紫外-可见吸收光谱和荧光光谱研究壳核型 CdTe/CdS量子点与盐酸巴马汀的相互作用及其分析应用

合成了巯基乙酸(TGA)修饰的壳核型CdTe/CdS量子点(TGA-CdTe/CdS QDs), 利用紫外-可见光谱和荧光光谱研究了TGA-CdTe/CdS QDs与盐酸巴马汀(PC)的相互作用机理. 结果表明, 在pH=7.4的Tris-HCl缓冲液中, QDs与PC相互作用后使QDs的荧光呈线性猝灭, 并有良好的线性关系(r=0.997), 线性范围为25~1×10⁴ ng/mL, 检出限(3σ)为7.7 ng/mL. 建立了一种快速简便、 可定量测定PC的新方法.

Fluorescence Spectrometry and UV-Vis Absorption Spectra Analysis of Interaction of Core-shell CdTe/CdS QDs with Palmatine Chloride and Its Applications

Core-shell CdTe/CdS quantum dots(QDs) were synthesized using mercaptoacetic acid as stabilizer.A novel method for the determination of palmatine chloride(PC) was developed based on the quenching of the fluorescence of CdTe/CdS QDs at an excitation wavelength of 340 nm.Fluorescence spectrometry and ultraviolet-visible(UV-Vis) absorption spectra were utilized to study the interaction between CdTe/CdS QDs and PC.With the optimum reaction conditions of pH=7.4 Tris-HCl buffer solution,the quenched fluorescence intensity of CdTe/CdS QDs was linearly proportional to the concentration of PC with a correlation coefficient of r=0.997,and the detection limits were in the range of 25—1×104 ng/mL and the detection limit(3σ) for PC was 7.7 ng/mL.This new method can quickly,simply,conveniently and quantitatively detemine PC.