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首页> 外文期刊>International Journal of Electrochemical Science >Preparation of a Novel N,O-carboxymethyl Chitosan/Glycine- Modified Electrode and Electrochemical Determination of Uric Acid and Ascorbic Acid
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Preparation of a Novel N,O-carboxymethyl Chitosan/Glycine- Modified Electrode and Electrochemical Determination of Uric Acid and Ascorbic Acid

机译：新型N，O-羧甲基壳聚糖/甘氨酸修饰电极的制备及尿酸和抗坏血酸的电化学测定

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摘要

A N,O-carboxymethyl chitosan/glycine composite (NOCC-Gly-GC) membrane-modified electrode was prepared by coating a mixture of N,O-carboxymethyl chitosan (NOCC) and glycine (Gly) onto the surface of a glassy carbon electrode. Moreover, cyclic voltammetry was employed to characterize the electrochemical behavior of uric acid (UA) and ascorbic acid (AA) on the modified electrode. The NOCC-Gly-GC electrode was catalytically oxidized significantly, and the effective electrode area was improved with respect to that of the glassy carbon electrode. However, Gly and carboxymethyl chitosan not only increased the electrode area and active sites but also accelerated the electron transfer. In phosphate buffer solution (pH 5.59), both AA and UA were sensitive to irreversible oxidation peaks with NOCC-Gly-GC electrode. A good linear relationship between oxidation peak current and concentration was observed. After the parallel determination of mixed liquid seven times, the relative deviation ratios of AA and UA were detected to be 2.1% and 3.6%, respectively. These ratios indicated that the NOCC-Gly-GC electrode possessed electrochemical stability and reproducibility. The modified electrode exhibited well-separated oxidation peaks for UA and AA, with a potential difference of 341 mV. Thus, both simultaneous and individual measurements for UA and AA can be established. We expect the method to hold wide applications in real sample determination.
机译：通过将N，O-羧甲基壳聚糖（NOCC）和甘氨酸（Gly）的混合物涂覆到玻璃碳电极的表面来制备N，O-羧甲基壳聚糖/甘氨酸复合材料（NOCC-Gly-GC）膜修饰电极。此外，采用循环伏安法表征了修饰电极上尿酸（UA）和抗坏血酸（AA）的电化学行为。 NOCC-Gly-GC电极被显着催化氧化，相对于玻璃碳电极，有效电极面积得到了改善。然而，Gly和羧甲基壳聚糖不仅增加了电极面积和活性位点，而且还加速了电子转移。在磷酸盐缓冲溶液（pH 5.59）中，AA和UA均对NOCC-Gly-GC电极的不可逆氧化峰敏感。观察到氧化峰值电流与浓度之间的良好线性关系。平行测定混合液7次后，AA和UA的相对偏差比分别为2.1％和3.6％。这些比率表明，NOCC-Gly-GC电极具有电化学稳定性和可重复性。修饰的电极对UA和AA表现出良好的氧化峰，电位差为341 mV。因此，可以建立UA和AA的同时和单独测量。我们希望该方法在实际样品测定中具有广泛的应用。

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