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CVs recorded (A) at the bare CCE in the absence (1), in the presence of 1.0 mM APAP (2) and 5.0 mM AA (3), (B) at the SWCNT/CCE in the absence (1), in the presence of 1.0 mM APAP (2) and 5.0 mM AA (3) and (C) at the same electrodes in the presence of 1.0 mM APAP + 5.0 mM AA (curve 1 and 2), respectively in 0.1 M phosphate buffer solution (pH 7.0). Scan rate: 50 mV s−1.