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(a) Schematic illustration of experimental setup for the label-free amperometric biosensor. (b) Electrochemical signals obtained from CNT electrodes recorded using DPV. The dotted and solid lines correspond to the electrochemical signals from PSA-mAb and after introduction of 1 ng/mL PSA, respectivity. PSA-mAb was covalently immobilized on the CNTs using linkers.
