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Keywords:

  • biosensors;
  • catalytic activity;
  • colorimetry;
  • glucose;
  • graphene oxide
Thumbnail image of graphical abstract

Carboxyl-modified graphene oxide (GO–COOH) possesses intrinsic peroxidase-like activity that can catalyze the reaction of peroxidase substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2 to produce a blue color reaction. A simple, cheap, and highly sensitive and selective colorimetric method for glucose detection has been developed and will facilitate the utilization of GO[BOND]COOH intrinsic peroxidase activity in medical diagnostics and biotechnology.