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    栗云鹏, 施玉峰, 巫彬芳, 等. 金纳米颗粒和多壁碳纳米管协同增敏的维生素C传感器的研制与应用[J]. 华南农业大学学报, 2022, 43(5): 115-123. doi: 10.7671/j.issn.1001-411X.202112005
    引用本文: 栗云鹏, 施玉峰, 巫彬芳, 等. 金纳米颗粒和多壁碳纳米管协同增敏的维生素C传感器的研制与应用[J]. 华南农业大学学报, 2022, 43(5): 115-123. doi: 10.7671/j.issn.1001-411X.202112005
    shu
    LI Yunpeng, SHI Yufeng, WU Binfang, et al. Development and application of vitamin C sensor with synergistic sensitization of gold nanoparticles and multi walled carbon nanotubes[J]. Journal of South China Agricultural University, 2022, 43(5): 115-123. doi: 10.7671/j.issn.1001-411X.202112005
    Citation: LI Yunpeng, SHI Yufeng, WU Binfang, et al. Development and application of vitamin C sensor with synergistic sensitization of gold nanoparticles and multi walled carbon nanotubes[J]. Journal of South China Agricultural University, 2022, 43(5): 115-123. doi: 10.7671/j.issn.1001-411X.202112005
    shu

    金纳米颗粒和多壁碳纳米管协同增敏的维生素C传感器的研制与应用

    Development and application of vitamin C sensor with synergistic sensitization of gold nanoparticles and multi walled carbon nanotubes

      摘要
    • 摘要:
      目的  开发一种低成本、高响应的维生素C电化学传感器，用于实现果蔬中维生素C含量的快速检测。
      方法  通过在铅笔芯电极上修饰金纳米颗粒和多壁碳纳米管，构建具有维生素C强催化响应的MWCNTs/Au/PGE电极。通过扫描电镜、X射线光电子能谱、拉曼光谱和循环伏安法表征电极，采用差分脉冲伏安法确定电极的pH适用范围和最优pH条件。采用时间电流法建立标准曲线和方程，以实现快速检测。最后通过加标回收率法检测番茄中维生素C含量。
      结果  基于MWCNTs/Au/PGE电极的维生素C电化学传感器可在pH 4~8范围内准确地测定维生素C含量，在pH 5时性能最优。快速检测时检测维生素C的质量分数范围为1~500 μg/g，灵敏度达0.244 μA·(μg/g)−1·cm−2。该传感器对葡萄糖、苹果酸和柠檬酸的干扰率均小于1.77%，同一传感器多次测定的相对标准偏差为2.7%。成功检出番茄样品中的维生素C质量分数为69.42 μg/g，加标回收率为109%~113%，相对标准偏差小于2.26%。
      结论  MWCNTs/Au/PGE电极制备工艺简单，成本低，灵敏度高，测量范围宽，有较强的稳定性和抗干扰性，为实现快速检测果蔬中维生素C提供了新思路。

       

      Abstract:
      Objective  A low-cost and high response electrochemical sensor for vitamin C was developed to realize the rapid detection of vitamin C content in fruits and vegetables.
      Method  MWCNTs/Au/PGE electrode with strong catalytic response to vitamin C was constructed by modifying gold nanoparticles and multi walled carbon nanotubes on pencil lead electrode. The electrode was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and cyclic voltammetry. The application range and optimal condition of the electrode pH were determined by differential pulse voltammetry. The standard curve and equation were established by time-current method to realize rapid detection. Finally, the vitamin C content of tomato was detected by standard addition recovery method.
      Result  The vitamin C electrochemical sensor based on MWCNTs/Au/PGE electrode could accurately determine the vitamin C content in the range of pH 4–8, and its performance was the best when pH was 5. During rapid detection, the detection mass fraction range was 1–500 μg/g, sensitivity up to 0.244 μA·(μg/g)−1·cm−2. The interference rates of the sensor to glucose, malic acid and citric acid were less than 1.77%, and the relative standard deviation (RSD) measured by the same sensor for many times was 2.7%. The vitamin C content of tomato sample was 69.42 μg/g, the recovery was 109%–113%, and the RSD was less than 2.26%.
      Conclusion  MWCNTs/Au/PGE electrode has the advantages of simple preparation process, low cost, high sensitivity, wide measurement range, strong stability and anti-interference. It provides a new idea for the rapid detection of vitamin C in fruits and vegetables.

       

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