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• W2083747589 abstract "We report on the catalytic electrooxidation of 2-mercaptoethanol on ultramicro-carbon-fiber electrode (UMCF) modified with overoxidized polypyrrole-doped cobalt-tetrasulfonated phthalocyanine (CoTSPc) film. The easily prepared electrodes are stable and do not passivate after repetitive use. The sensitivity of the modified UMCF electrode towards the amperometric detection of 2-mercaptoethanol was tested with differential pulse voltammetry (DPV) and differential normal pulse amperometry (DNPA). A calculated detection limit as low as 8610 ˇ5 M was obtained by DPV. Our results show that UMCF electrodes are promising for the detection of low concentrations of thiols as mass transport limitations are minimized. The detection of thiol-derivated substances is an important field of research as they can be present as contaminants in fuels (1) and biological fluids (2) and they may be useful as markers of food deterioration (3, 4). During the last decade, several authors (5-17) have reported the catalytic electrooxidation of various thiols on electrodes modified with metallophthalocyanines. In general, electrodes of this type can be used as sensors (15-25) and various configurations have been developed such as carbon paste (15-17) and screen-printed carbon electrodes (19-25) containing cobalt phthalocyanines and derivatives. The advantage of the reported cobalt phthalocyanine-based electrodes is that the thiols (namely 2-mercaptoethanol, L-cysteine, reduced gluthathione etc.) can be monitored at considerable lower potentials compared with the nonmodified electrodes. Superior selectivity and sensitivity were also achieved. We and others have reported that much advantage can be obtained from the activity of cobalt phthalocyanines if they are electropolymerized forming conductive films that coat an electrode surface (14, 18), or if they are dispersed within a conductive polymeric matrix (12, 13). In addition, such an approach should allow the conception of various shapes and geometrical designs of electrode surfaces and a better control of their modification. In this work, we combine for the first time the use of electrochemically formed polypyrrole-doped cobalt tetra- sulfonated phthalocyanine (CoTSPc) with ultramicro-carbon-fiber electrode configuration (UMCF) to achieve the electrocatalytic oxidation of 2-mercaptoethanol (2-ME) in alkaline aqueous solu- tion and provide a miniaturized electrochemical sensor that is easily fabricated from low cost materials, providing an ultramicroprobe that may be developed for applications in biological systems. We have selected 2-ME as the examined analyte target since its elec- potential scan between ˇ0.2 and 0.7 V, at room temperature, starting at the lower potential limit. The incorporation of CoTSPc within the polypyrrole matrix (PPy) is based on the ion exchange properties of the oxidized polymer (26): the multianionic tetra- sulfonated cobalt phthalocyanine molecules are introduced into polypyrrole film as counterions (or ''doping'' ions) during the electrochemical growth of the polymer matrix. Note that in this operation, only CoTSPc was used as supporting electrolyte. The obtained film is denoted as PPy=CoTSPc. In order to avoid having a large electrical charge in the potentiodynamic response of the polypyrrole-based electrodes which creates a large background current that hinder the characterization of the electrocatalytic effects of the complex, the polymer was overoxidized by succes- sive potential scans betweenˇ0.2 and 0.4 V in 0.1 M NaOH (in the absence of pyrrole monomers) until the total suppression of its electroactivity. The obtained modified UMCF electrode is then denoted as OPPy=CoTSPc. In general, these electrodes are much more stable than those obtained by simple adsorption of phtha- locyanine monolayers on carbon or graphite surfaces since the" @default.
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• W2083747589 date "2001-09-01" @default.
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• W2083747589 title "Overoxidized Polypyrrole/Cobalt Tetrasulfonated Phthalocyanine Modified Ultramicro‐Carbon‐Fiber Electrodes for the Electrooxidation of 2‐Mercaptoethanol" @default.
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