超分子荧光探针用于环境水样中百草枯的测定

A Fluorescent Probe Based Host-Guest Complexation Between Cucurbit[7]uril and Neutral Red for the Detection of Paraquat Herbicide in Water Sample

基于七元瓜环可使中性红的荧光增强从而设计荧光探针,当在荧光探针中加入百草枯后荧光强度又逐渐降低,利用此种超分子配合物的荧光"开-关"效应,从而建立了一种新颖的检测百草枯的荧光方法。当百草枯浓度在(1~8)×10^(-6 )mol·L^(-1)范围内,百草枯浓度与探针的荧光强度具有良好的线性关系,且检出限为1.4×10^(-8 )mol·L^(-1),加标回收率为104%~108%,可在河水样品中检测百草枯的含量。

We have now shown that a host-guest complex between cucurbit[7]uril(Q[7])and neutral red(NR)can be used as a fluorescent probe for detecting theherbicide paraquat.The Q[7]/NR complex can be used to detect paraquat with high selectivity using fluorescence spectrometry.A linear correlation(ΔF=4.98+0.32 c,r=0.999 1)was observed between the fluorescence intensity and the concentration of PQ over the concentration range(1~8)×10-6 mol·L-1.The detection limit for PQ was 1.40×10-8 mol·L-1.Recoveries obtained with the proposed method in river water examples were 104%~108%.Such method provides a rapid,selective and sensitive strategy for herbicide detection in real samples.