Electrochemical oxidation of quercetin in hydro-alcoholic solution

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....
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Autor*in:	Timbola Ana K. [verfasserIn] Souza Cristine D. de [verfasserIn] Giacomelli Cristiano [verfasserIn] Spinelli Almir [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2006

Schlagwörter:	antioxidants quercetin electrochemistry UV-Vis spectroscopy

Übergeordnetes Werk:	In: Journal of the Brazilian Chemical Society - Sociedade Brasileira de Química, 2017, 17(2006), 1, Seite 139-148
Übergeordnetes Werk:	volume:17 ; year:2006 ; number:1 ; pages:139-148

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Katalog-ID:	DOAJ056544677

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spelling	(DE-627)DOAJ056544677 (DE-599)DOAJ6620c254d5f044fe92315f6b70258e6d DE-627 ger DE-627 rakwb eng QD1-999 Timbola Ana K. verfasserin aut Electrochemical oxidation of quercetin in hydro-alcoholic solution 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 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. antioxidants quercetin electrochemistry UV-Vis spectroscopy Chemistry Souza Cristine D. de verfasserin aut Giacomelli Cristiano verfasserin aut Spinelli Almir verfasserin aut In Journal of the Brazilian Chemical Society Sociedade Brasileira de Química, 2017 17(2006), 1, Seite 139-148 (DE-627)32461330X (DE-600)2028738-0 16784790 nnns volume:17 year:2006 number:1 pages:139-148 https://doaj.org/article/6620c254d5f044fe92315f6b70258e6d kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020 kostenfrei https://doaj.org/toc/0103-5053 Journal toc kostenfrei https://doaj.org/toc/1678-4790 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 17 2006 1 139-148
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allfieldsGer	(DE-627)DOAJ056544677 (DE-599)DOAJ6620c254d5f044fe92315f6b70258e6d DE-627 ger DE-627 rakwb eng QD1-999 Timbola Ana K. verfasserin aut Electrochemical oxidation of quercetin in hydro-alcoholic solution 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 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. antioxidants quercetin electrochemistry UV-Vis spectroscopy Chemistry Souza Cristine D. de verfasserin aut Giacomelli Cristiano verfasserin aut Spinelli Almir verfasserin aut In Journal of the Brazilian Chemical Society Sociedade Brasileira de Química, 2017 17(2006), 1, Seite 139-148 (DE-627)32461330X (DE-600)2028738-0 16784790 nnns volume:17 year:2006 number:1 pages:139-148 https://doaj.org/article/6620c254d5f044fe92315f6b70258e6d kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020 kostenfrei https://doaj.org/toc/0103-5053 Journal toc kostenfrei https://doaj.org/toc/1678-4790 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 17 2006 1 139-148
allfieldsSound	(DE-627)DOAJ056544677 (DE-599)DOAJ6620c254d5f044fe92315f6b70258e6d DE-627 ger DE-627 rakwb eng QD1-999 Timbola Ana K. verfasserin aut Electrochemical oxidation of quercetin in hydro-alcoholic solution 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 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. antioxidants quercetin electrochemistry UV-Vis spectroscopy Chemistry Souza Cristine D. de verfasserin aut Giacomelli Cristiano verfasserin aut Spinelli Almir verfasserin aut In Journal of the Brazilian Chemical Society Sociedade Brasileira de Química, 2017 17(2006), 1, Seite 139-148 (DE-627)32461330X (DE-600)2028738-0 16784790 nnns volume:17 year:2006 number:1 pages:139-148 https://doaj.org/article/6620c254d5f044fe92315f6b70258e6d kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000100020 kostenfrei https://doaj.org/toc/0103-5053 Journal toc kostenfrei https://doaj.org/toc/1678-4790 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 17 2006 1 139-148
language	English
source	In Journal of the Brazilian Chemical Society 17(2006), 1, Seite 139-148 volume:17 year:2006 number:1 pages:139-148
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authorswithroles_txt_mv	Timbola Ana K. @@aut@@ Souza Cristine D. de @@aut@@ Giacomelli Cristiano @@aut@@ Spinelli Almir @@aut@@
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callnumber-first	Q - Science
author	Timbola Ana K.
spellingShingle	Timbola Ana K. misc QD1-999 misc antioxidants misc quercetin misc electrochemistry misc UV-Vis spectroscopy misc Chemistry Electrochemical oxidation of quercetin in hydro-alcoholic solution
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topic_title	QD1-999 Electrochemical oxidation of quercetin in hydro-alcoholic solution antioxidants quercetin electrochemistry UV-Vis spectroscopy
topic	misc QD1-999 misc antioxidants misc quercetin misc electrochemistry misc UV-Vis spectroscopy misc Chemistry
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title	Electrochemical oxidation of quercetin in hydro-alcoholic solution
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title_full	Electrochemical oxidation of quercetin in hydro-alcoholic solution
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title_sort	electrochemical oxidation of quercetin in hydro-alcoholic solution
callnumber	QD1-999
title_auth	Electrochemical oxidation of quercetin in hydro-alcoholic solution
abstract	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.
abstractGer	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.
abstract_unstemmed	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.
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title_short	Electrochemical oxidation of quercetin in hydro-alcoholic solution
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