Screen printed electrode modified with reduced graphene oxide obtained by ɤ radiation for levonorgestrel detection
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2021
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FRONTEIRAS EM ELETROQUÍMICA E ELETROANALÍTICA, 2.: AVANÇOS REALIZADOS POR JOVENS MULHERES CIENTISTAS
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INTRODUCTION Screen printed electrodes (SPE) have attracted attention due to their
fast and accurate response, high sensibility, specificity, and portable platforms. To
increase their electrical carrier mobility and sensibility, the working electrode surface has
been modified using reduced graphene oxide (rGO) [1]. In the present work, gamma
radiation reduced Graphene Oxide (GO) to produce rGO in a sustainable method that
avoids toxic reagents and the production of hazardous chemical residues [2].
Levonorgestrel (LNG) is a synthetic contraceptive hormone of worldwide concern, being
harmful to aquatic organisms, even at low concentrations, e.g., 0.024 nmmol L-1 [3].
METHODOLOGY Reduced graphene oxide was obtained using GO (10 mg mL-1)
dispersed in a water/isopropanol. The sample was irradiated in the Multipurpose Gamma
Irradiation Facility at CETER/IPEN/CNEN-SP, at a dose rate of 10 kGy h-1 and 80.0 kGy
in inert conditions. The SPE was modified by drop casting 10 μL of the rGO solution and
dried at room temperature. The rGO-SPE was characterized by Raman spectroscopy and
the electrochemical behavior of LNG was investigated using cyclic voltammetry (CV) in
phosphate buffered saline (PBS) medium (pH 7.0) within the oxidation window 0.0-1.0
V and 25 mV s-1 (Fig. 1).
RESULTS The Raman spectrum showed D (1.347 cm-1) e G (1.594 cm-1) bands for both
rGO-SPE and SPE. The ID/IG ratio was 0.85 and 1.40 for SPE and rGO-SPE, respectively.
For rGO-SPE, cyclic voltammograms showed a reversible behavior in K4Fe(CN)6 [2
mmol L-1] and in the presence of LNG [6410-9 mol L-1], anode inflection was observed
at 0.6 V, associated with the non-reversible oxidation reaction of LNG.
CONCLUSIONS The surface of the rGO-SPE was uniform, being the ID/IG ratio for the
covered electrode higher than that exhibited by the uncovered one. This electrode
presented electrochemical response to LNG, even at low concentrations, thus proving its
application as an electrochemical sensor for the LNG hormone.
Como referenciar
JACOVONE, RAYNARA M.S.; JESUS, JULIANA M.S. de; TEIXEIRA, ANTONIO C.S.C.; SAKATA, SOLANGE K. Screen printed electrode modified with reduced graphene oxide obtained by ɤ radiation for levonorgestrel detection. In: FRONTEIRAS EM ELETROQUÍMICA E ELETROANALÍTICA, 2.: AVANÇOS REALIZADOS POR JOVENS MULHERES CIENTISTAS, 11-12 de fevereiro, 2021, Online. Resumo... Rio de Janeiro, RJ: Universidade Federal do Rio de Janeiro, 2021. p. 131-132. Disponível em: http://repositorio.ipen.br/handle/123456789/32679. Acesso em: 09 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.