title: Selective recognition and discrimination of water-soluble azo dyes by a seven-channel molecularly imprinted polymer sensor array.
abstract: A seven-channel molecularly imprinted polymer sensor array was prepared and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, UV-Vis spectroscopy, and nitrogen physisorption studies. The results revealed that the imprinted polymers have distinct-binding affinities from those of structurally similar azo dyes. Analysis of the UV-Vis spectral response patterns of the seven dye analytes against the imprinted polymer array suggested that the different selectivity patterns of the array were closely connected to the imprinting process. To evaluate the effectiveness of the array format, the binding of a series of analytes was individually measured for each of the seven polymers, made with different templates (including one control polymer synthesized without the use of a template). The response patterns of the array to the selected azo dyes were processed by canonical discriminant analysis. The results showed that the molecularly imprinted array was able to discriminate each analyte with 100% accuracy. Moreover, the azo dyes in two real samples, spiked chrysoidin in smoked bean curd extract and Fanta lime soda (containing tartrazine), were successfully classified by the array.
authors.affiliation: Xinjiang Uygur Autonomous Region Product Quality Supervision and Inspection Institute, Urumqi, P. R. China.
authors.forename: Zerong
authors.initials: Z
authors.lastname: Long
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.forename: Mingliang
authors.initials: M
authors.lastname: Zhang
authors.forename: Hongdeng
authors.initials: H
authors.lastname: Qiu
mesh_terms: D001391:Azo Compounds / Q000032:analysis* / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D008855:Microscopy, Electron, Scanning; D054802:Molecular Imprinting; D015394:Molecular Structure; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D011108:Polymers; D014867:Water
keywords: Azo dyes; Canonical discriminant analysis; Molecularly imprinted polymers; Sensor arrays