Fluorescent chemical sensors to detect drugs, by increasing fluorescence emission and absorption or by shutting down, because they are non-destructive, the ability to show decomposed concentrations, fast response, high accuracy have been considered and used. In this research, a chemical sensor was synthesized PbS functionalized with gelatin quantum dots for Phenylpropanolamine (PPA) drug. The calibration curve was linear in the range of (0.05 to 10.0 µgL−1). The standard deviation of less than (2.0 %), and detection limits (3S/m) of the method (0.05 µgL−1) in time 60 s, 335 nm were obtained for sensor level response PbS Quantum Dot–Gelatin nanocomposites sensor with (99 %), confidence evaluated. The observed outcomes confirmed the suitability recovery and a very low detection limit for measuring the Phenylpropanolamine drug. The method fluorometric introduced to measure Phenylpropanolamine in real samples such as urine and blood was used and can be used for other drugs and hospital samples. The chemical PbS Quantum Dot–Gelatin nanocomposites sensor made it possible as an excellent sensor with good reproducibility. تفاصيل المقالة