A ratiometric fluorescent sensor based on molecularly imprinted multilevel mesoporous silica for highly sensitive detection of imidacloprid

被引:15
作者
Wei, Ziqi [1 ]
Zhang, Weiyi [2 ]
Wang, Shengjie [1 ]
Han, Yiyi [2 ]
Feng, Dongsheng [2 ]
Ma, Yingqing [2 ]
Deng, Bo [2 ]
Chen, Zixin [1 ]
Mao, Jialuo [1 ]
Xu, Fei [1 ]
Wang, Zhen [2 ]
Cao, Hui [1 ]
机构
[1] Univ Shanghai Sci & Technol, Shanghai Engn Res Ctr Food Rapid Detect, Sch Hlth Sci & Engn, POB 454,516,Jungong Rd, Shanghai 200093, Peoples R China
[2] Shanghai Ctr Agriprod Qual & Safety, Shanghai 201708, Peoples R China
关键词
Imidacloprid; Detection; Ratiometric fluorescence; Post-imprinting modification; Molecularly imprinted multilevel mesoporous  silica; PERFORMANCE LIQUID-CHROMATOGRAPHY; CDTE QUANTUM DOTS; CARBON DOTS; GOLD NANOPARTICLES; MICROSPHERES; HONEYBEES; FACILE; HYBRID; PROBE; ACID;
D O I
10.1016/j.dyepig.2022.110775
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Herein, A ratiometric fluorescent sensor based on molecularly imprinted multilevel mesoporous silica (MIFP-SiCQDs@CdTe QDs) was designed for highly sensitive detection of imidacloprid (IDP) pesticide with long half-life in soil, plants, and water environments. In this sensor, CdTe QDs were anchored onto the multilevel mesoporous of MIFP-SiCQDs by post-imprinting modification as the analytical signal to improve the detection sensitivity of the conventional doping method (d-MIFP). The results showed that the synthesized MIFP-SiCQDs@CdTe QDs possessed both small mesopore (2-3 nm) and large mesopore (5-50 nm), which is favorable for the anchoring of CdTe QDs (about 2-3 nm in diameter) and the mass transfer of IDP into them. Due to the multilevel mesoporous structure and low background, the sensor responded well to the addition of IDP in the range of 5 ng mL-1-0.5 mu g mL-1 with a detection limit of 3.55 ng mL-1. The MIFP-SiCQDs@CdTe QDs sensor was successfully applied to determine IDP levels in real samples with the average recovery ranging from 97.64 to 109.88% and RSD values ranging from 1.00 to 4.65%. Furthermore, the quenching mechanism of MIFP-SiCQDs@CdTe QDs by IDP was considered to be the dynamic quenching. These results proved that the construction of multilevel mesoporous and post-imprinting modification of the analytical signal is an effective method to improve the sensitivity of d-MIP.
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页数:9
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