Magnetic molecularly imprinted polymers as a fluorescent sensor for selective detection of Sudan I in chili powder

In this manuscript, a novel strategy to design and prepare magnetic molecularly imprinted polymers (MMIPs) is proposed. Based on the synthesized MMIPs, a fluorescent sensor for low-cost and fast detection of Sudan I was established. Under the optimal conditions, the fluorescence intensity of MMIPs decreased linearly with the concentration of Sudan I in the range of 1-40 μM, and the detection limit was 0.38 μM. The present fluorescent sensor demonstrated satisfactory performance for the quantification of Sudan I in chili powder, covering a concentration range of 49.66-993.12 mg kg^-1. The LOD was determined to be 17.38 mg kg^-1. Furthermore, the average percentage recovery for both intraday and inter-day precision studies ranged from 98% to 104% and 99% to 105%, respectively. The experimental results indicate that the prepared MMIPs exhibited broad potential for low-cost and fast detection in food safety analysis.