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将L-半胱氨酸、纳米金、巯基乙胺修饰Cd Te量子点、噻吩-2-甲醛缩L-半胱氨酸Schiff碱镍配合物(L5-Ni)通过自组装的方式依次修饰在裸金电极的表面,制备完成的修饰电极利用循环伏安方法和电化学交流阻抗方法进行电化学表征,建立了一种快速测定饮料中柠檬黄含量的新方法,柠檬黄浓度在0~2.5 m/L范围内,阳极峰值电流与柠檬黄浓度间具有良好的线性关系,得到的线性方程为I=(-1.88×10~(-4))C-4.36×10~(-5),相关系数r为0.995,检出限为0.37 mg/L,该方法应用于饮料中柠檬黄含量的检测,相对标准偏差RSD在2.15%~3.23%,加标回收率在97.33%~104.02%之间。
The L-cysteine, gold nanoparticles, mercaptoethylamine-modified CdTe quantum dots and thiophene-2-formaldehyde L-cysteine Schiff base nickel complex (L5-Ni) were sequentially modified by self-assembly The surface of the bare gold electrode and the prepared modified electrode were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. A new method was established for the rapid determination of the lemon yellow content in the beverage. The concentration of lemon yellow was between 0 and 2.5 m / L, there is a good linear relationship between the peak current of the anode and the concentration of lemon yellow, the linear equation obtained is I = (-1.88 × 10 -4) C-4.36 × 10 -5, the correlation coefficient The detection limit was 0.995 and the limit of detection was 0.37 mg / L. The method was applied to the determination of lemon yellow in beverage. The relative standard deviations (RSDs) ranged from 2.15% to 3.23%, and the recoveries ranged from 97.33% to 104.02%.