Dummy molecularly imprinted polymers as the coating of stir bar for sorptive extraction of bisphenol A in tap water |
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Authors: | Sheng Na Wei Fangdi Zhan Wen Cai Zheng Du Shuhu Zhou Xuemin Li Fei Hu Qin |
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Institution: | School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, PR China. |
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Abstract: | A unique stir bar coated with dummy molecularly imprinted polymers for bisphenol A was prepared by sol-gel technique. The scanning electron microscopic image of the coating presented a homogeneous surface with a thickness of about 57 ± 2.5 μm. The Fourier transform infrared spectrum of the coating proved the incorporating of dummy molecularly imprinted polymers with the sol-gel network. When used to extract bisphenol A from aqueous solution containing bisphenol A and its three analogs (4-tert-butylphenol, 4,4'-dihydroxybiphenyl, and 3,3',5,5'-tetrabromo-bisphenol A). Dummy molecularly imprinted polymers-coated stir bar showed better selectivity than the bars coated with polydimethylsiloxane or non-imprinted polymers. The extraction conditions including stirring speed, pH, and extraction time were optimized. After back extraction with methanol, the extracts were analyzed by high-performance liquid chromatography-fluorescence detection. The linear range was 0.0228-0.456 ng/mL with correlation coefficient of 0.9994 and the detection limit was about 5.70 × 10(-3) ng/mL based on three times ratio of signal-to-noise. The method was applied to the determination of trace bisphenol A in tap water. |
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Keywords: | Bisphenol A / Dummy molecularly imprinted polymers / Sol‐gel / Stir bar sorptive extraction |
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