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Schematic illustration of an electrochemical aptasensor. (A) Conductive polymer/gold self-assembled nanocomposite [76]. (B) Aptamer–metal ion nanoscale metal organic framework (MOF) electrochemical biocodes for detection of multiple antibiotics [78]. (C) The target-induced signal probe transfer mechanism [79]. (D) Preparation of BSA-directed SnOx@TiO2@mC nanocomposites and application to tobramycin detection [81].
