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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
23/11/2022 |
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Data da última atualização: |
23/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SILVA, P. F. da; RIBEIRO, T. S.; GOMES, B. F.; SILVA, G. T. S. T. da; LOBO, C. M. S.; CARMO, M.; OLIVEIRA, C. R. de; BERNARDES FILHO, R.; ROTH, C.; COLNAGO, L. A. |
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Afiliação: |
CAUE RIBEIRO DE OLIVEIRA, CNPDIA; RUBENS BERNARDES FILHO, CNPDIA; LUIZ ALBERTO COLNAGO, CNPDIA. |
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Título: |
Miniaturized carbon fiber paper electrodes for In situ high resolution NMR analyses. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Analalytical Chemistry, v. 94, 2022. |
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Páginas: |
15223–15230 |
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DOI: |
https://doi.org/10.1021/acs.analchem.2c02058 |
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Idioma: |
Inglês |
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Conteúdo: |
Combining spectroscopic techniques with electrochemistry is a promising strategy, as it allows the detailed investigation of the species that are consumed and produced by the reaction in real time. However, as with any in situ coupling technique, the junction between NMR and electrochemistry presents some challenges, notably the distortion of NMR signals due to the placement of electrodes close to or within the detection region. In this work, miniaturized electrodes made of carbon fiber paper were developed and later modified with platinum. Platinum decoration by cathodic deposition was chosen, as platinum is a prominent element in electrocatalysis, able to catalyze a large variety of reactions. To evaluate the efficiency of this electrochemical system, the oxidation of ascorbic acid was used as amodel reaction. It was observed that the electrodes caused substantial signal distortion when placed within the detection region (full width at half-maximum equal to 1.46 Hz), whereas no distortion was observed when the electrodes were placed 1 mm above the detection region (full width at half-maximum equal to 0.95 Hz). With this system, it was also possible to monitor the magnetoelectrolysis effect, caused by the interaction of the magnetic field with the flowing ions, leading to a doubling of the ascorbic acid oxidation rate, compared to the reaction performed without a magnetic field. In addition to its low cost and simplicity in preparation, the developed electrode system allows the electrode surface to be easily modified with other suitable catalysts. MenosCombining spectroscopic techniques with electrochemistry is a promising strategy, as it allows the detailed investigation of the species that are consumed and produced by the reaction in real time. However, as with any in situ coupling technique, the junction between NMR and electrochemistry presents some challenges, notably the distortion of NMR signals due to the placement of electrodes close to or within the detection region. In this work, miniaturized electrodes made of carbon fiber paper were developed and later modified with platinum. Platinum decoration by cathodic deposition was chosen, as platinum is a prominent element in electrocatalysis, able to catalyze a large variety of reactions. To evaluate the efficiency of this electrochemical system, the oxidation of ascorbic acid was used as amodel reaction. It was observed that the electrodes caused substantial signal distortion when placed within the detection region (full width at half-maximum equal to 1.46 Hz), whereas no distortion was observed when the electrodes were placed 1 mm above the detection region (full width at half-maximum equal to 0.95 Hz). With this system, it was also possible to monitor the magnetoelectrolysis effect, caused by the interaction of the magnetic field with the flowing ions, leading to a doubling of the ascorbic acid oxidation rate, compared to the reaction performed without a magnetic field. In addition to its low cost and simplicity in preparation, the developed electrode system allows... Mostrar Tudo |
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Palavras-Chave: |
Magnetoelectrolysis effect; NMR. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02384naa a2200277 a 4500
001 2148653
005 2024-01-23
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1021/acs.analchem.2c02058$2DOI
100 1 $aSILVA, P. F. da
245 $aMiniaturized carbon fiber paper electrodes for In situ high resolution NMR analyses.$h[electronic resource]
260 $c2022
300 $a15223–15230
520 $aCombining spectroscopic techniques with electrochemistry is a promising strategy, as it allows the detailed investigation of the species that are consumed and produced by the reaction in real time. However, as with any in situ coupling technique, the junction between NMR and electrochemistry presents some challenges, notably the distortion of NMR signals due to the placement of electrodes close to or within the detection region. In this work, miniaturized electrodes made of carbon fiber paper were developed and later modified with platinum. Platinum decoration by cathodic deposition was chosen, as platinum is a prominent element in electrocatalysis, able to catalyze a large variety of reactions. To evaluate the efficiency of this electrochemical system, the oxidation of ascorbic acid was used as amodel reaction. It was observed that the electrodes caused substantial signal distortion when placed within the detection region (full width at half-maximum equal to 1.46 Hz), whereas no distortion was observed when the electrodes were placed 1 mm above the detection region (full width at half-maximum equal to 0.95 Hz). With this system, it was also possible to monitor the magnetoelectrolysis effect, caused by the interaction of the magnetic field with the flowing ions, leading to a doubling of the ascorbic acid oxidation rate, compared to the reaction performed without a magnetic field. In addition to its low cost and simplicity in preparation, the developed electrode system allows the electrode surface to be easily modified with other suitable catalysts.
653 $aMagnetoelectrolysis effect
653 $aNMR
700 1 $aRIBEIRO, T. S.
700 1 $aGOMES, B. F.
700 1 $aSILVA, G. T. S. T. da
700 1 $aLOBO, C. M. S.
700 1 $aCARMO, M.
700 1 $aOLIVEIRA, C. R. de
700 1 $aBERNARDES FILHO, R.
700 1 $aROTH, C.
700 1 $aCOLNAGO, L. A.
773 $tAnalalytical Chemistry$gv. 94, 2022.
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Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 48 | |
| 5. |  | NASCIMENTO, A. R. P.; TAVARES, S. C. C. de H.; GRAZIERA, F.; BEZERRA, R.; LACERDA, M.; MARIANO, R. L. R. Avaliação da patogenicidade da bactéria da necrose em videiras (Vitis spp.). Fitopatologia Brasileira, Brasília, v. 23, p. 213, ago. 1998. Suplemento. Edição dos Resumos do 31 Congresso Brasileiro de Fitopatologia, Fortaleza, 1998.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| 6. | | BEZERRA, R. G.; NUNES, L. A. Y.; NUNES, P. C.; BRILHANTE, N. A.; ROSÁRIO, A. A. S. Formação de educadores agroflorestais no noroeste do Estado de Mato Grosso. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 5., 2004, Curitiba. SAFs: desenvolvimento com proteção ambiental: anais. Colombo: Embrapa Florestas, 2004. p. 44-46. (Embrapa Florestas. Documentos, 98).| Biblioteca(s): Embrapa Florestas. |
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| 8. | | LIMA, D. P. de; SANTOS, C.; SILVA, R. de S.; YOSHIOKA, E. T. O.; BEZERRA, R. M. Contaminação por metais pesados em peixes e água da bacia do rio Cassiporé, estado do Amapá, Brasil. Acta Amazônica, Manaus, v. 15, n. 4, p. 405-414, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
| Biblioteca(s): Embrapa Amapá. |
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| 9. | | FERNANDES, S. S. L.; MATOS, A. T.; MOITINHO, M. R.; BEZERRA, R. A.; PEREIRA, Z. V.; PADOVAN, M. P. Checklist da composição arbustiva-arbórea de uma Floresta Estacional Semidecidual no Distrito de Guaçu, Município de Dourados, MS. In: SEMINÁRIO DE AGROECOLOGIA DE MATO GROSSO DO SUL, 3.; ENCONTRO DE PRODUTORES AGROECOLÓGICOS DE MS, 2., 2010, Corumbá. Construindo um futuro sustentável e solidário: anais. Dourados: Embrapa Agropecuária Oeste; Corumbá: Embrapa Pantanal; Campo Grande: Embrapa Gado de Corte, 2010. Editado por: Milton Parron Padovan, Ivo de Sá Motta, Hamilton Kikuti, Aurélio V. Borsato, Rogério Ferreira da Silva, Adalgiza Inês Campolim, Alzira Salet Menegat, Alberto Faiden. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 11. | | LOPES, I. R. V.; FREITAS, E. R.; LIMA, J. R.; VIANA NETO, J. L.; BEZERRA, R. M.; LIMA, R. C. Desempenho e qualidade dos ovos de poedeiras comerciais alimentadas com rações contendo farelo de coco tratado ou não com antioxidante. Revista Brasileira de Zootecnia, Viçosa, v. 40, n. 11, p. 2431-2438, 2011.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 13. | | BUARQUE, D. S.; CASTRO, P. F. de; SANTOS, F. M. S.; LEMOS, D.; CARVALHO JUNIOR, L. B.; BEZERRA, R. S. Digestive peptidases and proteinases in the midgut gland of the pink shrimp Farfantepenaeus paulensis (Crustacea, Decapoda, Penaeidae). Aquaculture Research, Oxford, v. 40, n. 7, p. 861-870, 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Meio-Norte. |
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| 14. | | CAMPECHE, D. F. B.; ANDRADE, D. H. de H.; SOUZA, A. M.; MELO, J. F. B.; BEZERRA, R. de S. Dietary protein: lipid ratio changes growth, digestive enzyme activity, metabolic profile and haematological parameters in hybrid surubim (Pseudoplatystoma fasciatum Leiarius marmoratus). Aquaculture Research, v. 49, n. 7, p. 2486-2494, 2018.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Semiárido. |
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| 15. | | ARRUDA, F. A. V.; BEZERRA, R.; RIBEIRO, F. L.; SANTOS, J. W. dos; KAWAS, J. R.; SHELTON, J. M. The interaction of environmental variables (time of day and shade vs sun) and level of nutrition on animal response (body temperature, respiratory rate, water intake and weight gains) with hair sheep. In: REUNIÃO TÉCNICO-CIENTÍFICA DO PROGRAMA DE APOIO À PESQUISA COLABORATIVA DE PEQUENOS RUMINANTES, 1., 1986, Sobral. Caprinos e ovinos no Nordeste do Brasil: anais. Sobral: EMBRAPA-CNPC: SR-CRSP, 1986. p. 259-265. (EMBRAPA-CNPC. Documentos, 6).| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 16. | | MACHADO, Y. de L.; RODRIGUES, H.; BEZERRA, R. de A.; MAZZETTO, S. E.; RIOS, M. A. de S. Performance de óleos naftênicos: estabilidade térmica e lubricidade. Cadernos de Ciência & Tecnologia, Brasília, v. 36, n. 1, e26389, jan./abr. 2019 Título em inglês: Performance of naphthenic oils: thermal stability and lubricity.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 19. | | ÇIÇEK, S. S.; PÉREZ, M. G; WENZEL-STORJOHANN, A.; BEZERRA, R. M.; SEGOVIA, J. F. O.; GIRRESER, U.; KANZAKI, I.; TASDEMIR, D. Antimicrobial prenylated isoflavones from the leaves of the Amazonian medicinal plant vatairea guianensis Aubl. Journal of Natural Products, v. 85, p. 927-935, 2022.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Amapá. |
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| Registros recuperados : 48 | |
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