期刊
FOODS
卷 11, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/foods11213331
关键词
aptamer; mesoporous silica nanoparticles; surface-enhanced Raman spectroscopy; chlorpyrifos; residue
资金
- National Natural Science Foundation of China [32202146]
Chlorpyrifos, an organophosphorus insecticide, can be quantitatively detected using a new method developed in this study. The method involves loading the signal molecule 4-ATP into nanoparticles and coating them with an aptamer for chlorpyrifos. The release of 4-ATP correlates with the concentration of chlorpyrifos, and a standard curve can be established for quantitative analysis. The method shows good performance in apple and tomato samples.
Chlorpyrifos is an organophosphorus insecticide, which can be used to control a variety of chewing and piercing mouthparts pests in agricultural production. It can destroy the normal nerve impulse conduction by inhibiting the activity of acetylcholinesterase or cholinesterase in the nerves, causing a series of poisoning symptoms. In order to achieve the quantitative analysis of chlorpyrifos residues in agricultural products, an aptamer-controlled signal molecule release method was developed in this study. The signal molecule 4-ATP of surface-enhanced Raman spectroscopy (SERS) was loaded into aminated mesoporous silica nanoparticles (MSNs-NH2) prepared by the one pot method, and then coated with an aptamer of chlorpyrifos through electrostatic interaction. The specific binding of the aptamer and chlorpyrifos led to the release of 4-ATP, and the amount of 4-ATP released was positively correlated with the amount of chlorpyrifos. Finally, the standard curve of chlorpyrifos quantitative detection based on SERS was established. Meanwhile, Ag-carrying mesoporous silica (Ag@MSNs) was prepared as the reinforcement substrate for SERS detection. The results showed that there was a good linear correlation between the Raman intensity and the concentration of chlorpyrifos at 25-250 ng/mL, and the limit of detection (LOD) was 19.87 ng/mL. The recoveries of chlorpyrifos in the apple and tomato samples were 90.08-102.2%, with RSD < 3.32%. This method has high sensitivity, specificity, reproducibility and stability, and can be used for the quantitative detection of chlorpyrifos in the environment and agricultural products.
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