic attraction/repulsion and steric hindrance of protein components. The ionic interactions dominated at low ionic strength and at low concentrations of redox probe. On the other hand, the steric hindrance of immobilized proteins affecting mass transfer towards the electrode gained impact gradually with the increasing ionic strength and with the concentration of the redox-active component. The simultaneous effect of these two variables can lead to confusing results which are often misinterpreted when evaluating results from impedimetric affinity biosensors. (C) 2021 Elsevier Ltd. All rights reserved.
ER -
SOPOUŠEK, Jakub, Jakub VĚŽNÍK, Josef HOUSER, Petr SKLÁDAL and Karel LACINA. Crucial factors governing the electrochemical impedance on protein-modified surfaces. \textit{Electrochimica Acta}. OXFORD: Elsevier, 2021, vol.~388, AUG, p.~138616-138622. ISSN~0013-4686. Available from: https://dx.doi.org/10.1016/j.electacta.2021.138616.
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