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Reference type: Journal
Authors: Dong JW, Gao N, Peng Y, Guo C, Lv ZQ, Wang Y, Zhou CH, Ning BA, Liu M, Gao ZX
Article Title: Surface plasmon resonance sensor for profenofos detection using molecularly imprinted thin film as recognition element.
Publication date: 2012
Journal: Food Control
Volume: 25
Issue: (2)
Page numbers: 543-549.
DOI: 10.1016/j.foodcont.2011.11.015
Alternative URL: http://www.sciencedirect.com/science/article/pii/S095671351100497X

Abstract: A surface plasmon resonance (SPR) sensor that uses molecularly imprinted polymer (MIP) ultrathin film as sensing material was developed for detecting profenofos in tap water. The MIP ultrathin film was anchored on a gold chip by surface-initiated radical polymerization. The gold surface was first modified by 11-mercaptoundecanoic acid to form a self-assembled monolayer (SAM). To easily graft 2,2-azobis (2-amidinopropane) hydrochloride onto the SAM, the carboxyl of SAM was activated using 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide. Then, the MIP film was synthesized by thermal-initiated polymerization using methacrylic acid as functional monomer and trimethylolpropane trimethacrylate as cross-linker. On the basis of this principle, two methods for ultrathin film preparation were studied and the most suitable technique was adopted. The prepared ultrathin film was characterized by atomic force microscopy. The MIP-SPR sensor was used to detect profenofos in tap water spiked with 0.001 - 0.1 μg mL-1 of the insecticide. The sensor showed high sensitivity, selectivity and good stability. The recoveries and repeatability (RSD, n = 4) of the sensor were 89.81 - 100.99% and 3.69 - 5.76%, respectively, while the detection limit based on a signal-to-noise ratio of 3 (S/N = 3) was 3.6 x 10-4 μg mL-1
Template and target information: profenofos
Author keywords: molecular imprinting, Surface-initiated polymerization, Thermal-initiated polymerization, surface plasmon resonance, Profenofos


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