College of Chemistry and Chemical Engineering, Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, Northwest Normal University, Lanzhou 730070, PR China.
Talanta. 2012 Sep 15;99:984-8. doi: 10.1016/j.talanta.2012.07.077. Epub 2012 Aug 8.
A promising electrochemical sensor for simultaneous determination of dopamine (DA), uric acid (UA) and ascorbic acid (AA) was fabricated based on the stacked graphene platelet nanofibers (SGNF)/ionic liquid (IL)/chitosan (CS) modified electrode. The SGNF/IL/CS modified electrode possessed excellent electrocatalytic activity towards the oxidation of DA, UA and AA with obvious reduction of over-potential and increased peak current, and the separations of oxidation peak potentials of DA-UA, DA-AA, and UA-AA were of 151, 213 and 364 mV, respectively. Under the optimum conditions, the linear range for the detection of DA, UA and AA were 0.05-240, 0.12-260, and 30-350 μM with the lowest detection limits of 0.05, 0.10 and 14.8 μM for DA, UA and AA, respectively. In addition, the electrochemical sensor showed high sensitivity, excellent selectivity, reproducibility and long-term stability.
基于堆叠石墨烯片层纳米纤维（SGNF）/离子液体（IL）/壳聚糖（CS）修饰电极，构建了一种用于同时测定多巴胺（DA）、尿酸（UA）和抗坏血酸（AA）的电化学传感器。SGNF/IL/CS 修饰电极对 DA、UA 和 AA 的氧化具有优异的电催化活性，显著降低了过电势并增加了峰电流，DA-UA、DA-AA 和 UA-AA 的氧化峰电位分离分别为 151、213 和 364 mV。在最佳条件下，该电化学传感器对 DA、UA 和 AA 的检测线性范围分别为 0.05-240、0.12-260 和 30-350 μM，DA、UA 和 AA 的最低检测限分别为 0.05、0.10 和 14.8 μM。此外，该电化学传感器还表现出高灵敏度、优异的选择性、重现性和长期稳定性。
