Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers
Document title: Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers
Journal: Anais da Academia Brasileira de Ciencias
Database: PERIÓDICA
System number: 000412233
ISSN: 0001-3765
Authors: 1
1
1
1
2
1
Institutions: 1Centro Universitario UNIVATES, Centro de Ciencias Exatas e Tecnologicas, Lajeado, Rio Grande do Sul. Brasil
2Universidade Federal de Santa Maria, Departamento de Quimica, Santa Maria, Rio Grande do Sul. Brasil
Year:
Season: Sep
Volumen: 89
Number: 3
Pages: 1381-1390
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English 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
Disciplines: Química
Keyword: Bioquímica,
Química farmacéutica,
Sensores electroquímicos,
Reactivo de Fenton,
Electrodos modificados,
Secuestro químico,
Radical hidroxilo,
Hidroxilo
Keyword: Chemistry,
Biochemistry,
Medicinal chemistry,
Electrochemical sensors,
Fenton reagent,
Modified electrodes,
Chemical scavenging,
Hydroxil radical
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