基于四(5,6-二氢-1,4-二噻英)四氮杂卟啉修饰玻碳电极对多巴胺的选择性检测

(Iron(Ⅱ)-Tetra(5,6-dihydro-1,4-dithijn)Porphyrazine)-Modified Glassy Carbon Electrode for Elective Determination of Dopamine

将四(5,6-二氢-1,4-二噻英)四氮杂卟啉(FePz(dtn)4)通过电沉积的方式固载在玻碳电极上,该电极在抗坏血酸(AA)和尿酸(UA)等干扰物存在下,可选择性地检测多巴胺(DA).对比裸电极,在循环伏安测量中修饰过后的电极在氧化电位处对DA表现出良好的电催化活性.并且出现一对可逆的氧化还原峰,阳极和阴极的电位值分别为0.182V和0.142V.在电解质溶液中氧化峰电流随着DA的浓度线性增加.两个线性范围分别是1～10和10～200μg/mL,相关系数分别为0.996 7和0.998 8.检出限为0.3μg/mL.

Glassy carbon （GC） electrode was modified with an electropolymerized film of （iron（ II ）-tetra （5,6-dihydro-1,4-dithijn） porphyrazine） （FePz（dtn）4）. The polymer film-modified electrode was used to electrochemically detect dopamine （DA） in the presence of ascorbic acid （AA） and uric acid （UA）. In cyclic voltammetrie measurements, the polymer film showed an excellent eleetrocatalytic activity as the oxi- dation potential for DA was positively shifted compared to that at the bare electrode. A couple of reversible redox peaks were detected, the potential value of the anodic and the cathodic peaks being 0. 182 and 0. 142 V, respectively. The oxidation peak current increased linearly with the concentration of DA in the electrolytic solution, with a linear range of 1--10 and 10--200ug/mL and a correlation coefficient of 0. 996 7 and 0. 998 8, respectively. The detection limit was 0.3 ug/mL.