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The eATRP-based SI-GOP is easy to operate and low-cost as an amplification strategy. Under optimal conditions, the detection limit for trypsin activity can be down to 0.016 mU mL-1 (~2.68 pM or ~0.064 ng mL-1). As the current signal increases with trypsin activity, this trypsin biosensor is less susceptible to false positives due to the signal-on mode. Moreover, it is highly selective and applicable to inhibitor screening and the assay of trypsin activity in the presence of complex biological matrices. Taking together, this electrochemic