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
in English
| LILACS
| ID: biblio-886739
Responsible library:
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.
Full text:
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Collection:
International databases
Database:
LILACS
Main subject:
Free Radical Scavengers
/
Methylene Blue
Language:
English
Journal:
An. acad. bras. ciênc
Journal subject:
Science
Year:
2017
Document type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Centro Universitário UNIVATES/BR