Document Type : Research Paper
Institute of Advanced Research Studies in Chemical Sciences, University of Sindh, 76080, Jamshoro, Pakistan
The present study investigated the use of citrate-stabilized silver nanoparticles (Cit-AgNPs) as a colorimetric probe for the visual detection of three antidepressants imipramine, citalopram, and sertraline. Colorimetric approach relied on color change of Cit-AgNPs due to aggregation induced by antidepressants. UV-Vis spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), zeta potential, and Fourier transform infrared spectroscopy (FT-IR) were used to characterize Cit-AgNPs before and after the reaction with antidepressants. It was found that surface plasmon resonance band of Cit-AgNPs centered at 400 nm was red shifted with concomitant color change from yellow to reddish brown, dark green, and red due to addition of imipramine, citalopram, and sertraline, respectively. Colorimetric response was linearly related to antidepressants concentration over the calibration range of 2-10 µg mL-1 with detection limits of 0.40, 0.25, and 0.39 µg mL-1 for imipramine, citalopram, and sertraline, respectively. Besides this, the proposed sensing strategy is capable of detecting the cited antidepressants in pharmaceutical preparations, spiked, and real deproteinized blood and urine samples without requiring light sensitive dyes, complicated equipment and organic co-solvents.