Screen printed electrode modified with reduced graphene oxide obtained by ɤ radiation for levonorgestrel detection

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dc.contributor.authorJACOVONE, RAYNARA M.S.pt_BR
dc.contributor.authorJESUS, JULIANA M.S. dept_BR
dc.contributor.authorTEIXEIRA, ANTONIO C.S.C.pt_BR
dc.contributor.authorSAKATA, SOLANGE K.pt_BR
dc.coverageNacionalpt_BR
dc.creator.eventoFRONTEIRAS EM ELETROQUÍMICA E ELETROANALÍTICA, 2.: AVANÇOS REALIZADOS POR JOVENS MULHERES CIENTISTASpt_BR
dc.date.accessioned2022-01-31T15:41:05Z
dc.date.available2022-01-31T15:41:05Z
dc.date.evento11-12 de fevereiro, 2021pt_BR
dc.description.abstractINTRODUCTION 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 [6410-9 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.pt_BR
dc.event.siglaFEEpt_BR
dc.format.extent131-132pt_BR
dc.identifier.citationJACOVONE, 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. <b>Resumo...</b> Rio de Janeiro, RJ: Universidade Federal do Rio de Janeiro, 2021. p. 131-132. Disponível em: http://repositorio.ipen.br/handle/123456789/32679.
dc.identifier.orcid0000-0001-6072-5853pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6072-5853
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/32679
dc.localRio de Janeiro, RJpt_BR
dc.local.eventoOnlinept_BR
dc.publisherUniversidade Federal do Rio de Janeiropt_BR
dc.rightsopenAccesspt_BR
dc.titleScreen printed electrode modified with reduced graphene oxide obtained by ɤ radiation for levonorgestrel detectionpt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorSOLANGE KAZUMI SAKATA
ipen.autorRAYNARA MARIA SILVA JACOVONE
ipen.codigoautor7038
ipen.codigoautor14300
ipen.contributor.ipenauthorSOLANGE KAZUMI SAKATA
ipen.contributor.ipenauthorRAYNARA MARIA SILVA JACOVONE
ipen.date.recebimento22-01
ipen.event.datapadronizada2021pt_BR
ipen.identifier.ipendoc28447pt_BR
ipen.notas.internasResumopt_BR
ipen.type.genreResumo
relation.isAuthorOfPublicationfb62f288-104d-4352-aed0-a18e0da21a1b
relation.isAuthorOfPublicationda20f0e7-9926-4e06-ae80-ccbc18ec0806
relation.isAuthorOfPublication.latestForDiscoveryda20f0e7-9926-4e06-ae80-ccbc18ec0806
sigepi.autor.atividadeSAKATA, SOLANGE K.:7038:220:Npt_BR
sigepi.autor.atividadeJACOVONE, RAYNARA M.S.:14300:220:Spt_BR
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