Detection of di(2-ethylhexyl) phthalate in edible vegetable oils using a sensitive aptasensor based on carbon nanomaterials and copper metal-organic framework

In this work, we designed a simple, disposable, highly sensitive electrochemical aptasensor to detect di(2-ethylhexyl) phthalate (DEHP) in edible vegetable oils. The aptasensor was created by decorating polyaniline multi-walled carbon nanotubes (PANI-MWCNTs), Cu metal-organic framework (CuMOF), and gold nanoparticles (AuNPs) on a screen printing carbon electrode (SPCE). With its large surface area , CuMOF modified the electrode by improving the adhesion rate of gold nanoparticles , thereby improving the detection limit of the sensor. The distinct peak in the square wave voltammetry (SWV) was used to measure DEHP. The sensor had high stability, excellent repeatability, reproducibility, and specificity, with a wide linear range (0.1–100 ng/mL) and a low detection limit (0.03 ng/mL). When the aptasensor was used to analyze the DEHP content in edible vegetable oils, the recovery rate was between 95.11 % and 98.29 %, and the results were consistent with the GC-MS measurements.