A Dopamine Sensor Based on Pre-Concentration by Magnetic Nanoparticles

Figure 6

(a) Typical FTIR spectrum of the MNPs (A), MNP/DA_(stirred) (B), and MNP/DA_(sonicated) (C). MNP/DA_(stirred); stirred 200 mg MNPs for 30 min in 200 mL PBS, pH=7.0, containing 1.0×10⁻³ M DA. MNP/DA_(sonicated); sonicated 200 mg MNPs for 30 min in 200 mL PBS, pH=7.0, containing 1.0×10⁻³ M of DA. (b) UV-Vis spectrums of Fe₃O₄ MNPs (A), Fe₃O₄/DA (B) and DA molecule (C).

(a)

(b)