Fig. 4From: Facile synthesis of boronic acid-functionalized magnetic nanoparticles for efficient dopamine extractiona Standard curve of dopamine (DA) concentration vs. fluorescence intensity of polydopamine (PDA) at 463 nm. b Comparative fluorescence spectra of PDA obtained from DA that remained in supernatant before and after adsorption using 3-aminophenylboronic acid-functionalized magnetic silica (Fe3O4@SiO2@APBA) nanoparticles at pH 8.5Back to article page