High‐throughput Photoactive Magnetic Microrobots for Food Quality Control

Abstract Ensuring food quality and safety according to stringent global standards requires analytical procedures that are accurate, cost‐effective, and efficient. This present innovative high‐throughput microrobots designed for the detection of antioxidants in food samples. These microrobots consist of photocatalytic bismuth subcarbonate anchored on silica‐coated magnetite nanoparticles. Upon exposure to UV light, they generate reactive oxygen species via photocatalysis, which oxidize the colorless dye into a green‐colored radical cation. The presence of antioxidants inhibits this reaction, allowing for the quantification of antioxidant activity. The magnetic Fe₃O₄/SiO₂ core enables steering of the microrobots using a transverse rotating magnetic field, facilitating automated assays on a custom‐designed 3D‐printed sensing platform. This results demonstrate that these magneto‐photocatalytic microrobots can perform automated, high‐throughput assessments of food quality, representing a significant advancement in food analysis technology.