Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 114, Issue 2, Pages 565-572Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2005.06.020
Keywords
fluorescence sensor; bisphenol A (BPA); cyclodextrin polymer
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Based on the reversible recognizing reaction between insoluble beta-cyclodextrin polymer (beta-CDP) and bisphenol A (BPA), a bifurcated optical fiber chemical sensor has been proposed for continuous monitoring of BPA. When immobilized in a plasticized poly(vinyl chloride) membrane of 5 mu m thickness, beta-CDP extracts BPA from aqueous solutions into the bulk membrane phase and reacts with the analyte to form an inclusion complex with high fluorescence efficiency. Formation of the complex gives a significant enhancement of the intrinsic fluorescence (lambda(ex)/lambda(em) = 286 nm/312 nm) of BPA which is suitable for signaling the occurrence of the host-guest recognizing interaction. The fluorescence sensor exhibits a dynamic detection range from 6.0 x 10(-6) mol/L to 1.0 x 10(-3) mol/L with a detection limit of 1.0 x 10-6 mol/L. The high selectivity of the sensor toward BPA depends on the synergistic shielding effect by beta-CD units and an optimal space-matching between the host and the guest. The proposed sensor was successfully used for the determination of BPA in water samples. (c) 2005 Elsevier B.V. All fights reserved.
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