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目的依据文献先合成离子液体基金纳米流体(ILAu NFs),再采用滴涂法将合成的离子液体基金纳米流体固定在玻碳电极表面,构建测定多巴胺(DA)的电化学传感器。方法采用循环伏安法(CV)研究DA在修饰电极上的电化学行为,以差示脉冲伏安法(DPV)建立测定DA的方法。结果在p H=7.0的磷酸缓冲溶液(PBS)中,ILAu NFs对DA具有明显的电催化作用,DA在修饰电极上呈现一对峰形良好的氧化还原峰;与裸电极相比,DA在修饰电极上的氧化峰电位负移113 m V,峰电位差△Ep由219 m V减小至64 m V,可逆性明显变好,而且峰电流明显增加。在优化的实验条件下,DA氧化峰的电流与其浓度在4.0×10-6mol/L~1.0×10-4mol/L呈良好的线性关系,检出限为1.32×10-7mol/L。结论建立的测定DA的电化学新方法可用于实际样品盐酸多巴胺注射液中DA含量的测定,结果令人满意。
OBJECTIVE To synthesize ILAu NFs according to the literature, and then use a drop-coating method to immobilize the synthesized ILF nanofluid on the surface of the glassy carbon electrode to construct an electrochemical sensor for the determination of dopamine (DA). Methods The electrochemical behavior of DA at modified electrode was investigated by cyclic voltammetry (CV), and the method of determining DA was established by differential pulse voltammetry (DPV). Results ILAu NFs showed obvious electrocatalysis on DA in pH = 7.0 phosphate buffered saline (PBS). DA showed a good pair of redox peaks at the modified electrode. Compared with the bare electrode, DA The potential of the oxidation peak at the modified electrode is negative shifted by 113 mV, and the peak potential difference Ep is reduced from 219 mV to 64 mV. The reversibility is obviously better and the peak current is obviously increased. Under the optimized experimental conditions, the current of DA oxidation peak showed a good linear relationship with the concentration of 4.0 × 10-6mol / L to 1.0 × 10-4mol / L with the detection limit of 1.32 × 10-7mol / L. Conclusions The established new electrochemical method for the determination of DA can be used to determine the DA content in the actual sample of dopamine hydrochloride injection with satisfactory results.