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
"Amperometric Determination Of Glucose In Undiluted Food Samples"
Anal. Chim. Acta
1991 Volume 242, Issue 1 Pages 91-98
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Abstract:
A sensor is described for determination of glucose. It involves glucose oxidase immobilized on to a cellulose acetate membrane through glutaraldehyde bonding. The membrane is placed over the Pt electrode of a H2O2 sensor. By placing a silanized polycarbonate membrane over the enzyme layer, the rectilinear range of the calibration graph was extended to higher concentration. The variation in response was studied as a function of pore size of the polycarbonate membrane. Response was approximately even from pH 4 to 8. The sensor was used in a flow injection system to determine 1 M glucose in soft drinks at a sampling rate of 60 h-1, and without the need for sample dilution. The coefficient of variation was 1.8% (n = 16) for 0.4 M glucose.
Glucose
Soft drink
Immobilized enzyme
pH
Cellulose acetate
"Stable Modified Electrodes For Flow Injection Amperometry. Application To The Determination Of Thiocyanate"
Anal. Chem.
1988 Volume 60, Issue 17 Pages 1710-1713
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Chem.', 'journal_id' => '0499', 'fadid' => 'ANCH1988V0060P01710', 'year' => '1988', 'volume' => '60', 'issue' => '17', 'startpage' => '1710', 'endpage' => '1713', 'type' => 'Journal Article', 'analytes' => ';2324;', 'matrices' => ';0157;', 'techniques' => ';0001;0194;0226;0333;', 'keywords' => ';0217;', 'abstract' => 'Platinum electrodes were modified by adsorption of iodine and coating with cellulose acetate, and vitreous-carbon electrodes were anodized with RuCl3 - K4Ru(CN)6. The modified electrodes were incorporated into flow injection systems for determination of SCN-. The carrier streams used for the Pt and the vitreous-carbon electrode systems were 0.2 M NaCl (adjusted to pH 4 with HCl) and 0.2 M K2SO4 (adjusted to pH 2 with H2SO4), respectively. All amperometric measurements were made vs. Ag - AgCl. Rectilinear calibration graphs were obtained for 5 µM to 0.1 mM SCN- and for 0.2 to 4.0 µM-SCN- with the Pt and vitreous-carbon electrodes, respectively. 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Chem., 1988 60(17) 1710-1713', 'firstchar' => 'S', 'twochars' => 'St', 'CitationsTechnique' => array( 'id' => '006224', 'citation_id' => '008515', 'technique_id' => '0194' ), 'Analyte' => array( (int) 0 => array( 'id' => '02324', 'name' => 'Thiocyanate ion', 'iupac_name' => 'thiocyanate', 'casrn' => '463-56-9', 'synonyms' => 'Thiocyanate; Thiocyanic acid', 'total' => '22', 'inchi' => 'InChI=1S/CHNS/c2-1-3/h3H/p-1', 'inchikey' => 'ZMZDMBWJUHKJPS-UHFFFAOYSA-M', 'formula' => 'CHNS', 'oxstate' => '-1', 'url' => '', 'charge' => '-1', 'class1' => 'Inorganic compound', 'class2' => 'NA', 'class3' => 'NA', 'class4' => 'Anion', 'class5' => '', 'isgroup' => '', 'checked' => 'yes', 'citation_count' => '0', 'updated' => '2015-10-23 21:38:16', 'first' => 'T', 'nametotal' => 'Thiocyanate ion**22', 'AnalytesCitation' => array( [maximum depth reached] ) ) ), 'Matrix' => array( (int) 0 => array( 'id' => '0157', 'label' => 'Urine', 'level1' => 'Biological fluid', 'level2' => 'urine', 'level3' => '', 'level4' => '', 'level5' => '', 'synonyms' => '', 'total' => '272', 'url' => '', 'updated' => '2015-12-09 20:50:01', 'name' => 'Biological fluid, urine', 'nametotal' => 'Biological fluid, urine**272', 'first' => 'B', 'CitationsMatrix' => array( [maximum depth reached] ) ) ), 'Keyword' => array( (int) 0 => array( 'id' => '0217', 'type' => 'Chemical Process', 'keyword' => 'Interferences', 'newKeyword' => '', 'synonyms' => '', 'fao' => '', 'total' => '1972', 'first' => 'I', 'keytotal' => 'Interferences**1972', 'CitationsKeyword' => array( [maximum depth reached] ) ) ) ) $i = (int) 1 $path = '' $a = '' $url = 'http://dx.doi.org/10.1021/ac00168a015' $aus = 'James A. Cox, Thomas Gray, and Krishnaji R. Kulkarni'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:
Platinum electrodes were modified by adsorption of iodine and coating with cellulose acetate, and vitreous-carbon electrodes were anodized with RuCl3 - K4Ru(CN)6. The modified electrodes were incorporated into flow injection systems for determination of SCN-. The carrier streams used for the Pt and the vitreous-carbon electrode systems were 0.2 M NaCl (adjusted to pH 4 with HCl) and 0.2 M K2SO4 (adjusted to pH 2 with H2SO4), respectively. All amperometric measurements were made vs. Ag - AgCl. Rectilinear calibration graphs were obtained for 5 µM to 0.1 mM SCN- and for 0.2 to 4.0 µM-SCN- with the Pt and vitreous-carbon electrodes, respectively. However, the latter electrode was stable for longer than the Pt electrode. The method was applied in the determination of SCN- in urine; interference from uric and ascorbic acids was removed by controlled-potential electrolysis before analysis.
Thiocyanate ion
Urine
Interferences