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Amperometric sensor for glucose based on electrochemically polymerized tetraruthenated nickel-porphyrin [An article from: Analytica Chimica Acta]
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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Glassy carbon and gold electrodes were modified with tetraruthenated Ni-porphyrin by electropolymerization in alkaline medium and characterized by cyclic voltammetry, UV-vis spectroscopy and MAC-mode scanning probe microscopy (SPM). The half-wave potentials and current intensities associated with the Ni^I^I^I/Ni^I^I process were strongly pH-dependent. The modified electrodes were successfully employed as sensors for glucose in alkaline medium, based on the catalytic activity of the Ni^I^I^I/Ni^I^I centers. Glucose quantification was carried out by means of cyclic voltammetry or amperometry coupled to batch injection analysis (BIA). The BIA-amperometry technique revealed more efficiency than cyclic voltammetry, lowering the detection limit to 3.6x10^-^7molL^-^1, and providing a larger, linear working range (2.5x10^-^6 to 1.0x10^-^3molL^-^1), better repeatability (RSD=1.1% for 25 injections of 2.5x10^-^5molL^-^1), and higher sampling frequency (60samplesh^-^1). The new sensor was successfully employed for the analysis of glucose in parentheral nutrition solutions and the results were in good agreement with the ones obtained by spectrophotometry, utilizing a modified Benedict's test.
Description:
Glassy carbon and gold electrodes were modified with tetraruthenated Ni-porphyrin by electropolymerization in alkaline medium and characterized by cyclic voltammetry, UV-vis spectroscopy and MAC-mode scanning probe microscopy (SPM). The half-wave potentials and current intensities associated with the Ni^I^I^I/Ni^I^I process were strongly pH-dependent. The modified electrodes were successfully employed as sensors for glucose in alkaline medium, based on the catalytic activity of the Ni^I^I^I/Ni^I^I centers. Glucose quantification was carried out by means of cyclic voltammetry or amperometry coupled to batch injection analysis (BIA). The BIA-amperometry technique revealed more efficiency than cyclic voltammetry, lowering the detection limit to 3.6x10^-^7molL^-^1, and providing a larger, linear working range (2.5x10^-^6 to 1.0x10^-^3molL^-^1), better repeatability (RSD=1.1% for 25 injections of 2.5x10^-^5molL^-^1), and higher sampling frequency (60samplesh^-^1). The new sensor was successfully employed for the analysis of glucose in parentheral nutrition solutions and the results were in good agreement with the ones obtained by spectrophotometry, utilizing a modified Benedict's test.
