Colorimetric and visual determination of total nereistoxin-related insecticides by exploiting a nereistoxin-driven aggregation of gold nanoparticles

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• 作者：Wei Liu ; Daohong Zhang ; Wenxin Zhu ; Sikai Zhang ; Yashan Wang…
• 关键词：Colorimetric detection ; Nereistoxin ; related insecticides ; Residue ; Gold nanoparticles
• 刊名：Microchimica Acta
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：182
• 期：1-2
• 页码：401-408
• 全文大小：2,537 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

We describe a method for the visual and colorimetric determination of total nereistoxin-related insecticide residues. It is based on the nereistoxin-induced aggregation of gold nanoparticles (AuNPs). The nereistoxin-related insecticides are first converted to nereistoxins in a pretreatment step that involves liquid–liquid extraction and hydrolysis for sample clean-up. Next, the interaction between nereistoxins and AuNPs provides a possibility to visually semi-quantify or accurately quantify nereistoxins because it is associated with a color change from red to blue. The interaction between nereistoxins and AuNPs is caused by the electrostatic interactions and the strong Au–S covalent bonds. The photometric assay is performed by measuring the ratio of absorbances at 660 and 519?nm, respectively. It has a detection range from 50 to 250?μg?kg? and a detection limit of 40?μg?kg? to for the total quantity of nereistoxin-related insecticides. The visually detectable color change to blue occurs in the 50 to 100?μg?kg? concentration range, and this enables a fast visual test on whether or not the concentration of total nereistoxin-related insecticides exceeds the tolerated level of 100?μg?kg?. The method was applied to the analysis of nereistoxin-related insecticides in agricultural products. Graphical Abstract A colorimetric and visual determination of nereistoxin-related insecticides was developed based on nereistoxin-induced aggregation of Au nanoparticles. A liquid–liquid extraction was used for sample clean-up. The developed method was successfully applied to the analysis of total nereistoxin-related insecticides residue in agricultural products.