Synthesis of A New Type of Responsive Hydrophilic Block Copolymer Fluorescence Probe and Its Application in Detection of Aluminum Ion in Agricultural Products / 分析化学

ABSTRACT

A temperature-responsive hydrophilic block copolymer fluorescence sensor based on selective analysis of Al3+was designed and synthesized. The polymer fluorescent probe (L64-BTPA-SHMA) was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization and characterized by 1 H NMR,and the recognition performance of the polymer probe was studied by fluorescence spectroscopy. It was found that the fluorescence response of Al3+detected by this polymer fluorescence probe was significantly affected by temperature. The higher the temperature, the lower the fluorescence intensity was observed. The results showed that 0.1 g/L polymer fluorescent probe had a good selectivity to Al3+in buffer solution at 25℃and pH 7.4,and was not affected by other metal ions. A fluorescence detection method based on this polymer probe for Al3+was developed. In this method,the fluorescence intensity was linear with Al3+concentration in the range of 2. 0 -18. 0 μmol/L, with a correlation coefficient of 0. 9977 and a detection limit of 1.43 μmol/L. The fluorescence response between the polymer fluorescence chemosensor and Al3+could be altered by controlling the temperature change. The successful application of the polymer fluorescence probe for detecting Al3+residues in agricultural products has practical application value.