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A microvolume molecularly imprinted polymer modified fiber-optic evanescent wave sensor for bisphenol A determination
Authors:Yan Xiong  Zhongbin Ye  Jing Xu  Yucheng Liu  Hanyin Zhang
Institution:1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China
2. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
3. Liaoning Entry-Exit Inspection and Quarantine Bureau, Dalian, 116001, China
Abstract:A fiber-optic evanescent wave sensor for bisphenol A (BPA) determination based on a molecularly imprinted polymer (MIP)-modified fiber column was developed. MIP film immobilized with BPA was synthesized on the fiber column, and the sensor was then constructed by inserting the optical fiber prepared into a transparent capillary. A microchannel (about 2.0 μL) formed between the fiber and the capillary acted as a flow cell. BPA can be selectively adsorbed online by the MIP film and excited to produce fluorescence by the evanescent wave produced on the fiber core surface. The conditions for BPA enrichment, elution, and fluorescence detection are discussed in detail. The analytical measurements were made at 276 nm/306 nm (λ ex/λ em), and linearity of 3?×?10?9–5?×?10?6 g mL?1 BPA, a limit of detection of 1.7?×?10?9 g mL?1 BPA (3σ), and a relative standard deviation of 2.4 % (n?=?5) were obtained. The sensor selectivity and MIP binding measurement were also evaluated. The results indicated that the selectivity and sensitivity of the proposed fiber-optic sensor could be greatly improved by using MIP as a recognition and enrichment element. Further, by modification of the sensing and detection elements on the optical fiber, the proposed sensor showed the advantages of easy fabrication and low cost. The novel sensor configuration provided a platform for monitoring other species by simply changing the light source and sensing elements. The sensor presented has been successfully applied to determine BPA released from plastic products treated at different temperatures.
Figure
EW eixcation of BPA immobilized in MIP on the fiber core surface
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