Luminescent Core鈥揝hell Imprinted Nanoparticles Engineered for Targeted F枚rster Resonance Energy Transfer-Based Sensing

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• 作者：Ana B. Descalzo ; Clara Somoza ; Mar铆a C. Moreno-Bondi ; Guillermo Orellana
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：June 4, 2013
• 年：2013
• 卷：85
• 期：11
• 页码：5316-5320
• 全文大小：301K
• 年卷期：v.85,no.11(June 4, 2013)
• ISSN：1520-6882

文摘

Red-luminescent 200 nm silica nanoparticles have been designed and prepared as a versatile platform for developing FRET (F枚rster resonance energy transfer) biomimetic assays. Ru(phen)₃²⁺ dye molecules embedded off-center in the silica core provide the long-lived donor emission, and a near-infrared labeled analyte serves as fluorescent acceptor (the measured R₀ of this D鈥揂 pair is 4.3 nm). A thin surface-grafted molecularly imprinted polymer (MIP) shell intervenes as selective enrofloxacin-binding element. These nanoparticles have been tested for photochemical detection of enrofloxacin by using a competitive scheme that can be readily performed in MeCN鈥揌EPES (pH 7.5) 7:3 (v/v) mixtures and allows for the antibiotic detection in the 渭M range (LOD = 2 渭M) without optimization of the assay. Given the well-known difficulties of coupling the target-binding-to-MIP and the transducing events, the novel photochemical approach tuned up here will be valuable in future developments of MIP-based assays and optosensors that capitalize also on the advantages of nanomaterials for (bio)analysis.