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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Determination of Tyrosine and Nitrite Using CS/CMWNTs/GCE-modified Electrode
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Electrochemical Determination of Tyrosine and Nitrite Using CS/CMWNTs/GCE-modified Electrode

机译：CS / CMWNT / GCE改性电极电化学测定酪氨酸和亚硝酸盐

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摘要

A novel electrode was successfully made by modifying a glassy carbon electrode (GCE) with a chitosan (CS)/carboxylated multi-walled carbon nanotube (CMWNT) composite. The electrochemical - behavior of L-tyrosine (L-Tyr) and nitrite (NO2 ) was investigated using cyclic voltammetry, and the - detection conditions of L-Tyr and NO2 were explored. The effective area of the CS/CMWNTs/GCE was calculated to be 7.2534 × 10-6 cm2. The surface area of the electrode membrane surface increased significantly. Accelerating the electron transfer of K3[Fe(CN)6] is beneficial for the adsorption and enrichment of the measured substance. The results showed that the amperometric response of the sensor reached a maximum when the pH of phosphate-buffered saline (PBS) was 3.6 and 4.7 for L-Tyr - - and NO2 , respectively. The modified electrode could detect L-Tyr and NO2 in the linear concentration ranges of 1.0 × 10-8–2.0 M and 1.5 × 10-8–0.3 M, respectively. The detection limits were 1.6 × 10-9 M -9 - and 2.1 × 10 for L-Tyr and NO2 , respectively (S/N = 3). These results demonstrate the high stability and reproducibility of detection, obtained using the CS/CMWNTs/GCE. The modified electrode was - applied to determine the L-Tyr content of amino acid injections and the NO2 content of salted radish.
机译：通过用壳聚糖（CS）/羧化多壁碳纳米管（CMWNT）复合材料改变玻璃碳电极（GCE）来成功制备一种新型电极。使用循环伏安法研究了L-酪氨酸（L-TYR）和亚硝酸盐（NO2）的电化学 - 探讨了L-TYR和NO2的检测条件。 CS / CMWNT / GCE的有效面积计算为7.2534×10-6cm 2。电极膜表面的表面积显着增加。加速K3 [Fe（CN）6]的电子转移是有益于吸附和富集测量物质的。结果表明，当磷酸盐缓冲盐水（PBS）的pH为3.6和4.7分别为L-Tyr-and2而达到最大值。改性电极可以分别检测L-Tyr和NO 2，分别为1.0×10-8-2.0 m和1.5×10-8-0.3m的线性浓度范围。对于L-TYR和NO2，检测限为1.6×10-9 m -9 - 和2.1×10（s / n = 3）。这些结果证明了使用CS / CMWNT / GCE获得的检测的高稳定性和再现性。施用于修饰的电极以确定氨基酸注射的L-Tyr含量和盐渍萝卜的NO 2含量。

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