School of Chemical and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, PR China.
Key Laboratory of Synthetic Rubber, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, PR China.
Food Chem. 2017 Apr 15;221:803-808. doi: 10.1016/j.foodchem.2016.11.100. Epub 2016 Nov 22.
CdTe quantum dots was synthesized and used to quantitative analysis of Ponceau 4R in solution. With the excitation wavelength of 380nm the emission of CdTe quantum dots was quenched obviously by Ponceau 4R. In order to detect Ponceau 4R in mild condition the influences of fluorescence emission wavelength of CdTe quantum dots, pH value, temperature and reaction time were examined to establish the experimental condition. The linear response of the fluorescence intensity of CdTe quantum dots to Ponceau 4R allowed the quantitative analysis of Ponceau 4R in a range of 2.5-25μg/mL, and the limit of detection for Ponceau 4R was 0.025μg/mL. In addition, the responsive mechanism of this reaction system was investigated in detail by using the modified Stern-Volmer equation and thermodynamic calculation. Particularly, this method was used to quantitatively analyze the real sample, which indicated that this method could be more widely applied in similar samples.
CdTe 量子点被合成并用于溶液中 Ponceau 4R 的定量分析。在 380nm 的激发波长下，Ponceau 4R 明显猝灭了 CdTe 量子点的发射。为了在温和条件下检测 Ponceau 4R，考察了 CdTe 量子点的荧光发射波长、pH 值、温度和反应时间对建立实验条件的影响。CdTe 量子点荧光强度对 Ponceau 4R 的线性响应允许在 2.5-25μg/mL 的范围内对 Ponceau 4R 进行定量分析，Ponceau 4R 的检测限为 0.025μg/mL。此外，通过使用改进的 Stern-Volmer 方程和热力学计算详细研究了该反应体系的响应机制。特别是，该方法用于定量分析实际样品，表明该方法可以更广泛地应用于类似样品。
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