基于β-环糊精功能化金纳米粒子检测铅离子的研究

Detection of lead ions based onβ-cyclodextrin functionalized gold nanoparticles

采用β-环糊精作为还原剂和稳定剂对金纳米粒子进行功能化,当溶液中有铅离子存在时,会导致功能化金纳米粒子的聚集,体系颜色发生变化,从而实现对铅离子残留的比色检测。研究结果表明,伴随Pb2+浓度的提高,体系颜色由淡红色转变为蓝色或紫色;紫外-可见光光谱分析结果表明,当铅离子浓度处于0.01~2000μmol/L时,R2值为0.9832,工作曲线方程为y=-31.4573x+6.3984,最低检测限为8.98μmol/L;该检测体系稳定且有优异的重复性,并对4种常见氨基酸和3种常见金属离子具有明显的抗干扰性能。

β-Cyclodextrin is used as reductant and stabilizer to functionalize gold nanoparticles.If lead ions exist in a solution,which can lead to the aggregation ofβ-CD-AuNPs and therefore the color of the system changes,and the targeted detection of lead ions can be realized.It is demonstrated that a red-to-blue color change can be observed in the solution with the increasing Pb2+concentration.The results by UV-Vis spectrum indicate that R2 value is 0.9832 and the working curve equation is y=-31.4573x+6.3984 when Pb2+concentration is in the range of 0.01-2000μmol·L^-1.The detection limit is 8.98μmol·L^-1.Additionally,the proposed colorimetric method exhibits excellent repeatability and shows significant anti-interference performance against 4 kinds of common amino acids and 3 kinds of common metal ions.