Liu Wei, Wei Fangdi, Xu Guanhong, Wu Yanzi, Hu Chunting, Song Quan, Yang Jing, Hu Qin
J Nanosci Nanotechnol. 2016 Jun;16(6):6511-9. doi: 10.1166/jnn.2016.10851.
In the present paper, a simple and rapid "turn-on" fluorescence sensor for Zn2+ based on ethylene diamine tetraacetic acid (EDTA) etched CdTe quantum dots (QDs) was developed. First, the initial bright fluorescence of mercaptopropionic acid (MPA) capped CdTe QDs was effectively quenched by EDTA, and then the presence of Zn2+ could "turn on" the weak fluorescence of QDs quenched by EDTA due to the formation of ZnS passivation shell. The increase of fluorescence intensity of EDTA etched QDs was found to be linear with the concentration of Zn2+ added. Under the optimum conditions, the calibration curve of this method showed good linearity in the concentration range of 9.1-1 09.1 μM of Zn2+ with the correlation coefficient R2 = 0.998. The limit of detection (3σ/K) was 2 μM. The developed QDs-based sensor was successfully applied to detect trace zinc in zinc fortified table salts and energy drinks with satisfactory results.
在本文中，基于乙二胺四乙酸（EDTA）蚀刻的碲化镉量子点（QDs）开发了一种简单快速的用于检测Zn²⁺的“开启型”荧光传感器。首先，巯基丙酸（MPA）包覆的CdTe量子点最初的明亮荧光被EDTA有效猝灭，然后由于形成了ZnS钝化壳，Zn²⁺的存在可以“开启”被EDTA猝灭的量子点的微弱荧光。发现EDTA蚀刻的量子点的荧光强度增加与添加的Zn²⁺浓度呈线性关系。在最佳条件下，该方法的校准曲线在9.1 - 109.1 μM的Zn²⁺浓度范围内显示出良好的线性，相关系数R² = 0.998。检测限（3σ/K）为2 μM。所开发的基于量子点的传感器成功应用于检测加锌食盐和能量饮料中的痕量锌，结果令人满意。
