In this work, a single particle imaging method based on the total internal reflection (TIR) imaging platform for the sensing and cell imaging of nitrite (NO2-) in the near-infrared region...

UiO-66-NH 2 nanocomposite was post-modified with 4-mercaptophenylboronic acid (MPBA) by the method of in situ hybridization reaction. The hybrid boronate affinity material UiO-NH 2 @P (TEPIC-co-MPBA) was characterized by scanning electron microscopy, X-ray diffraction and Fourier-transform infrared spectroscopy. The material was applied as fluorescent probe for the detection of cis-diol containing compounds based on the boronate affinity mechanism, and exhibited high specific selectively. The proposed method exhibited good linearity for the detection of catechol in the range of 0.50 to 8.00 μg ml À1 . The detection limit was 0.13 μg ml À1 .The tactic was successfully applied to analyze the total polyphenols in tea beverages for catechol, and relative recovery was in 98.86-106.00%. Therefore, this work provided a promising strategy for the recognition of cis-diol containing compounds.boronate affinity, cis-diol containing compounds, detection, UiO-NH 2 hybrid material | INTRODUCTIONGreen tea is one of the most popular drinks in the world. [1] Tea polyphenols, such as catechins and theaflavins, are important functional constituents in green tea. Catechins can effectively inhibit or delay