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(A) Differential pulse voltammograms (DPVs) of the CoMoO4 NSs-modified SPE in 0.1 M phosphate buffer solution (PBS) at pH 7.0, containing various concentrations of sumatriptan (0.02, 1.0, 7.0, 15.0, 30.0, 70.0, 100.0, 200.0, 300.0, 400.0, 500.0 and 600.0 μM); (B) Calibration plot of peak current versus sumatriptan concentration in the range of 0.02-600.0 μM
