A Dopamine Sensor Based on Pre-Concentration by Magnetic Nanoparticles

Figure 9

Calibration curve {𝑖_p/𝜇A=102.2(±6.543)/𝜇A+19.39(±1.560)log([DA]/M), 𝑟²=0.997} obtained from variation of the SWV anodic peak current as a function of DA concentration in standard addition solutions. Inset shows square wave voltammograms obtained on the MCPE/MNP in 5.0×10⁻⁶ M DOPADIC solution prepared by standard addition method, inner to outer; 1.0×10⁻⁵, 5.0×10⁻⁵, 1.0×10⁻⁴, and 5.0×10⁻⁴ M DA. Conditions are the same as in Figure 8.