应用化学 ›› 2022, Vol. 39 ›› Issue (8): 1285-1293.DOI: 10.19894/j.issn.1000-0518.210353

• 研究论文 • 上一篇    下一篇

钌-石墨烯量子点人工酶合成及用于胡萝卜中辛硫磷的光度检测

王文栋, 李在均()   

  1. 江南大学化学与材料工程学院,无锡 214125
  • 收稿日期:2021-07-21 接受日期:2021-12-07 出版日期:2022-08-01 发布日期:2022-08-04
  • 通讯作者: 李在均
  • 基金资助:
    国家重点研发计划项目(2018YFC1603001)

Synthesis of Ruthenium‑Graphene Quantum Dots Artificial Oxidase and Its Application in Colorimetric Detection of Phoxim in Carrots

Wen-Dong WANG, Zai-Jun LI()   

  1. School of Chemistry and Materials Engineering,Jiangnan University,Wuxi 214125,China
  • Received:2021-07-21 Accepted:2021-12-07 Published:2022-08-01 Online:2022-08-04
  • Contact: Zai-Jun LI
  • About author:zaijunli@jiangnan.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2018YFC1603001)

摘要:

组氨酸功能化石墨烯量子点(His-GQDs)与三氯化钌反应生成稳定的钌配合物。此配合物在氮气氛围中于600 ℃恒温处理1 h得到钌-石墨烯量子点复合物(Ru-His-GQD)。扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析的结果表明,Ru-His-GQD具有三维结构。钌纳米粒子粒径位于40~60 nm之间。Ru-His-GQD含有丰富的功能基团,具有高的类氧化酶活性。基于Ru-His-GQD催化3,3′,5,5′-四甲基联苯胺(TMB)氧化生成蓝色化合物,建立了一种测定胡萝卜中辛硫磷的光度分析方法。辛硫磷可抑制Ru-His-GQD氧化酶的活性,导致蓝色化合物吸光度下降。当辛硫磷浓度在30~240 μg/L之间,TMB氧化产物在652 nm处的吸光度随辛硫磷浓度增加而线性下降。方法的检出限达到7.33 μg/L(S/N=3),灵敏度高于现有文献报道结果,成功用于胡萝卜中辛硫磷的检测。

关键词: 农药检测, 功能化石墨烯量子点, 钌纳米粒子, 辛硫磷, 比色传感器

Abstract:

The histidine functionalized graphene quantum dots (His-GQDs) react with ruthenium trichloride to form a stable ruthenium complex. This complex is treated in a N2 atmosphere at 600 ℃ for 1 h to obtain a ruthenium-graphene quantum dot composite (Ru-His-GQD). The results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis demonstrate that Ru-His-GOD has one three-dimensional structure. The diameter of ruthenium nanoparticles is between 40 and 60 nm. Ru-His-GQD is rich in functional groups and has high oxidase-like activity. Based on Ru-His-GQD catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue compounds, a photometric method for the determination of phoxim in carrots is established. Phoxim can inhibit the activity of Ru-His-GQD oxidase, resulting in a decrease in the absorbance of the blue compound. When the concentration of phoxim is between 30~240 μg/L, the absorbance of the oxidation product of TMB at 652 nm decreases linearly with the increase of phoxim concentration. The detection limit of the method reaches 7.33 μg/L (S/N=3), and the sensitivity is higher than those in literature. It has been successfully applied to the detection of phoxim in carrots.

Key words: Pesticide detection, Functionalized graphene quantum dots, Ruthenium nanoparticles, Phoxim, Colorimetric sensor

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