Figure 2.

(A) Schematic structures of the set of DBA-functionalized pA-AuNPs, i.e., aptananozymes, acting as catalysts for the oxidation of dopamine to aminochrome by H₂O₂. (B) Rates of dopamine oxidation to aminochrome in the presence of H₂O₂ by (a–e) aptananozymes I–V, (f) the pA-AuNPs functionalized with scrambled DBA (2a), and (g) the pA-AuNPs separated with DBA (2). All systems are composed of a MES buffer solution, pH = 5.5, 5 mM MgCl₂, 100 mM NaCl, that includes the 5 nM aptananozyme and 5 mM H₂O₂. Error bars derived from N = 3 experiments.