کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
745381 | 894419 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Simultaneous determination of epinephrine and ascorbic acid at the electrochemical sensor of triazole SAM modified gold electrode Simultaneous determination of epinephrine and ascorbic acid at the electrochemical sensor of triazole SAM modified gold electrode](/preview/png/745381.png)
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.
Journal: Sensors and Actuators B: Chemical - Volume 113, Issue 1, 17 January 2006, Pages 156–161