1. A novel signal amplified electrochemiluminescence biosensor based on MIL-53(Al)@CdS QDs and SiO2@AuNPs for trichlorfon detection
- Author
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Defen Feng, Heyou Han, Yeyu Wu, Fang Li, Xuecai Tan, Gao-Chao Fan, Yongkuai Lu, and Fucun Wei
- Subjects
Detection limit ,Chemistry ,Energy transfer ,010401 analytical chemistry ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Signal ,0104 chemical sciences ,Analytical Chemistry ,Linear relationship ,Electrode ,Electrochemistry ,Environmental Chemistry ,Electrochemiluminescence ,0210 nano-technology ,Biosensor ,Spectroscopy ,Nuclear chemistry - Abstract
An ultrasensitive electrochemiluminescence (ECL) biosensor was developed based on MIL-53(Al)@CdS QDs and SiO2@AuNPs for trichlorfon detection. Metal–organic frameworks (MOFs) were used as a loading platform that provided a large surface area to load targets and modified materials onto the electrode. At the same time, SiO2@AuNPs loaded plenty of AuNPs which effectively increased the ECL resonance energy transfer between the CdS QDs, so that the ECL signal was strongly quenched and resulted in an amplified response. In the range of 10−11–10−4 M, the ECL response showed a linear relationship with the concentration (logarithm) of trichlorfon, and the detection limit was 5.1 × 10−12 M (S/N = 3). When the biosensor was applied to detect trichlorfon in lettuce, broccoli, cucumber, and chives, the recoveries obtained from the spiked samples were 97%–105%, 102%–104%, 100%–104%, and 98%–104%, respectively. Thus, this novel ECL biosensor has potential applications for the analysis of trichlorfon in food samples.
- Published
- 2021