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Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers
BRAUN, WALTER A; HORN, BRUNA C; HOEHNE, LUCÉLIA; STÜLP, SIMONE; ROSA, MARCELO B DA; HILGEMANN, MAURÍCIO.
  • BRAUN, WALTER A; Centro Universitário UNIVATES. Centro de Ciências Exatas e Tecnológicas. Lajeado. BR
  • HORN, BRUNA C; Centro Universitário UNIVATES. Centro de Ciências Exatas e Tecnológicas. Lajeado. BR
  • HOEHNE, LUCÉLIA; Centro Universitário UNIVATES. Centro de Ciências Exatas e Tecnológicas. Lajeado. BR
  • STÜLP, SIMONE; Centro Universitário UNIVATES. Centro de Ciências Exatas e Tecnológicas. Lajeado. BR
  • ROSA, MARCELO B DA; Centro Universitário UNIVATES. Centro de Ciências Exatas e Tecnológicas. Lajeado. BR
  • HILGEMANN, MAURÍCIO; Centro Universitário UNIVATES. Centro de Ciências Exatas e Tecnológicas. Lajeado. BR
An. acad. bras. ciênc ; 89(3): 1381-1389, July-Sept. 2017. tab, graf
Article in English | LILACS | ID: biblio-886739
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.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Free Radical Scavengers / Methylene Blue Language: English Journal: An. acad. bras. ciênc Journal subject: Science Year: 2017 Type: Article Affiliation country: Brazil Institution/Affiliation country: Centro Universitário UNIVATES/BR

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Full text: Available Index: LILACS (Americas) Main subject: Free Radical Scavengers / Methylene Blue Language: English Journal: An. acad. bras. ciênc Journal subject: Science Year: 2017 Type: Article Affiliation country: Brazil Institution/Affiliation country: Centro Universitário UNIVATES/BR