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Determination of ellagic acid by fluorescence quenching method with glutathione capped CdTe quantum dots as the probe

机译：谷胱甘肽加帽的CdTe量子点荧光猝灭法测定鞣花酸

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A sensitive and simple method for the determination of ellagic acid (EA) was developed based on the fluorescence quenching effect of EA for glutathione (GSH)-capped CdTe quantum dots (QDs). Under optimum conditions, a good linear relationship was obtained from 0.3118 to 55.0 ??g mLa?’1 with a correlation coefficient of 0.9983, and the detection limit (3??/K) was 0.0936 ??g mLa?’1. The fluorescence quenching mechanism has been proposed on the basis of electron transfer supported by ultraviolet-visible (UV-vis) absorption, fluorescence (FL) spectroscopy and the measurement of fluorescence lifetime. The method has been applied to the determination of EA in synthetic samples and fresh urine samples of healthy humans with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.
机译：基于EA对谷胱甘肽（GSH）封端的CdTe量子点（QD）的荧光猝灭作用，开发了一种灵敏且简单的测定鞣花酸（EA）的方法。在最佳条件下，从0.3118到55.0 ?? g mLa？-1，具有良好的线性关系，相关系数为0.9983，检出限（3？/ K）为0.0936？g mLa？-1。荧光猝灭机理的提出是基于紫外线-可见光吸收，荧光（FL）光谱学和荧光寿命的测量所支持的电子转移。该方法已用于健康人的合成样品和新鲜尿液样品中EA的测定，结果令人满意。该方法具有灵敏度高，分析时间短，成本低，操作简便等优点。

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