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
"Development Of An Interferent Free Amperometric Biosensor For Determination Of L-lysine In Food"
Anal. Chim. Acta
2000 Volume 412, Issue 1-2 Pages 111-119
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Abstract:
A highly selective, fast responding amperometric biosensor is described, useful for the determination of L-lysine in food. Common electrochemical interferences, like acetoaminophen and ascorbic acid have zero response at +100 mV applied onto a ruthenium/rhodium coated glassy carbon electrode covered with 1,2-diaminobenzene polymer. This novel transducer was coupled with L-lysine α-oxidase purified from Trichoderma viride and at the appropriate pH, classic substrate interferences from L-ornithine, L-arginine and L-phenylalanine are reduced to 3.4, 1.1 and 0.7% of the response to L-lysine (taken as 100%). No other amino acids respond. The sensor is inexpensive to produce, has excellent repeatability and very good reproducibility. Thus, the L-lysine (protein) content of foods can be almost specifically determined following rapid microwave digestion of the product.
l-Lysine
Food
Interferences
Detector
"Electrochemical Metalization Of Carbon Electrodes"
Anal. Chim. Acta
1998 Volume 373, Issue 2-3 Pages 261-270
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Other electroactive species gave low responses at these potentials. The main problem encountered with such metalized electrodes is the lack of stability of their catalytic properties. The modified electrode with the greatest stability is a codeposited ruthenium and rhodium surface. After an initial drop-off in response, the electrodes remained stable for over two months. Twenty replicate injections gave a response of 0.63 µA to 1 mM H2O2 at an applied voltage of 67 mV vs. Ag/AgCl and the relative standard deviation was 0.78%. 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The resultant chemical modified electrodes were amperometrically tested for catalytic activity towards the oxidation and reduction of hydrogen peroxide (H2O2). Their behavior was characterized by plotting current response to H2O2 vs. the applied potential. An unusual property found in the case of both ruthenium and rhodium was their capacity to reduce hydrogen peroxide atpositive potentials. This leads to the possibility of measuring large reduction currents at lowpositive potentials. Other electroactive species gave low responses at these potentials. The main problem encountered with such metalized electrodes is the lack of stability of their catalytic properties. The modified electrode with the greatest stability is a codeposited ruthenium and rhodium surface. After an initial drop-off in response, the electrodes remained stable for over two months. Twenty replicate injections gave a response of 0.63 µA to 1 mM H2O2 at an applied voltage of 67 mV vs. Ag/AgCl and the relative standard deviation was 0.78%. The 3s limit of detection is 5 x 10^-8 M hydrogen peroxide.', 'language' => 'English', 'updated' => '2015-10-26 09:47:56', 'sjccheck' => 'Yes', 'sjccheckdate' => '0000-00-00 00:00:00', 'hits' => '13', 'urlcheck' => '2014-10-11 16:28:28', 'urlcheckcode' => 'HTTP/1.1 302 Found', 'pauthor_id' => '00180', 'pauthor' => '!Guilbault, G.G.', 'address' => 'pau', 'email' => 'pau', 'notes' => 'Tel.: +353-21-902403; fax: +353-21-274097', 'url' => '10.1016/S0003-2670(98)00414-0', 'urltype' => 'doi', 'gotpdf' => 'yes', 'partial' => 'no', 'notanalyte' => '', 'citation' => ''Electrochemical metalization of carbon electrodes', Anal. Chim. Acta, 1998 373(2-3) 261-270', 'firstchar' => 'E', 'twochars' => 'El', 'CitationsTechnique' => array( [maximum depth reached] ), 'Analyte' => array( [maximum depth reached] ), 'Matrix' => array([maximum depth reached]), 'Keyword' => array( [maximum depth reached] ) ) ) ) $c = array( 'id' => '006649', 'authors' => 'O'Connell, P.J.;O'Sullivan, C.K.;Guilbault, G.G.', 'authorsweb' => 'P. J. O'Connell, C. K. O'Sullivan and G. G. Guilbault', 'title' => 'Electrochemical metalization of carbon electrodes', 'journal' => 'Anal. Chim. Acta', 'journal_id' => '0584', 'fadid' => 'ANCA1998V0373P00261', 'year' => '1998', 'volume' => '373', 'issue' => '2-3', 'startpage' => '261', 'endpage' => '270', 'type' => 'Journal Article', 'analytes' => ';1196;', 'matrices' => '', 'techniques' => ';0237;0001;', 'keywords' => ';0043;0110;0067;', 'abstract' => 'Transition metals were electrodeposited on glassy carbon electrodes using cyclic voltammetry. The resultant chemical modified electrodes were amperometrically tested for catalytic activity towards the oxidation and reduction of hydrogen peroxide (H2O2). Their behavior was characterized by plotting current response to H2O2 vs. the applied potential. An unusual property found in the case of both ruthenium and rhodium was their capacity to reduce hydrogen peroxide atpositive potentials. This leads to the possibility of measuring large reduction currents at lowpositive potentials. Other electroactive species gave low responses at these potentials. The main problem encountered with such metalized electrodes is the lack of stability of their catalytic properties. The modified electrode with the greatest stability is a codeposited ruthenium and rhodium surface. After an initial drop-off in response, the electrodes remained stable for over two months. Twenty replicate injections gave a response of 0.63 µA to 1 mM H2O2 at an applied voltage of 67 mV vs. Ag/AgCl and the relative standard deviation was 0.78%. The 3s limit of detection is 5 x 10^-8 M hydrogen peroxide.', 'language' => 'English', 'updated' => '2015-10-26 09:47:56', 'sjccheck' => 'Yes', 'sjccheckdate' => '0000-00-00 00:00:00', 'hits' => '13', 'urlcheck' => '2014-10-11 16:28:28', 'urlcheckcode' => 'HTTP/1.1 302 Found', 'pauthor_id' => '00180', 'pauthor' => '!Guilbault, G.G.', 'address' => 'pau', 'email' => 'pau', 'notes' => 'Tel.: +353-21-902403; fax: +353-21-274097', 'url' => '10.1016/S0003-2670(98)00414-0', 'urltype' => 'doi', 'gotpdf' => 'yes', 'partial' => 'no', 'notanalyte' => '', 'citation' => ''Electrochemical metalization of carbon electrodes', Anal. Chim. 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Abstract:
Transition metals were electrodeposited on glassy carbon electrodes using cyclic voltammetry. The resultant chemical modified electrodes were amperometrically tested for catalytic activity towards the oxidation and reduction of hydrogen peroxide (H2O2). Their behavior was characterized by plotting current response to H2O2 vs. the applied potential. An unusual property found in the case of both ruthenium and rhodium was their capacity to reduce hydrogen peroxide atpositive potentials. This leads to the possibility of measuring large reduction currents at lowpositive potentials. Other electroactive species gave low responses at these potentials. The main problem encountered with such metalized electrodes is the lack of stability of their catalytic properties. The modified electrode with the greatest stability is a codeposited ruthenium and rhodium surface. After an initial drop-off in response, the electrodes remained stable for over two months. Twenty replicate injections gave a response of 0.63 µA to 1 mM H2O2 at an applied voltage of 67 mV vs. Ag/AgCl and the relative standard deviation was 0.78%. The 3s limit of detection is 5 x 10^-8 M hydrogen peroxide.
Hydrogen peroxide
Apparatus
Detector
Catalysis