Contact Info
Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf
Electrode
Citations 2
"Static And Flow Injection Voltammetric Determination Of Periodate By Reduction At A Rotating Platinum Wire Electrode"
Anal. Chim. Acta
1994 Volume 292, Issue 1 Pages 99-105
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Abstract:
In the static system a three-electrode cell was used, consisting of a rotating Pt-wire electrode, an auxiliary Pt electrode and an SCE reference electrode. Measurements were made in phosphate buffer solution of pH 7-7.5 by scanning the potential between +1.3 and -0.7 V (vs. SCE) with the electrode rotating at 750 rpm. The calibration graph was linear from 50-420 µM-periodate. In the flow system, sample solution (20-100 µL) was injected into a phosphate buffer pH 7 carrier stream (1 ml/min) and this was passed into a specially-designed three-electrode flow cell (illustrated) with an internal volume of 600 µL, and the peak reduction current was measured at an applied potential of -0.07 V (vs. SCE). The calibration graph was linear for 10^-100 µM-periodate and the sample throughput was 15-40 samples/h depending on the injection volume.
Periodate
"Determination Of Thiols By Hydrodynamic Modulation Voltammetry"
Bunseki Kagaku
1987 Volume 36, Issue 10 Pages 628-631
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Chem., Takatsuki, Osaka 569 Japan', 'email' => 'NA', 'notes' => null, 'url' => '10.2116/bunsekikagaku.36.10_628', 'urltype' => 'doi', 'gotpdf' => 'yes', 'partial' => 'no', 'notanalyte' => '', 'citation' => ''Determination of thiols by hydrodynamic modulation voltammetry', Bunseki Kagaku, 1987 36(10) 628-631', 'firstchar' => 'D', 'twochars' => 'De', 'CitationsTechnique' => array( 'id' => '011386', 'citation_id' => '011574', 'technique_id' => '0204' ), 'Analyte' => array( (int) 0 => array( 'id' => '00734', 'name' => 'Cysteine', 'iupac_name' => '(2R)-2-amino-3-sulfanylpropanoic acid', 'casrn' => '52-90-4', 'synonyms' => 'Cysteine, L-; β-Mercaptoalanine; Cystein; Cysteine; Half-cystine; L-(+)-Cysteine; L-Alanine, 3-mercapto-; NSC-8746; Propanoic Acid, 2-amino-3-mercapto-, (R)-; Thioserine; (R)-2-Amino-3-mercaptopropanoic acid; (+)-2-Amino-3-mercaptopropionic acid; α-Amino-β-thiolpropionic acid', 'total' => '30', 'inchi' => 'InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1', 'inchikey' => 'XUJNEKJLAYXESH-REOHCLBHSA-N', 'formula' => 'C3H7NO2S', 'oxstate' => 'Zero', 'url' => '', 'charge' => '0', 'class1' => 'Biological', 'class2' => 'NA', 'class3' => 'NA', 'class4' => 'Molecule', 'class5' => 'Amino acids', 'isgroup' => '', 'checked' => 'yes', 'citation_count' => '0', 'updated' => '2015-12-11 16:39:45', 'first' => 'C', 'nametotal' => 'Cysteine**30', 'AnalytesCitation' => array( [maximum depth reached] ) ), (int) 1 => array( 'id' => '00737', 'name' => 'N-acetylcysteine', 'iupac_name' => '(2R)-2-acetamido-3-sulfanylpropanoic acid', 'casrn' => 'Na', 'synonyms' => 'NA', 'total' => '8', 'inchi' => 'InChI=1S/C5H9NO3S/c1-3(7)6-4(2-10)5(8)9/h4,10H,2H2,1H3,(H,6,7)(H,8,9)/t4-/m0/s1', 'inchikey' => 'PWKSKIMOESPYIA-BYPYZUCNSA-N', 'formula' => 'C3H7NO2S ', 'oxstate' => 'Zero', 'url' => '', 'charge' => '0', 'class1' => 'Biological', 'class2' => 'NA', 'class3' => 'NA', 'class4' => 'Molecule', 'class5' => 'Amino acids', 'isgroup' => '', 'checked' => 'yes', 'citation_count' => '0', 'updated' => '2015-10-23 09:56:06', 'first' => 'N', 'nametotal' => 'N-acetylcysteine**8', 'AnalytesCitation' => array( [maximum depth reached] ) ), (int) 2 => array( 'id' => '02351', 'name' => 'Dithiothreitol', 'iupac_name' => '(2S,3S)-1,4-bis(sulfanyl)butane-2,3-diol', 'casrn' => '3483-12-3', 'synonyms' => '2,3-Butanediol, 1,4-dimercapto-, (R*,R*)-; Dithiothreitol; DTT; (R,R)-1,4-Dimercapto-2,3-butanediol; (R,R)-Dithiothreitol', 'total' => '1', 'inchi' => 'InChI=1S/C4H10O2S2/c5-3(1-7)4(6)2-8/h3-8H,1-2H2/t3-,4-/m0/s1', 'inchikey' => 'VHJLVAABSRFDPM-QWWZWVQMSA-N', 'formula' => 'C4H10O2S2', 'oxstate' => 'Zero', 'url' => '', 'charge' => '0', 'class1' => 'Organic compound', 'class2' => 'NA', 'class3' => 'NA', 'class4' => 'Molecule', 'class5' => '', 'isgroup' => '', 'checked' => 'yes', 'citation_count' => '0', 'updated' => '2015-10-23 21:38:28', 'first' => 'D', 'nametotal' => 'Dithiothreitol**1', 'AnalytesCitation' => array( [maximum depth reached] ) ), (int) 3 => array( 'id' => '00933', 'name' => '2-Mercaptoethanol', 'iupac_name' => '2-sulfanylethanol', 'casrn' => '60-24-2', 'synonyms' => '?-Hydroxyethanethiol; ?-Hydroxyethylmercaptan; ?-Mercaptoethanol; Ethylene glycol, monothio-; Monothioethylene glycol; Monothioglycol; Thioethylene glycol; Thioglycol; Thiomonoglycol; 1-Ethanol-2-thiol; 1-Hydroxy-2-mercaptoethane; 1-Mercapto-2-hydroxyethane; 2-Hydroxy-1-ethanethiol; 2-Hydroxyethanethiol; 2-Hydroxyethyl mercaptan; 2-Mercapto-1-ethanol; 2-Mercaptoethanol; 2-Mercaptoethyl alcohol; 2-ME; Hydroxyethyl mercaptan; Mercaptoethanol; USAF ek-4196; 2-Thioethanol; Emery 5791; UN 2966; Sipomer 2ME; 2-Sulfanylethanol', 'total' => '1', 'inchi' => 'InChI=1S/C2H6OS/c3-1-2-4/h3-4H,1-2H2', 'inchikey' => 'DGVVWUTYPXICAM-UHFFFAOYSA-N', 'formula' => 'C2H6OS', 'oxstate' => 'Zero', 'url' => '', 'charge' => '0', 'class1' => 'Organic compound', 'class2' => 'NA', 'class3' => 'NA', 'class4' => 'Molecule', 'class5' => '', 'isgroup' => '', 'checked' => 'yes', 'citation_count' => '0', 'updated' => '2015-10-23 09:57:40', 'first' => '2', 'nametotal' => '2-Mercaptoethanol**1', 'AnalytesCitation' => array( [maximum depth reached] ) ), (int) 4 => array( 'id' => '02328', 'name' => 'Thiols', 'iupac_name' => '', 'casrn' => '', 'synonyms' => 'NA', 'total' => '19', 'inchi' => 'InChI=1S/H2S/h1H2', 'inchikey' => '', 'formula' => 'SH', 'oxstate' => null, 'url' => '', 'charge' => null, 'class1' => 'Organic compound', 'class2' => 'NA', 'class3' => 'NA', 'class4' => 'Molecule', 'class5' => '', 'isgroup' => '', 'checked' => 'yes', 'citation_count' => '0', 'updated' => '2015-12-11 09:53:17', 'first' => 'T', 'nametotal' => 'Thiols**19', 'AnalytesCitation' => array( [maximum depth reached] ) ) ), 'Matrix' => array(), 'Keyword' => array() ) $i = (int) 1 $path = '' $a = '' $url = 'http://dx.doi.org/10.2116/bunsekikagaku.36.10_628' $aus = 'Yamaguchi, S.;Tsukamoto, T.;Senda, M.'include - APP/View/Elements/citation.ctp, line 40 View::_evaluate() - CORE/Cake/View/View.php, line 971 View::_render() - CORE/Cake/View/View.php, line 933 View::_renderElement() - CORE/Cake/View/View.php, line 1224 View::element() - CORE/Cake/View/View.php, line 418 include - APP/View/Techniques/view.ctp, line 52 View::_evaluate() - CORE/Cake/View/View.php, line 971 View::_render() - CORE/Cake/View/View.php, line 933 View::render() - CORE/Cake/View/View.php, line 473 Controller::render() - CORE/Cake/Controller/Controller.php, line 968 Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200 Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167 [main] - APP/webroot/index.php, line 109
Abstract:
Square-wave hydrodynamic modulation voltammetry with a vibrating platinum-wire electrode was applied to the flow injection determination of thiols, e.g., cysteine, N-acetylcysteine, dithiothreitol, 2-mercaptoethanol and reduced glutathione. A carrier stream (0.2 mL min-1) of 0.1 M phosphate buffer (pH 3) was used. The electrode was vibrated between 0 and 60 Hz over 2 s and the modulation current vs. potential curve and the difference modulation current vs. potential curve showed a max. between +0.7 and +0.9 V vs. a SCE. The difference current measured at +0.65 V increased rectilinearly between 0 and 0.1 mM thiol. Thiols were determined at the 1 µM level with the exception of reduced glutathione, which gave an unexpectedly small modulation current.
Cysteine
N-acetylcysteine
Dithiothreitol
2-Mercaptoethanol
Thiols