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采用电化学聚合的方法,将叶酸(FA)聚合在碳糊电极(CPE)表面,制备了聚叶酸修饰碳糊电极(PFA/CPE),并研究了肾上腺素(EP)在该修饰电极上的电化学行为。实验结果显示:在pH 7.0的磷酸盐缓冲溶液中,该聚合膜对EP的氧化有显著的催化作用,EP在修饰电极上产生2个氧化峰和一个还原峰,峰电位分别为0.193V、0.4184V和-0.252V。在测定实验条件下,EP在PFA/CPE上的氧化峰电流与其浓度在2.50×10-7～1.78×10-4mol/L范围内具有良好的线性关系,检出限可达1×10-7mol/L。将该电极应用于EP实际样品的测定,效果良好。
Polymeric folate modified carbon paste electrode (PFA / CPE) was prepared by electrochemical polymerization of FA on the surface of carbon paste electrode (CPE). The effect of epinephrine (EP) on the modified electrode Electrochemical behavior. The experimental results show that in the pH 7.0 phosphate buffer solution, the polymeric membrane has a significant catalytic effect on the oxidation of EP. EP has two oxidation peaks and one reduction peak at the modified electrode with peak potentials of 0.193V and 0.4184 V and -0.252V. Under the experimental conditions, the oxidation peak current of EP on PFA / CPE has a good linear relationship with the concentration in the range of 2.50 × 10-7 ~ 1.78 × 10-4mol / L with the detection limit of 1 × 10-7mol / L. The electrode used in the actual EP sample determination, the effect is good.