Fig. 1

a Schematic illustration of the preparation of mag-SiCC. The mag-CC was produced using CO₂ gas; then it was subjected to silica coating process to provide amine functional group on mag-SiCC for aptamer conjugation. b Schematic illustration of preparing the bio-hybrid inorganic microparticles. The aptamers were conjugated to the mag-SiCC for specific capturing of oxytetracycline