金属有机骨架材料构建环丙沙星电化学传感器的研究

本文通过水热合成法合成了钴-对苯二甲酸金属有机骨架材料Co(BDC),并将其与聚丙烯酸钠(PAAS)混合后修饰到玻碳电极(GCE)表面,制得电化学传感器Co(BDC)-PAAS/GCE,通过循环伏安法和差分脉冲法研究了传感器的响应性能,并用于水产品中环丙沙星(CIP)检测。结果表明,在碱性条件下,Co(BDC)-PAAS/GCE对CIP具有较好的电催化作用。差分脉冲峰电流与CIP浓度在3.0×10^-9~1.5×10^-8 mol/L范围内呈线性关系,线性方程为I(μA)=99.8 C_CIP+5.74(R2=0.989);在1.5×10^-8~1.5×10^-7 mol/L范围内呈线性关系,线性方程I(μA)=11.09 C_CIP+7.09(R²=0.992),检出限为1.0×10^-9mol/L。使用该传感器检测实际样品草鱼肉中CIP的加标回收率在95.0%~101.9%之间。该传感器制作简单,稳定性、选择性和重复性好,可满足水产品中CIP的快速检测需要。

Determination of Ciprofloxacin by Electrochemical Sensor Based on Metal Organic Framework Material

Cobalt-terephthalic acid metal organic framework material(Co(BDC)) was synthesized through a hydrothermal method and characterized by scanning electron microscope and infrared spectrum. The hybrid material of Co(BDC) and sodium polyacrylate(PAAS) was cast on a glassy carbon electrode(GCE) to get a modified electrode Co(BDC)-PAAS/GCE for the electrochemical detection of CIP. The electrochemical study showed that Co(BDC) exhibited high catalytic effect on the reduction of CIP. The results showed that the peak current increased with the CIP concentration in the range of 3.0×10^-9~1.5×10^-8 mol/L with a calibration equation of I(μA)=99.8C_CIP+5.74(R²=0.989), and in the range of 1.5×10^-8~1.5×10^-7 mol/L with a calibration equation of I(μA)=11.09C_CIP+7.09(R²=0.992). The detection limit is 1.0×10^(-9 )mol/L(S/N=3). The Co(BDC)-PAAS/GCE exhibited excellent reproducibility, good stability and good selectivity and was successfully applied to the determination of CIP in aquatic samples. Recoveries obtained for the determination of CIP in spiked samples were between 95.0% and 101.9%.