Li Li, Zhang Qiaolin, Ding Yaping, Lu Yaxiang, Cai Xiaoyong, Yu Lurong
Department of Chemistry, Shanghai University, Shanghai, 200444, People's Republic of China,
J Fluoresc. 2015 Jul;25(4):897-905. doi: 10.1007/s10895-015-1570-9. Epub 2015 Apr 25.
Based on the quenching of the fluorescence intensity of thioglycolic acid (TGA)-capped core-shell CdTe/ZnS nanoparticles (NPs) by vanillin, a novel, simple and rapid method for the determination of vanillin was proposed. In aqueous medium, the functionalized core-shell CdTe/ZnS NPs were successfully synthesized with TGA as the capping ligand. TGA-capped core-shell CdTe/ZnS NPs were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. Factors affecting the vanillin detection were investigated, and the optimum conditions were also determined. Under the optimum conditions, the relative fluorescence intensity of CdTe/ZnS NPs was linearly proportional to vanillin over a concentration range from 9.4 × 10(-7) to 5.2 × 10(-4) M with a correlation coefficient of 0.998 and a detection limit of 2.6 × 10(-7) M. The proposed method was also employed to detect trace vanillin in cookies with satisfactory results.
基于香草醛对巯基乙酸（TGA）包覆的核壳型CdTe/ZnS纳米粒子（NPs）荧光强度的猝灭作用，提出了一种测定香草醛的新颖、简便、快速的方法。在水介质中，以TGA为包覆配体成功合成了功能化的核壳型CdTe/ZnS NPs。采用X射线衍射（XRD）、透射电子显微镜（TEM）和傅里叶变换红外（FTIR）光谱对TGA包覆的核壳型CdTe/ZnS NPs进行了表征。研究了影响香草醛检测的因素，并确定了最佳条件。在最佳条件下，CdTe/ZnS NPs的相对荧光强度在9.4×10⁻⁷至5.2×10⁻⁴ M的浓度范围内与香草醛呈线性比例关系，相关系数为0.998，检测限为2.6×10⁻⁷ M。该方法还用于检测饼干中的痕量香草醛，结果令人满意。
