Publicação
Electrochemical oxidation of quercetin in hydro-alcoholic solution
| Resumo: | The electrochemistry of quercetin hydro-alcoholic solutions of pH 2.2 to 9.2 was studied by cyclic voltammetry, controlled-potential electrolysis and UV-Vis spectroscopy. Cyclic voltammograms for quercetin showed three oxidation peaks and one reduction peak depending on the experimental conditions. The two-electron two-proton oxidation process at the first peak led to the formation of the corresponding ortho-quinone, which is an electrochemically active and unstable species, as evidenced by the dependence of the cyclic voltammogram profile on the applied scan rate, in agreement with the EC mechanism. Controlled-potential electrolysis yielded three products as characterized by UV-Vis spectroscopy. A reaction scheme comprising electrochemical and chemical steps was proposed for the electro-oxidation of the quercetin in hydro-alcoholic solutions on basis of experimental evidences obtained in this work and elsewhere. |
|---|---|
| Autores principais: | Timbola,Ana K. |
| Outros Autores: | Souza,Cristine D. de; Giacomelli,Cristiano; Spinelli,Almir |
| Assunto: | antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| Ano: | 2006 |
| País: | Brasil |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | IBICT |
| Idioma: | inglês |
| Origem: | Oasisbr |
| _version_ | 1871506552266948608 |
|---|---|
| author | Timbola,Ana K. |
| author2 | Souza,Cristine D. de Giacomelli,Cristiano Spinelli,Almir |
| author2_role | author author author |
| author_facet | Timbola,Ana K. Souza,Cristine D. de Giacomelli,Cristiano Spinelli,Almir |
| author_role | author |
| country_str | BR |
| creators_json_txt | [{\"Person.name\":\"Timbola,Ana K.\"},{\"Person.name\":\"Souza,Cristine D. de\"},{\"Person.name\":\"Giacomelli,Cristiano\"},{\"Person.name\":\"Spinelli,Almir\"}] |
| datacite.creators.creator.creatorName.fl_str_mv | Timbola,Ana K. Souza,Cristine D. de Giacomelli,Cristiano Spinelli,Almir |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| datacite.titles.title.fl_str_mv | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| dc.creator.none.fl_str_mv | Timbola,Ana K. Souza,Cristine D. de Giacomelli,Cristiano Spinelli,Almir |
| dc.format.none.fl_str_mv | text/html |
| dc.identifier.none.fl_str_mv | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | Sociedade Brasileira de Química |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.source.none.fl_str_mv | Journal of the Brazilian Chemical Society v.17 n.1 2006 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
| dc.subject.none.fl_str_mv | antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| dc.title.fl_str_mv | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | The electrochemistry of quercetin hydro-alcoholic solutions of pH 2.2 to 9.2 was studied by cyclic voltammetry, controlled-potential electrolysis and UV-Vis spectroscopy. Cyclic voltammograms for quercetin showed three oxidation peaks and one reduction peak depending on the experimental conditions. The two-electron two-proton oxidation process at the first peak led to the formation of the corresponding ortho-quinone, which is an electrochemically active and unstable species, as evidenced by the dependence of the cyclic voltammogram profile on the applied scan rate, in agreement with the EC mechanism. Controlled-potential electrolysis yielded three products as characterized by UV-Vis spectroscopy. A reaction scheme comprising electrochemical and chemical steps was proposed for the electro-oxidation of the quercetin in hydro-alcoholic solutions on basis of experimental evidences obtained in this work and elsewhere. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| id | oasisbr_cf6ffb0e2d739a7e8d2ee4e211f3a741 |
| identifier.url.fl_str_mv | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020 |
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| language | eng |
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| person_str_mv | Timbola,Ana K. Souza,Cristine D. de Giacomelli,Cristiano Spinelli,Almir |
| publishDate | 2006 |
| publisher.none.fl_str_mv | Sociedade Brasileira de Química |
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| spelling | Electrochemical oxidation of quercetin in hydro-alcoholic solutionTimbola,Ana K.Souza,Cristine D. deGiacomelli,CristianoSpinelli,AlmirantioxidantsquercetinelectrochemistryUV-Vis spectroscopyopen accesshttp://purl.org/coar/access_right/c_abf2http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020URLhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020URLHasVersion2006-02-01The electrochemistry of quercetin hydro-alcoholic solutions of pH 2.2 to 9.2 was studied by cyclic voltammetry, controlled-potential electrolysis and UV-Vis spectroscopy. Cyclic voltammograms for quercetin showed three oxidation peaks and one reduction peak depending on the experimental conditions. The two-electron two-proton oxidation process at the first peak led to the formation of the corresponding ortho-quinone, which is an electrochemically active and unstable species, as evidenced by the dependence of the cyclic voltammogram profile on the applied scan rate, in agreement with the EC mechanism. Controlled-potential electrolysis yielded three products as characterized by UV-Vis spectroscopy. A reaction scheme comprising electrochemical and chemical steps was proposed for the electro-oxidation of the quercetin in hydro-alcoholic solutions on basis of experimental evidences obtained in this work and elsewhere.engtext/htmlSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society v.17 n.1 2006reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQjournal articlehttp://purl.org/coar/resource_type/c_6501literatureVoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85 |
| spellingShingle | Electrochemical oxidation of quercetin in hydro-alcoholic solution Timbola,Ana K. antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| status | SINGLETON |
| status_str | VoR |
| subject.fl_str_mv | antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| title | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| title_full | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| title_fullStr | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| title_full_unstemmed | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| title_short | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| title_sort | Electrochemical oxidation of quercetin in hydro-alcoholic solution |
| topic | antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| topic_facet | antioxidants quercetin electrochemistry UV-Vis spectroscopy |
| url | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020 |
| visible | 1 |
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