(AGENPARL) – LONDON (UNITED KINGDOM), gio 01 ottobre 2020
Fluorescence spectroscopy is a significant bio-analytical technique for specific detection of Nitric Oxide (NO) and to broadcast the in vitro and in vivo biological activities of this gasotransmitter. Herein, a benzo-coumarin embedded smart molecular probe (BCM) is employed for NO sensing through detailed fluorescence studies in purely aqueous medium. All the Spectroscopic analysis and literature reports clearly validate the mechanistic insight of this sensing strategy i.e., the initial formation of 1,2,3,4-oxatriazole on treatment of the probe with NO which finally converted to its carboxylic acid derivative. This oxatriazole formation consequences a drastic enhancement in fluoroscence intensity due to PET effect. The kinetic investigation unveils the second and first-order dependency on [NO] and [BCM] respectively. The very low detection limit (16 nM), high fluorescence enhancement (123 fold) in aqueous medium and good formation constant (Kf = (4.33 ± 0.48) × 104 M-1) along with pH invariability, non-cytotoxicity, biocompatibility and cell permeability recognise this probe as very effective one for tracking of NO intracellularly.
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