title: Optical detection of λ-cyhalothrin by core-shell fluorescent molecularly imprinted polymers in Chinese spirits.
abstract: In this study, fluorescent molecularly imprinted polymers (FMIPs), which were for the selective recognition and fluorescence detection of λ-cyhalothrin (LC), were synthesized via fluorescein 5(6)-isothiocyanate (FITC) and 3-aminopropyltriethoxysilane (APTS)/SiO2 particles. The SiO2@FITC-APTS@MIPs were characterized by Fourier transform infrared (FT-IR), UV-vis spectrophotometer (UV-vis), fluorescence spectrophotometer, thermogravimetric analysis (TGA), confocal laser scanning microscope (CLSM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The as-synthesized SiO2@FITC-APTS@MIPs with an imprinted polymer film (thickness was about 100 nm) was demonstrated to be spherically shaped and had good monodispersity, high fluorescence intensity, and good selective recognition. Using fluorescence quenching as the detection tool, the largest fluorescence quenching efficiency (F0/F - 1) of SiO2@FITC-APTS@MIPs is close to 2.5 when the concentration of the LC is 1.0 μM L(-1). In addition, a linear relationship (F0/F - 1= 0.0162C + 0.0272) could be obtained covering a wide concentration range of 0-60 nM L(-1) with a correlation coefficient of 0.9968 described by the Stern-Volmer equation. Moreover, the limit of detection (LOD) of the SiO2@FITC-APTS@MIPs was 9.17 nM L(-1). The experiment results of practical detection revealed that the SiO2@FITC-APTS@MIPs as an attractive recognition element was satisfactory for the determination of LC in Chinese spirits. Therefore, this study demonstrated the potential of SiO2@FITC-APTS@MIPs for the recognition and detection of LC in food.
authors: School of Chemistry and Chemical Engineering and ‡School of Material Science and Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China.
authors: Jixiang
authors: J
authors: Wang
authors: Lin
authors: L
authors: Gao
authors: Donglai
authors: D
authors: Han
authors: Jianming
authors: J
authors: Pan
authors: Hao
authors: H
authors: Qiu
authors: Hongji
authors: H
authors: Li
authors: Xiao
authors: X
authors: Wei
authors: Jiangdong
authors: J
authors: Dai
authors: Jinghai
authors: J
authors: Yang
authors: Hui
authors: H
authors: Yao
authors: Yongsheng
authors: Y
authors: Yan
mesh_terms: D000327:Adsorption; D001628:Beverages / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002681:China; D005453:Fluorescence; D005506:Food Contamination / Q000032:analysis*; D057230:Limit of Detection; D054802:Molecular Imprinting; D009570:Nitriles / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011722:Pyrethrins / Q000032:analysis*
chemical_list: D009570:Nitriles; D010575:Pesticides; D011108:Polymers; D011722:Pyrethrins; C037304:cyhalothrin
keywords: fluorescence detection; molecular imprinted polymer; precipitation polymerization; selective recognition; λ-cyhalothrin