Aflatoxin B (AFB) is the major toxic mycotoxin that contaminates grains at trace levels, necessitating the development of an efficient and simple extraction method to enrich it in samples. Here, magnetic molecularly imprinted FeO nanoparticles (MMIPs) were first synthesized by employing 5,7-dimethoxy coumarin as the template and methacrylic acid combined with styrene as the functional monomers. These MMIPs exhibited excellent selective recognition capabilities for AFB, based on which, a novel molecularly imprinted magnetic inverse opal photonic crystal microsphere (MIP@MIPCM) was fabricated via a droplet-based microfluidic self-assembly technique. The MIP@MIPCMs enabled specific recognition of AFB and were used as an extraction material, achieving a binding capacity of 842.7 ng/mg within 20 min. Coupled with high-performance liquid chromatography (HPLC), a sensitive and accurate analytical method was established for AFB detection with a detection limit of 0.35 μg/kg and recovery rates of 90-109 % in real samples.
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