A selective fluorescent resonance energy transfer quenching and resonance light scattering enhancement dual-recognition probe for 2,4,6-trinitrotoluene

作者：Zou Wen Sheng^*; Zou Fei Hua; Shao Qun; Zhang Jun; Wang Ya Qin; Xie Fa Zhi; Ding Yi

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2014, 278: 82-88.

DOI：10.1016/j.jphotochem.2014.01.002

• Fluorescence resonance energy transfer (FRET)
• Resonance light scattering (RLS)
• Dual-recognition probe
• 2,4,6-Trinitrotoluene (TNT)
• Chemosensor

Fluorescein isothiocyanate (FITC) conjugated to polyethylenimine (PEI) (FITC&PEI) was synthesized and characterized. The nitrogen-containing organic groups played a key role in sensing nitroaromatic compounds that can bind 2,4,6-trinitrotoluene (TNT) to form TNT anions through an acid-base pairing interaction and FITC dye conjugation. The formation of TNT anions efficiently quenched the emission of FITC dye at 516 nm by fluorescent resonance energy transfer and induced the enhancement of a resonance light scattering (RLS) signal. A novel, dual-channel chemosensory FITC&PEI probe was thus constructed. Meanwhile, the FITC&PEI probe also exhibited highly selective fluorescence and RLS responses for TNT over other nitroaromatic compounds. Very good linearity was observed within the ranges of 3.0-150 nM TNT (detection limit down to 0.5 nM and RSD of 5.8%, n = 7) for fluorescence and 1.0-150 nM TNT (detection limit down to 0.2 nM and RSD of 8.4%, n = 7) for RLS. The proposed methods were well-suited for detecting and distinguishing trace amounts of TNT in aqueous solution.

• 出版日期2014-3-15