Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.3390/ma14010037 http://hdl.handle.net/11449/205684 |
Resumo: | This study aims to investigate the applicability of a hybrid electrochemical sensor com-posed of cork and graphite (Gr) for detecting caffeine in aqueous solutions. Raw cork (RAC) and regranulated cork (RGC, obtained by thermal treatment of RAC with steam at 380◦C) were tested as modifiers. The results clearly showed that the cork-graphite sensors, GrRAC and GrRGC, exhibited a linear response over a wide range of caffeine concentration (5–1000 µM), with R2 of 0.99 and 0.98, respectively. The limits of detection (LOD), estimated at 2.9 and 6.1 µM for GrRAC and GrRGC, suggest greater sensitivity and reproducibility than the unmodified conventional graphite sensor. The low-cost cork-graphite sensors were successfully applied in the determination of caffeine in soft drinks and pharmaceutical formulations, presenting well-defined current signals when analyz-ing real samples. When comparing electrochemical determinations and high performance liquid chromatography measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of these sensors to determine caffeine in different samples. |
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Repositório Institucional da UNESP |
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Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determinationCaffeineCorkElectrochemical sensorGraphiteModified electrodeThis study aims to investigate the applicability of a hybrid electrochemical sensor com-posed of cork and graphite (Gr) for detecting caffeine in aqueous solutions. Raw cork (RAC) and regranulated cork (RGC, obtained by thermal treatment of RAC with steam at 380◦C) were tested as modifiers. The results clearly showed that the cork-graphite sensors, GrRAC and GrRGC, exhibited a linear response over a wide range of caffeine concentration (5–1000 µM), with R2 of 0.99 and 0.98, respectively. The limits of detection (LOD), estimated at 2.9 and 6.1 µM for GrRAC and GrRGC, suggest greater sensitivity and reproducibility than the unmodified conventional graphite sensor. The low-cost cork-graphite sensors were successfully applied in the determination of caffeine in soft drinks and pharmaceutical formulations, presenting well-defined current signals when analyz-ing real samples. When comparing electrochemical determinations and high performance liquid chromatography measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of these sensors to determine caffeine in different samples.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Laboratório de Eletroquímica Ambiental e Aplicada Universidade Federal do Rio Grande do NorteGrupo de Investigación en Energía y Ambiente Universidad de las Américas Puebla, ExHda. Sta. Catarina MartirLaboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM) Chemical Engineering Department Faculty of Engineering University of PortoNational Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry UNESP, P.O. Box 355National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry UNESP, P.O. Box 355CNPq: 306323/2018-4CNPq: 430121/2016-4CAPES: 88881.156371/2017-01FAPESP: FAPESP 2014/50945-4CAPES: UIDB/50020/2020Universidade Federal do Rio Grande do NorteUniversidad de las Américas PueblaUniversity of PortoUniversidade Estadual Paulista (Unesp)Monteiro, Mayra K. S.Da Silva, Djalma R.Quiroz, Marco A.Vilar, Vítor J. P.Martínez-Huitle, Carlos A. [UNESP]Dos Santos, Elisama V. [UNESP]2021-06-25T10:19:30Z2021-06-25T10:19:30Z2021-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1-17http://dx.doi.org/10.3390/ma14010037Materials, v. 14, n. 1, p. 1-17, 2021.1996-1944http://hdl.handle.net/11449/20568410.3390/ma140100372-s2.0-85098880275Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterialsinfo:eu-repo/semantics/openAccess2021-10-22T13:22:02Zoai:repositorio.unesp.br:11449/205684Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:23:48.908231Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
title |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
spellingShingle |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination Monteiro, Mayra K. S. Caffeine Cork Electrochemical sensor Graphite Modified electrode |
title_short |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
title_full |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
title_fullStr |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
title_full_unstemmed |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
title_sort |
Applicability of cork as novel modifiers to develop electrochemical sensor for caffeine determination |
author |
Monteiro, Mayra K. S. |
author_facet |
Monteiro, Mayra K. S. Da Silva, Djalma R. Quiroz, Marco A. Vilar, Vítor J. P. Martínez-Huitle, Carlos A. [UNESP] Dos Santos, Elisama V. [UNESP] |
author_role |
author |
author2 |
Da Silva, Djalma R. Quiroz, Marco A. Vilar, Vítor J. P. Martínez-Huitle, Carlos A. [UNESP] Dos Santos, Elisama V. [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal do Rio Grande do Norte Universidad de las Américas Puebla University of Porto Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Monteiro, Mayra K. S. Da Silva, Djalma R. Quiroz, Marco A. Vilar, Vítor J. P. Martínez-Huitle, Carlos A. [UNESP] Dos Santos, Elisama V. [UNESP] |
dc.subject.por.fl_str_mv |
Caffeine Cork Electrochemical sensor Graphite Modified electrode |
topic |
Caffeine Cork Electrochemical sensor Graphite Modified electrode |
description |
This study aims to investigate the applicability of a hybrid electrochemical sensor com-posed of cork and graphite (Gr) for detecting caffeine in aqueous solutions. Raw cork (RAC) and regranulated cork (RGC, obtained by thermal treatment of RAC with steam at 380◦C) were tested as modifiers. The results clearly showed that the cork-graphite sensors, GrRAC and GrRGC, exhibited a linear response over a wide range of caffeine concentration (5–1000 µM), with R2 of 0.99 and 0.98, respectively. The limits of detection (LOD), estimated at 2.9 and 6.1 µM for GrRAC and GrRGC, suggest greater sensitivity and reproducibility than the unmodified conventional graphite sensor. The low-cost cork-graphite sensors were successfully applied in the determination of caffeine in soft drinks and pharmaceutical formulations, presenting well-defined current signals when analyz-ing real samples. When comparing electrochemical determinations and high performance liquid chromatography measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of these sensors to determine caffeine in different samples. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T10:19:30Z 2021-06-25T10:19:30Z 2021-01-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.3390/ma14010037 Materials, v. 14, n. 1, p. 1-17, 2021. 1996-1944 http://hdl.handle.net/11449/205684 10.3390/ma14010037 2-s2.0-85098880275 |
url |
http://dx.doi.org/10.3390/ma14010037 http://hdl.handle.net/11449/205684 |
identifier_str_mv |
Materials, v. 14, n. 1, p. 1-17, 2021. 1996-1944 10.3390/ma14010037 2-s2.0-85098880275 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1-17 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129516470534144 |