摘要
制作了溴代十六烷基吡啶修饰碳糊电极，研究了咖啡酸在该修饰碳糊电极上的电化学行为。在0．1mol．L^-1的HAc-NaAc缓冲溶液（PH=3．0）中，咖啡酸在峰电位为0．44V（vs．SCE）左右出现一灵敏的氧化峰，通过选择和优化各项参数，建立了一种直接测定咖啡酸的电分析方法。该方法的线性范围为1．55×10^-5～4．16×10^-7mol．L^-1，检出限为2．0×10^-8mol．L^-1（富集min）。该修饰电极制作简单，稳定性、重现性良好，可用于药物中咖啡酸含量的则定。
A Cetyl cetyl pyridine bromide（CPB） modified carbon paste electrode was fabricated. A new method for determination of eaffeie acid was presented based on eetyl pyridine bromide modified carbon paste electrode. It is found that CPB significantly enhances the stripping peak current of eaffeie acid. All the experimental parameters were optimized and a sensitive electrochemical method was developed for the determination of eaffeie acid. The stripping peak current is proportional to the concentration of eaffeie acid from 5.55×10^-4 to 4.16×10^-6 mol.L^-1. The detection limit is about 2.0×10^-8 mol.L^-1 for 4 min accumulation. The proposed method was demonstrated by using eaffeie acid table.
出处
《福建分析测试》
CAS
2007年第1期19-22,共4页
Fujian Analysis & Testing
基金
湖北省教育厅重点项目(D200529005)
关键词
溴代十六烷基吡啶
咖啡酸
化学修饰电极
伏安测定
carbon paste electrode
caffeic acid
cetyl pyridine bromide modified electrode
volt - ampere determination
