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UV–vis spectra of AuNPs (2.2 nM) before (in water and in 3-(N-morpholino) propanesulfonic acid (MOPS) buffer) and after the addition of peptides at increasing concentrations (range, 2 × 10–7–1.2 × 10–6 M) of (a) NGFpF, (b) BDNFpF, (c) NGFpF-PC, and (d) BDNFpF-PC. Insets: ΔA–Δλ scatter plots, with arrows indicating different steps of plasmon shifts (I, II). All experiments are conducted in triplicate.
