Sensitive detection of levofloxacin and copper (II) based on fluorescence ‘‘turn on-off” of biomass carbonized polymer dots

다국어 초록 (Multilingual Abstract)

A novel type of biomass carbonized polymer dots (CS-CPDs) with green fluorescence emission were synthesizedvia a one-step microwave-assisted method, using chitosan and maleic acid as the precursors.
The fluorescence intensity of CS-CPDs was selectively enhanced (turn on) with increasing levofloxacin(LEV) concentration based on Aggregation Induced Emission Enhancement. The linear range of thismethod was 1–35 lmol/L, with the limit of detection of 0.20 lmol/L. Furthermore, we demonstrated thatthe fluorescence intensity of CS-CPDs/LEV was restored (turn on-off) due to the addition of copper (II),which could assemble a more stable Cu2+/LEV complex through coordination. For the first time, CSCPDswere utilized as a selective fluorescent ‘‘turn on-off” probe for the continuous detection of LEVand Cu2+. Excellent results were also obtained in environmental water samples analysis with recoveriesranging of 91.3–99.6% and 97.7–113.4%, respectively. Moreover, the prepared CS-CPDs exhibited excellentoptical stability and large Stokes shift (139 nm), which predicted broad application prospects inthe field of fluorescence sensing.

참고문헌 (Reference)

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