SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION

A flow injection system using a new and/or re-used graphite screen-printed electrode modified with silver hexacyanoferrate and a Nafion® polymer layer (AgHCF/GSPE) was employed for the determination of ascorbic acid in orange juice and drugs samples. Both modified electrodes showed an initial sensit...

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Autores principales:	MATTOS,I.L, PADILLA,F, ZAGAL,J. H, FALCAO,E.H.L, SEGURA,R
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2011
Materias:	Silver hexacyanoferrate Ascorbic acid Food and pharmaceutical sample Re-used screen printed electrodes Flow amperometry
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072011000300018
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spelling	oai:scielo:S0717-970720110003000182012-01-11SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATIONMATTOS,I.LPADILLA,FZAGAL,J. HFALCAO,E.H.LSEGURA,R Silver hexacyanoferrate Ascorbic acid Food and pharmaceutical sample Re-used screen printed electrodes Flow amperometry A flow injection system using a new and/or re-used graphite screen-printed electrode modified with silver hexacyanoferrate and a Nafion® polymer layer (AgHCF/GSPE) was employed for the determination of ascorbic acid in orange juice and drugs samples. Both modified electrodes showed an initial sensitivity of 0.015 A.cm²־.M¹־, with a linear response over the range from 50 to 300 mg L¹ , relative standard deviations smaller than 2%, detection and quantification limits of c.a. 5.0 and 25.0 mg.L¹. The response of the electrodes was stable, with no variation of base line after 6-8 hours of continuous operation. With this system it is possible to measure 65-70 samples (20μΚ) per hour. By using 1.06 mg of AgNO3, 4.12 mg of K3Fe(CN)6, 50.5 mg of KNO3 and 800μL of HNO3, it is possible to obtain between 25 and 30 modified electrodes. The proposed system showed to be inexpensive, versatile, robust and suitable for industrial application. The surface morphology of the bare and/or modified graphite screen-printed electrode was characterized by scanning electron microscopy.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.56 n.3 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072011000300018en10.4067/S0717-97072011000300018
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Silver hexacyanoferrate Ascorbic acid Food and pharmaceutical sample Re-used screen printed electrodes Flow amperometry
spellingShingle	Silver hexacyanoferrate Ascorbic acid Food and pharmaceutical sample Re-used screen printed electrodes Flow amperometry MATTOS,I.L PADILLA,F ZAGAL,J. H FALCAO,E.H.L SEGURA,R SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION
description	A flow injection system using a new and/or re-used graphite screen-printed electrode modified with silver hexacyanoferrate and a Nafion® polymer layer (AgHCF/GSPE) was employed for the determination of ascorbic acid in orange juice and drugs samples. Both modified electrodes showed an initial sensitivity of 0.015 A.cm²־.M¹־, with a linear response over the range from 50 to 300 mg L¹ , relative standard deviations smaller than 2%, detection and quantification limits of c.a. 5.0 and 25.0 mg.L¹. The response of the electrodes was stable, with no variation of base line after 6-8 hours of continuous operation. With this system it is possible to measure 65-70 samples (20μΚ) per hour. By using 1.06 mg of AgNO3, 4.12 mg of K3Fe(CN)6, 50.5 mg of KNO3 and 800μL of HNO3, it is possible to obtain between 25 and 30 modified electrodes. The proposed system showed to be inexpensive, versatile, robust and suitable for industrial application. The surface morphology of the bare and/or modified graphite screen-printed electrode was characterized by scanning electron microscopy.
author	MATTOS,I.L PADILLA,F ZAGAL,J. H FALCAO,E.H.L SEGURA,R
author_facet	MATTOS,I.L PADILLA,F ZAGAL,J. H FALCAO,E.H.L SEGURA,R
author_sort	MATTOS,I.L
title	SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION
title_short	SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION
title_full	SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION
title_fullStr	SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION
title_full_unstemmed	SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION
title_sort	screen-printed electrode modified with silver hexacy anoferrate-nafion® for ascorbic acid determination
publisher	Sociedad Chilena de Química
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072011000300018
work_keys_str_mv	AT mattosil screenprintedelectrodemodifiedwithsilverhexacyanoferratenafionforascorbicaciddetermination AT padillaf screenprintedelectrodemodifiedwithsilverhexacyanoferratenafionforascorbicaciddetermination AT zagaljh screenprintedelectrodemodifiedwithsilverhexacyanoferratenafionforascorbicaciddetermination AT falcaoehl screenprintedelectrodemodifiedwithsilverhexacyanoferratenafionforascorbicaciddetermination AT segurar screenprintedelectrodemodifiedwithsilverhexacyanoferratenafionforascorbicaciddetermination
_version_	1718445452045582336

SCREEN-PRINTED ELECTRODE MODIFIED WITH SILVER HEXACY ANOFERRATE-NAFION® FOR ASCORBIC ACID DETERMINATION

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