A facile, fast and intelligent fluorescent sensing strategy for Sudan I detection based on perovskite quantum dots encoded hollow imprinting microspheres

Due to the globalized supply of food and rapid development of the food industry, food contamination has become a leading cause of food safety problems. In this study, a fluorescent sensing system for the fast and sensitive analysis of Sudan I was developed based on hollow molecularly imprinted polymers and a fluorescent encoding technique by using CsPbX 3 perovskite quantum dots as the fluorescent elements. The introduction of hollow structure provided a high loading capacity, faster encoding efficiency, and shorter detection time. After loading Sudan I, the fluorescent intensity was obviously quenched. Under the optimized detection conditions, this analysis method achieved good linearity in the range of 0.1–300 μg L −1 , a limit detection of 0.05 μg L −1 , and spiked recoveries of 94.91 %–105.36 % in food samples. The whole detection process can be completed within 10 min. Importantly, this work also provided a smartphone-assisted intelligent detection platform for the visual and real-time analysis of Sudan I.