Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers
An. acad. bras. ciênc
; 89(3): 1381-1389, July-Sept. 2017. tab, graf
Article
en En
| LILACS
| ID: biblio-886739
Biblioteca responsable:
BR1.1
ABSTRACT
ABSTRACT A new modified electrode for indirect sensing of OH· and radical scavengers was described. The electrochemical polymerization of methylene blue in aqueous solutions and the properties of the resulting films on a glassy carbon electrode were carried out using cyclic voltammetry. A surface coverage of 1.11 × 109mol cm2 was obtained, revealing a complete surface coverage of the polymeric film on the electrode surface. OH· was able to destroy the poly(methylene blue) film by exposure to a Fenton solution. The loss of the electrochemical signal of the residual polymeric film attached to the electrode surface was related to the extent of its dissolution. The applicability of the sensor was demonstrated by evaluating the OH radical scavenging effect on different concentrations of ascorbic acid. The obtained radical scavenging capacity were 31.4%, 55.7%, 98.9% and 65.7% for the ascorbic acid concentrations of 5, 10, 30 and 50 mM, respectively.
Palabras clave
Texto completo:
1
Banco de datos:
LILACS
Asunto principal:
Depuradores de Radicales Libres
/
Azul de Metileno
Idioma:
En
Revista:
An. acad. bras. ciênc
Asunto de la revista:
CIENCIA
Año:
2017
Tipo del documento:
Article
País de afiliación:
Brasil