离子液体修饰碳糊电极测定食品中香草醛  

Analysis for Vanillin in Food at Imidazole Type Carbon Ionic Liquids Modified Electrode

作　　者：陈立新[1] 李心恬[2] 方红[2] 周原[1] 

机构地区：[1]湖南工程学院化学化工学院,湖南湘潭411104 [2]深圳出入境检验检疫局工业品中心,广东深圳518045

出　　处：《现代食品科技》2013年第3期629-632,共4页Modern Food Science and Technology

基　　金：湖南省教育厅科研基金(10C0555)

摘　　要：本文合成1-丁基-3-甲基咪唑四氟硼酸[BMIM]BF4,用该离子液体构置了具更高导电效率的修饰电极。在pH=7.4的磷酸二氢钠-磷酸氢二钠缓冲溶液中,用循环伏安法和差分脉冲伏安法研究了香草醛在离子液体修饰电极和碳糊电极上的电化学行为,建立了测定香草醛的电化学方法,离子修饰电极显示了更好的电化学特性,在+0.440V(vs.SCE)左右有一个不可逆的氧化峰。DPV法线性范围2.0μg/mL^30.0μg/mL,检测限1.0μg/mL。并对香草醛的电极反应机理做了初步研究。A new kind of carbon paste electrode modified with ionic liquid BMIM BF4 was fabricated. In phosphate buffer solution （pH 7.4）, cyclic voltammetry and differential pulse voltammetry were used to investigate the electrochemical behavior of vanillin at the modified dectrode and a new method for selective detection of vanillin was established. The results showed that the electrochemical response was greatly improved with the high conductivity of ILs compared with that of traditional CPE. The vanillin showed a sensitive oxidative peak at 0.440V （VS.SCE）, and the peak current was linear to the concentration of vanillin ranging from 2.0 μg/mL-30.0μg/mL with a detection limit of 1.0μg/mL. The determination ofvanillin hydrochloride was performed and the mechanism for the electrode process was also proposed.

关 键 词：离子液体 修饰电极 香草醛 循环伏安法 差分脉冲伏安法 

分 类 号：TS207.3[轻工技术与工程—食品科学] O657.1[轻工技术与工程—食品科学与工程]