Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electrochemistry, Surface Plasmon Resonance, and Quartz Crystal Microbalance: An Associative Study on Cytochrome c Adsorption on Pyridine Tail-Group Monolayers on Gold

Full text
Author(s):
Paulo, Tercio de F. [1, 2] ; de Sousa, Ticyano P. [2] ; de Abreu, Dieric S. [2] ; Felicio, Nathalie H. [2] ; Bernhardt, Paul V. [3] ; Lopes, Luiz G. de F. [2] ; Sousa, Eduardo H. S. [2] ; Diogenes, Izaura C. N. [2]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo - Brazil
[2] Univ Fed Ceara, Dept Quim Organ & Inorgan, BR-60455970 Fortaleza, Ceara - Brazil
[3] Univ Queensland, Sch Chem & Mol Biosci, Brisbane, Qld 4072 - Australia
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry B; v. 117, n. 29, p. 8673-8680, JUL 25 2013.
Web of Science Citations: 9
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 electro-chemical 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.; Nil, 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. (AU)

FAPESP's process: 11/12479-3 - SELF-ASSEMBLED MONOLAYERS OF SULFUR COMPOUNDS: A SPECTROSCOPY STUDY
Grantee:Tercio de Freitas Paulo
Support Opportunities: Scholarships in Brazil - Post-Doctoral