Simultaneous determination of epinephrine and ascorbic acid at the electrochemical sensor of triazole SAM modified gold electrode |
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| Affiliation: | 1. Engineering School, Mackenzie Presbyterian University, 01302-907 São Paulo, SP, Brazil;2. Institute of Chemistry, University of São Paulo, 05508-000, São Paulo, SP, Brazil;3. Institute of Chemistry, University of São Paulo, 13560-970 São Carlos, SP, Brazil;1. School of Chemistry, Faculty of Sciences, Shoolini University, Bajhol, Solan, (H.P) PIN 173229, India;2. Department of Physics, Southern University of Science and Technology, 518055 Shenzen, China;3. Department of Environment Science, Central University of Himachal Pradesh, Dharamshala, Kangra, (H.P), India;4. Department of Chemistry, DAV College, Sector-10, Chandigarh 160010, India;5. Department of Chemistry and Chemical Sciences, Central University of Himachal Pradesh, Dharamshala, Kangra, (H.P), India;1. National Institute for Research and Development in Electrochemistry and Condensed Matter, 1, Plautius Andronescu Street, 300224 Timisoara, Romania;2. Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Avenue 24, 300223 Timisoara, Romania;3. Politehnica University of Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Victoriei Square 2, 300006 Timisoara, Romania |
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| Abstract: | The electrochemical sensor of triazole (TA) self-assembled monolayer (SAM) modified gold electrode (TA SAM/Au) was fabricated. The electrochemical behaviors of epinephrine (EP) at TA SAM/Au have been studied. The TA SAM/Au shows an excellent electrocatalytic activity for the oxidation of EP and accelerates electron transfer rate. The diffusion coefficient is 1.135 × 10?6 cm2 s?1. Under the optimum experiment conditions (i.e. 0.1 mol L?1, pH 4.4, sodium borate buffer, accumulation time: 180 s, accumulation potential: 0.6 V, scan rate: 0.1 Vs?1), the cathodic peak current of EP versus its concentration has a good linear relation in the ranges of 1.0 × 10?7 to 1.0 × 10?5 mol L?1 and 1.0 × 10?5 to 6.0 × 10?4 mol L?1 by square wave adsorptive stripping voltammetry (SWASV), with the correlation coefficient of 0.9985 and 0.9996, respectively. Detection limit is down to 1.0 × 10?8 mol L?1. The TA SAM/Au can be used for the determination of EP in practical injection. Meantime, the oxidative peak potentials of EP and ascorbic acid (AA) are well separated about 200 ± 10 mV at TA SAM/Au, the oxidation peak current increases approximately linearly with increasing concentration of both EP and AA in the concentration range of 2.0 × 10?5 to 1.6 × 10?4 mol L?1. It can be used for simultaneous determination of EP and AA. |
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