title: Surface plasmon resonance sensor based on magnetic molecularly imprinted polymers amplification for pesticide recognition.
abstract: We reported here a method to enhance detection sensitivity in surface plasmon resonance (SPR) spectroscopy integrated with a surface molecular imprinting recognition system and employing magnetic molecular imprinting polymer nanoparticles for amplifying SPR response. The proposed magnetic molecular imprinting polymer was designed by self-polymerization of dopamine on the Fe3O4 NPs surface in weak base aqueous solution in the presence of template chlorpyrifos (CPF). The imprinted Fe3O4@polydopamine nanoparticles (Fe3O4@PDA NPs) were characterized by Fourier transform infrared spectroscopy, UV-vis absorption spectroscopy, and transmission electron microscopy. The biosensor showed a good linear relationship between the SPR angle shift and the chlorpyrifos concentration over a range from 0.001 to 10 μM with a detection limit of 0.76 nM. A significant increase in sensitivity was therefore afforded through the use of imprinted Fe3O4@PDA NPs as an amplifier, and meanwhile, the imprinted Fe3O4@PDA NPs had an excellent recognition capacity to chlorpyrifos over other pesticides. The excellent sensitivity and selectivity and high stability of the designed biosensor make this magnetic imprinted Fe3O4@PDA NP an attractive recognition element for various SPR sensors for detecting pesticide residuals and other environmentally deleterious chemicals.
authors.affiliation: Department of Chemistry, Nanchang University , Nanchang, Jiangxi 330031, P. R. China.
authors.forename: Gui-Hong
authors.initials: GH
authors.lastname: Yao
authors.forename: Ru-Ping
authors.initials: RP
authors.lastname: Liang
authors.forename: Chun-Fang
authors.initials: CF
authors.lastname: Huang
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Jian-Ding
authors.initials: JD
authors.lastname: Qiu