title: Quantum dots coated with molecularly imprinted polymer as fluorescence probe for detection of cyphenothrin.
abstract: A newly designed molecularly imprinted polymer (MIP) material was fabricated and successfully utilized as recognition element to develop a quantum dots (QDs) based MIP-coated composite for selective recognition of the template cyphenothrin. The MIP-coated QDs were characterized by fluorescence spectrophotometer, Fourier transform infrared spectroscopy, transmission electron microscope, dynamic light scattering and X-ray powder diffraction. The fluorescence of the coated QDs is quenched on loading the MIP with cyphenothrin, and the effect is much stronger for the MIP than for the non-imprinted polymer, which indicates the MIP could as a recognition template composite. This method can detect down to 9.0 nmol L(-1) of cyphenothrin in water, and a linear relationship has been obtained covering the concentration range of 0.1-80.0 μmol L(-1). The method has been used in the determination of cyphenothrin in water samples and gave recoveries in the range from 88.5% to 97.1% with relative standard deviations in the range of 3.1-6.2%. The present study provides a new and general strategy to fabricate inorganic-organic MIP-coated QDs with highly selective recognition ability in aqueous media and is desirable for chemical probe application.
authors.affiliation: Department of Chemistry, College of Science, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Ren
authors.affiliation: Department of Chemistry, College of Science, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China. Electronic address: ligangchen2010@aliyun.com.
authors.forename: Ligang
authors.initials: L
authors.lastname: Chen
mesh_terms: D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005456:Fluorescent Dyes / Q000138:chemical synthesis*; D008422:Materials Testing; D054802:Molecular Imprinting / Q000379:methods*; D010575:Pesticides; D011108:Polymers / Q000737:chemistry; D011722:Pyrethrins / Q000032:analysis*; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence / Q000295:instrumentation*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
chemical_list: D020099:Coated Materials, Biocompatible; D005456:Fluorescent Dyes; D010575:Pesticides; D011108:Polymers; D011722:Pyrethrins; D014874:Water Pollutants, Chemical; C051001:cyphenothrin
keywords: Cyphenothrin; Fluorescence quenching; Molecular imprinting; Quantum dots