A selective optical sensor for picric acid assay based on photopolymerization of 3-(N-methacryloyl) amino-9-ethylcarbazole |
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Authors: | Hu Yan-Jun Tan Shu-Zhen Shen Guo-Li Yu Ru-Qin |
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Affiliation: | aState Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China |
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Abstract: | A novel optical sensor based on covalent immobilization for picric acid assay has been described. To improve the stability of the sensor, a terminal double bond was attached to the fluorescent compound, 3-amino-9-ethylcarbazole (AEC), via methacryloyl chloride. The resultant compound, 3-(N-methacryloyl) amino-9-ethylcarbazole (MAEC) was copolymerized with 2-hydroxypropyl methacrylate on surface-modified quartz glass plates by UV irradiation. The resulting optical sensor (optode membrane) was used to determine picric acid based on fluorescence quenching. It shows a linear response toward picric acid in the concentration range of 9.33 × 10−8 to 9.33 × 10−5 mol l−1, with rapid response, high stability and good selectivity to picric acid. |
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Keywords: | Optical sensor 3-(N-methacryloyl) amino-9-ethylcarbazole Covalent immobilization Fluorescence quenching Picric acid |
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