镍锰氧化物复合电化学传感器对抗坏血酸的检测  

Detection of ascorbic acid by a nickel-manganese oxide composite electrochemical sensor

作　　者：韩春然[1] 岳振歌 遇世友 王鑫[1] 黎晨晨[1] 张丝瑶 HAN Chunran;YUE Zhenge;YU Shiyou;WANG Xin;LI Chenchen;ZHANG Siyao(College of Food Engineering,Harbin University of Commerce,Harbin 150028,Heilongjiang,China)

机构地区：[1]哈尔滨商业大学食品工程学院,黑龙江哈尔滨150028

出　　处：《精细化工》2024年第5期1022-1029,1035,共9页Fine Chemicals

摘　　要：首先,通过一步水热法制备了镍锰氧化物复合材料(Mn-Ni-Oxide),并将其修饰玻碳电极构建抗坏血酸快速检测的电化学传感器。利用XRD、SEM、EDS及FTIR对Mn-Ni-Oxide进行了表征。采用滴涂法将Mn-Ni-Oxide修饰于电极表面,并用循环伏安(CV)法、差分脉冲伏安(DPV)法测试了抗坏血酸在Mn-Ni-Oxide修饰电极上的电化学行为。结果表明,Mn-Ni-Oxide的外表面为带有孔隙的纳米球形结构,主要组分为Mn_(2)O_(3)、NiMnO_(3)。在pH为4的乙酸/乙酸钠缓冲溶液条件下,修饰电极的Mn-Ni-Oxide修饰量为10μL,抗坏血酸浓度(c)在0.1~9000μmol/L时与氧化峰电流(I_(p))呈线性关系,线性方程为I_(p)=3.2435c+17.198(R^(2)=0.9920),检出限为0.025μmol/L,灵敏度为3.2435μA·m·L/(mol·cm)。该传感器实际应用于果汁饮料中抗坏血酸的测定,加标回收率为95.5%~103.1%,表明其在食品分析等方面具有良好的应用前景。Nickel manganese oxide composite(Mn-Ni-Oxide),prepared by one-step hydrothermal method and characterized by XRD,SEM,EDS and FTIR,was used to modify glassy carbon electrode by drop-coating method to construct an electrochemical sensor for rapid detection of ascorbic acid.The electrochemical behavior of ascorbic acid on the Mn-Ni-Oxide modified electrode was analyzed by cyclic voltammetry(CV)and differential pulse voltammetry(DPV).The results showed that the outer surface of Mn-Ni-Oxide was a porous nanosphere with the main components of Mn_(2)O_(3)and NiMnO_(3).When the acetic acid/sodium acetate buffer solution was at pH=4 and the modification amount of Mn-Ni-Oxide for the modified electrode was 10μL,the concentration(c)of ascorbic acid was linearly related to the value of oxidation peak current(I_(p))in the range of 0.1~9000μmol/L,with the linear equation of I_(p)=3.2435c+17.198(R^(2)=0.9920),the detection limit of 0.025μmol/L,and the sensitivity of 3.2435μA·m·L/(mol·cm).When applied to the determination of ascorbic acid in fruit juice,the sensor showed recoveries of spiked standards ranging from 95.5%to 103.1%,demonstrating its good prospects for application in food analysis.

关 键 词：抗坏血酸 镍锰氧化物 复合材料 电化学传感器 功能材料 

分 类 号：O657.1[理学—分析化学] TS207.3[理学—化学]