A simple and sensitive fluorescence biosensor for detection of organophosphorus pesticides using H2O2-sensitive quantum dots/bi-enzyme

作者：Meng, Xianwei; Wei, Jianfei; Ren, Xiangling; Ren, Jun^*; Tang, Fangqiong

来源：Biosensors and Bioelectronics, 2013, 47: 402-407.

DOI：10.1016/j.bios.2013.03.053

• Quantum dots
• Dichlorvos
• Enzyme biosensor
• Inhibition
• Real sample
• Simple

In this paper, we have developed a simple, fast, convenient and sensitive method for determination of organophosphorus pesticides in real samples based on inhibition mechanism of acetylcholinesterase (AChE). The biosensor is composed of enzymes (AChE and ChOx (choline oxidase)), QDs and acetylcholine (ACh), without any complex process of assembly for biosensor. After the experimental conditions are optimized, the limit of detection (LOD) for dichlorvos (DDVP) is found to be 4.49 nM. Two linear ranges allow a wide determination of DDVP concentration from 4.49 nM to 6780 nM. Furthermore, a possible mechanism is put forward to explain the fluorescence quenching of CdTe QDs in the presence of H2O2. More importantly, the obtained biosensor is proven to be suitable for the detection of residues of organophosphorus pesticides (OPs) in real examples. The excellent performance of this biosensor will facilitate future development of rapid and high-throughput detection of organophosphorus pesticides.

• 出版日期2013-9-15
• 单位中国科学院理化技术研究所; 中国科学院大学