Fig. 3

a Non-specific adsorption of OTC to mag-SiCC and ethanolamine blocked mag-SiCC after GA activation. b Specific capturing of oxytetracycline using bio-hybrid inorganic microparticles (apt-mag-SiCC). OBA aptamer was used to capture OTC (Diclofenac and naproxen were used as counter targets). c Capturing efficiency of OTC in buffer solution and spiked tap water using apt-mag-SiCC. d Repeated usage of apt-mag-SiCC for five times. Capturing efficiency was calculated at each time point