共 50 条
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.
引用
收藏
页数:9
相关论文
共 50 条