Abstract
Consumption of adulterated milk poses serious health hazards to people of all age groups. Salicylic acid, being a common milk adulterant is added at a rate of 0.04–0.05 % to prolong its shelf life yielding severe health complications. Despite a global regulatory ban, deliberate use of this adulterant remains widespread. This study addresses the problem by developing an effective sensing scheme using biologically synthesized silver nanoparticles from watermelon rind extract to detect salicylic acid in raw milk. Characterizations were performed through UV–Vis spectrophotometry, X-ray diffractometer, Field Emission Scanning Electron Microscopy, Zeta Sizer, Transmission electron microscopy, and Fourier transform infrared spectroscopy. The colorimetric sensing method indicates the presence of salicylic acid by a change in colour from bright yellow to brown/black. The limit of detection is found to be 0.55 ppm, where the dynamic range of detection was between 0.1 ppm to 15 ppm, with a recovery rate of 96 %.
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