硼酸根亲和修饰磁性金属有机骨架高效测定维生素C片中微量抗坏血酸。

Tiantian Wan, Zulei Zhang, Hailong Wang, Yiwen Yang, Hongmei Wang, Jian Zhang, Yanbo Zeng, Lei Li
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摘要

抗坏血酸(AA)在许多生命过程中起着重要作用。AA的长期营养缺乏会导致坏血病的症状。因此,AA的灵敏定量检测在药物分析、食品工业和诊断应用中是最重要的。在本研究中,一种双功能磁性金属有机框架(Fe3O4@SiO2@通过对磁性UiO-66-NH2表面修饰苯基硼酸,合成了具有选择性和灵敏荧光检测AA的UiO-PBA)纳米粒子。在最佳条件下Fe3O4@SiO2@UiO PBA纳米粒子可在30s内检测AA,在5.0-60μM范围内与AA浓度呈良好的线性关系,检测限为2.5μM(s/N=3)。此外Fe3O4@SiO2@UiO-PBA纳米粒子在高效测定维生素C片中微量AA方面具有良好的选择性和应用潜力。这些结果表明,为开发荧光探针快速灵敏地检测真实样品中的痕量AA提供了一种方便的方法。
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Highly efficient determination of trace ascorbic acid in vitamin C tablets by boronate affinity-modified magnetic metal-organic frameworks.

Ascorbic acid (AA) plays an important role in many life processes. The chronic nutritional deficiency of AA will lead to the symptoms of scurvy. Therefore, the sensitive quantitative detection of AA is most important in the pharmaceutical analysis, food industry and diagnostic application. In this study, a dual-functional magnetic metal-organic frameworks (Fe3O4@SiO2@UiO-PBA) nanoparticles was synthesized by modifying phenylboronic acid to the surface of magnetic UiO-66-NH2 via postsynthetic modification for selectively and sensitively florescent detection of AA. Due to the abundant amino groups and grafted phenylboronic acid, the proposed nanoparticles have the dual properties of hydrophilicity and boronate affinity. Under optimum conditions, the obtained Fe3O4@SiO2@UiO-PBA nanoparticles can detect AA within 30 s, and has a good linear relationship with the concentration of AA in the range of 5.0-60 μM with a detection limit of 2.5 μM (S/N = 3). In addition, the prepared Fe3O4@SiO2@UiO-PBA nanoparticles showed excellent selectivity and great potential application in the highly efficient determination of trace AA in vitamin C tablets. These results indicated that a convenient method was proposed to develop fluorescent probes for rapid and sensitive detection of trace AA in real samples.

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