Rapid detection of potassium sorbate by nitrogen-doped carbon quantum dots fluorescence probe

Abstract:

Potassium sorbate is an acidic food preservative, which can effectively inhibit the activity of mold, yeast and aerobic bacteria, prolong the storage time of food, and maintain the original flavor of food. In this study, fluorescence nitrogen doped carbon quantum dots (NCQDs) with good water solubility was synthesized by one-step hydrothermal method. Based on the effective quenching of NCQDs by potassium sorbate, a fluorescence probe for rapid detection of potassium sorbate was constructed. Under the optimal experimental conditions, the concentration of potassium sorbate showed a good linear relationship with the fluorescence quenching intensity of NCQDs in the range of 3.0×10-5~ 1.0×10-4 mol/L and 1.0×10-7~3.0×10-5 mol/L, and the detection limit was 9.5×10-8 mol/L. It has been used for the determination of potassium sorbate in soda water and white vinegar with the recoveries of 98.25%~102.7% and 98.33%~101.8%.