Electrochemistry, surface plasmon resonance, and quartz crystal microbalance: an associative study on cytochrome c adsorption on pyridine tail-group monolayers on gold

Paulo, Tércio de F., de Sousa, Ticyano P., de Abreu, Dieric S., Felício, Nathalie H., Bernhardt, Paul V., Lopes, Luiz G. de F., Sousa, Eduardo H. S. and Diógenes, Izaura C. N. (2013) Electrochemistry, surface plasmon resonance, and quartz crystal microbalance: an associative study on cytochrome c adsorption on pyridine tail-group monolayers on gold. Journal of Physical Chemistry B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical, 117 29: 8673-8680. doi:10.1021/jp400694k


Author Paulo, Tércio de F.
de Sousa, Ticyano P.
de Abreu, Dieric S.
Felício, Nathalie H.
Bernhardt, Paul V.
Lopes, Luiz G. de F.
Sousa, Eduardo H. S.
Diógenes, Izaura C. N.
Title Electrochemistry, surface plasmon resonance, and quartz crystal microbalance: an associative study on cytochrome c adsorption on pyridine tail-group monolayers on gold
Journal name Journal of Physical Chemistry B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical   Check publisher's open access policy
ISSN 1520-6106
1520-5207
Publication date 2013-07-25
Sub-type Article (original research)
DOI 10.1021/jp400694k
Volume 117
Issue 29
Start page 8673
End page 8680
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2014
Language eng
Formatted abstract
Quartz crystal microbalance (QCM), surface plasmon resonance (SPR), and electrochemistry techniques were used to study the electron-transfer (ET) reaction of cytochrome 𝒸 (Cyt 𝒸) on gold surfaces modified with thionicotinamide, thioisonicotinamide, 4-mercaptopyridine, 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol, 5-phenyl-1,3,4-oxadiazole-2-thiol, 4,4′-bipyridine, and 4,4′-dithiopyridine. The electrochemical results showed that the ET process is complex, being chiefly diffusional with steps depending on the orientation of the pyridine or phenyl tail group of the modifiers. The correlation between the electrochemical results and those acquired by SPR and QCM indicated the presence of an adlayer of Cyt 𝒸 adsorbed on the thiolate SAMs. This adlayer, although being not electroactive, is essential to assess the ET reaction of Cyt 𝒸 in solution. The results presented in this work are consistent with the statement (Feng, Z. Q.; Imabayashi, S.; Kakiuchi, T.; Niki, K. J. Electroanal. Chem. 1995, 394, 149−154) that the ET reaction of Cyt 𝒸 can be explained in terms of the through-bond tunneling mechanism.
Keyword Self-assembled monolayers
Electron-transfer reactions
Enhanced Raman-scattering
Mercury-electrode
Thio compounds
Recognition
Stability
Apoptosis
Complex
SAM
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Chemistry and Molecular Biosciences
 
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