食品科学 ›› 2020, Vol. 41 ›› Issue (16): 151-157.doi: 10.7506/spkx1002-6630-20190409-114

• 成分分析 • 上一篇    

基于金磁微粒模拟酶电化学增强体系检测抗坏血酸

龚德状,关桦楠,吴巧艳,宋岩,刘博,杨帆,张娜   

  1. (哈尔滨商业大学食品工程学院,黑龙江 哈尔滨 150076)
  • 发布日期:2020-08-19
  • 基金资助:
    国家自然科学基金面上项目(31370649);国家自然科学基金青年科学基金项目(31201376); 黑龙江省自然科学基金项目(C2016034); 黑龙江省普通本科高等学校青年创新人新才培养计划项目(UNPYSCT-2016060); 中国博士后基金资助项目(2014T70304;2013M531009);黑龙江省博士后资助项目(LBH-Z13002); 哈尔滨商业大学科研项目(17XN026); 哈尔滨商业大学研究生创新科研资金项目(YJSCX2017-462HSD;YJSCX2018-538HSD)

Enzyme-like Activity of Gold-Magnetic Nanocomposite Particles for Enhanced Electrochemcial Detection of Ascorbic Acid

GONG Dezhuang, GUAN Huanan, WU Qiaoyan, SONG Yan, LIU Bo, YANG Fan, ZHANG Na   

  1. (College of Food Engineering, Harbin University of Commerce, Harbin 150076, China)
  • Published:2020-08-19

摘要: 通过自组装方法构建金磁微粒(Fe3O4@Au)复合纳米粒子,并表征其理化性能。基于复合纳米粒子的过氧化物模拟酶活性,构建出具有高灵敏度和选择性检测抗坏血酸的无酶增强型电化学传感器。采用循环伏安法对抗坏血酸进行测定,并优化电化学检测体系。结果表明,在最适检测体系下,所构建的无酶电化学传感器对抗坏血酸检测具有较高的灵敏度,抗坏血酸浓度在1~100 mmol/L范围内,电流响应与其具有良好线性关系,工作曲线方程为y=867.81x+3.860 8(R2=0.991 9),检出限为0.011 7 mg/L。此外,所构建的无酶电化学传感器已成功地应用于实际样品检测。鉴于此,所提出的新型无酶电化学分析方法在食品质量控制和安全检测等领域有着巨大的应用前景。

关键词: 金磁微粒;模拟酶;抗坏血酸;电化学检测;循环伏安

Abstract: In this research, gold magnetic nanoparticles (Fe3O4@Au) were formed by self-assembling method. Its physical and chemical properties were characterized. A highly sensitive and selective enzyme-free enhanced electrochemical sensor based on the peroxidase-like activity of composite nanoparticles was prepared for the detection of ascorbic acid (AA). Electrochemical cyclic voltammetry (CV) was used to measure AA and the electrochemical detection system was optimized. The results showed that the established enzyme-free electrochemical sensor showed an extremely high sensitivity towards AA under the optimized conditions, with a good linear relationship between the current response (y) and the concentration of AA (x) in the range of 1–100 mmol/L, which was fitted with the equation: y = 867.81x + 3.860 8 (R2 = 0.991 9), and the detection limit was 0.011 7 mg/L. In addition, the electrochemical sensor was successfully applied in the detection of AA in real samples. In view of this, the proposed new enzyme-free electrochemical assay has great potential in the fields of food quality control and safety detection.

Key words: gold magnetic particles; enzyme-like activity; ascorbic acid; electrochemical detection; cyclic voltammetry

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