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Powder porous carbon (PPC) has been fabricated by using corncob, a by-product of corn production, through a simple calcination process. The relevant carbon material retains an intrinsic porous structure and has a large specific surface area of 577.15 m 2 /g. The oxidase-like and peroxidaselike activities of porous carbon based on corncob are explored in the pH range of 2.0-8.0, and temperature between 15 and 60 °C, and are optimal at physiological temperature. According to fluorescence and scavenger meas-urements, the catalytic mechanism of porous carbon with semi-graphitized structure is from the active species including •OH radicals and •O 2 radicals. Taking advantages of catalytic performance, a colorimetric biosensor is designed for the determination of AA with a linear range of 8 to 90 μM and a limit of detection (LOD) of 2.65 μM (S/N = 3). The result proves a sustainable and environment friendly route to establish a biosensing system with porous carbon as highperformance peroxidase mimetic.

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