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Nitrogen-doped carbon dots as fluorescent probe for detection of curcumin based on the inner filter effect

机译：氮掺杂碳点作为荧光探针，基于内部过滤效应检测姜黄素

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摘要

A facile, economical and green one-step hydrothermal method for N-doped CDs is presented by using citric acid as carbon source and urea as nitrogen source. The as-prepared N-doped CDs possess an average size of 5.23 nm and exhibit a high fluorescent quantum yield of 25.4%, good water solubility, and excellent photostability. The fluorescence of N-doped CDs may be quenched dramatically from curcumin via the inner filter effect. The sensitive detection method of curcumin in aqueous solution was developed with the linear range of 2.0 x 10(-7) to 1.0 x 10(-5) mol L-1 and detection limit of 8.48 x 10(-8) mol L-1 (S/N = 3). The other common ions and related compounds could not interfere with the detection of curcumin enabling good selectivity. The proposed method was successfully applied to the determination of curcumin in urine samples and the recoveries were 95.71-103.81%.
机译：提出了一种以柠檬酸为碳源，尿素为氮源的简便，经济，绿色的一步法水热法。所制备的N掺杂的CD具有5.23nm的平均尺寸，并表现出25.4％的高荧光量子产率，良好的水溶性和优异的光稳定性。姜黄素可通过内部滤镜效应将N掺杂CD的荧光猝灭。建立了姜黄素在水溶液中的灵敏检测方法，线性范围为2.0 x 10（-7）至1.0 x 10（-5）mol L-1，检测限为8.48 x 10（-8）mol L-1 （S / N = 3）。其他常见离子和相关化合物不会干扰姜黄素的检测，从而具有良好的选择性。该方法成功用于尿样中姜黄素的测定，回收率为95.71-103.81％。

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