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Calvo, E.J.; Rothacher, M.S.; Bonazzola, C.; Wheeldon, I.R.; Salvarezza, R.C.; Vela, M.E.; Benitez, G. "Biomimetics with a self-assembled monolayer of catalytically active tethered isoalloxazine on au" (2005) Langmuir. 21(17):7907-7911
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Abstract:

A new biomimetic nanostructured electrocatalyst comprised of a self-assembled monolayer (SAM) of flavin covalently attached to Au by reaction of methylformylisoalloxazine with chemisorbed cysteamine is introduced. Examinations by Fourier transform infrared spectroscopy and scanning tunneling microscopy (STM) show that the flavin molecules are oriented perpendicular to the surface with a 2 nm separation between flavin molecules. As a result of the contrast observed in the STM profiles between areas only covered by unreacted cysteamine and those covered by flavin-cysteamine moieties, it can be seen that the flavin molecules rise 0.7 nm above the chemisorbed cysteamines. The SAM flavin electrocatalyst undergoes fast electron transfer with the underlying Au and shows activity toward the oxidation of enzymatically active β-NADH at pH 7 and very low potential (-0.2 V vs Ag/AgCl), a requirement for use in an enzymatic biofuel cell, and a 100-fold increase in activity with respect to the collisional reaction in solution. © 2005 American Chemical Society.

Registro:

Documento: Artículo
Título:Biomimetics with a self-assembled monolayer of catalytically active tethered isoalloxazine on au
Autor:Calvo, E.J.; Rothacher, M.S.; Bonazzola, C.; Wheeldon, I.R.; Salvarezza, R.C.; Vela, M.E.; Benitez, G.
Filiación:Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, AR-1428 Buenos Aires, Argentina
Instituto National de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Casilla de Correo 16, Suc. 4, 1900 La Plata, Argentina
Palabras clave:Collisional reaction; Cysteamine moieties; Flavin electrocatalysts; Flavin molecules; Catalysis; Enzymes; Fourier transform infrared spectroscopy; Gold; Monolayers; pH effects; Reaction kinetics; Scanning tunneling microscopy; Self assembly; Separation; Biomimetic materials; gold; mercaptamine; methylformylisoalloxazine; nanomaterial; nicotinamide adenine dinucleotide; riboflavin derivative; article; artificial membrane; biomimetics; catalysis; chemical structure; chemistry; electrochemistry; infrared spectroscopy; oxidation reduction reaction; scanning tunneling microscopy; sensitivity and specificity; surface property; Biomimetics; Catalysis; Cysteamine; Electrochemistry; Flavins; Gold; Membranes, Artificial; Microscopy, Scanning Tunneling; Molecular Structure; NAD; Nanostructures; Oxidation-Reduction; Sensitivity and Specificity; Spectroscopy, Fourier Transform Infrared; Surface Properties
Año:2005
Volumen:21
Número:17
Página de inicio:7907
Página de fin:7911
DOI: http://dx.doi.org/10.1021/la050695n
Título revista:Langmuir
Título revista abreviado:Langmuir
ISSN:07437463
CODEN:LANGD
CAS:gold, 7440-57-5; mercaptamine, 156-57-0, 27761-19-9, 60-23-1; nicotinamide adenine dinucleotide, 53-84-9; Cysteamine, 60-23-1; Flavins; Gold, 7440-57-5; Membranes, Artificial; NAD, 53-84-9; methylformylisoalloxazine
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v21_n17_p7907_Calvo

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Citas:

---------- APA ----------
Calvo, E.J., Rothacher, M.S., Bonazzola, C., Wheeldon, I.R., Salvarezza, R.C., Vela, M.E. & Benitez, G. (2005) . Biomimetics with a self-assembled monolayer of catalytically active tethered isoalloxazine on au. Langmuir, 21(17), 7907-7911.
http://dx.doi.org/10.1021/la050695n
---------- CHICAGO ----------
Calvo, E.J., Rothacher, M.S., Bonazzola, C., Wheeldon, I.R., Salvarezza, R.C., Vela, M.E., et al. "Biomimetics with a self-assembled monolayer of catalytically active tethered isoalloxazine on au" . Langmuir 21, no. 17 (2005) : 7907-7911.
http://dx.doi.org/10.1021/la050695n
---------- MLA ----------
Calvo, E.J., Rothacher, M.S., Bonazzola, C., Wheeldon, I.R., Salvarezza, R.C., Vela, M.E., et al. "Biomimetics with a self-assembled monolayer of catalytically active tethered isoalloxazine on au" . Langmuir, vol. 21, no. 17, 2005, pp. 7907-7911.
http://dx.doi.org/10.1021/la050695n
---------- VANCOUVER ----------
Calvo, E.J., Rothacher, M.S., Bonazzola, C., Wheeldon, I.R., Salvarezza, R.C., Vela, M.E., et al. Biomimetics with a self-assembled monolayer of catalytically active tethered isoalloxazine on au. Langmuir. 2005;21(17):7907-7911.
http://dx.doi.org/10.1021/la050695n