摘要：Graphical abstractBiosynthesized gold nanoparticles have shown remarkable size dependent colorimetric detection towards arginine among the twenty-three amino acids.Display OmittedHighlights•Biosynthesized gold nanoparticles (AuNPs) of different size and shape was utilized for the visible detection of amino acids.•The nanoparticles have shown sensitive and selective detection towards arginine among twenty-three different amino acids.•The effect of pH on the detection of arginine is investigated.•The AuNPs are able to sense 10−6 M of arginine in aqueous solution.AbstractThe present work has been proposed for a simple colorimetric detection of arginine by the use of four different types of biogenic gold nanoparticles (AuNPs), stabilized by aqueous pomegranate (Punica granatum) peel extract. The detection is based on the shift in the surface plasmon resonance peak (SPR), which is attributed to the aggregation of the biosynthesized NPs in presence of arginine. The detection limits of arginine is 10−6 M. We have also examined the effect of pH, sensitivity and selectivity of the AuNPs towards the analyte. The present system is simple, cost effective, eco-friendly, and avoids tedious procedure for surface modification of nanoparticles to detect the analytes from aqueous solution.
