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. 2017 Sep 6;2(3):17. doi: 10.3390/biomimetics2030017

Figure 1.

Figure 1

Ultraviolet–visible (UV–Vis) absorbance and surface charge of polydopamine-based melanin-mimetic nanoparticles (MMNPs). (a) UV-Vis spectra of purified MMNPs and filtrate removed from crude product via 10 kDa centrifugal filtration. Arrows in (a) indicate the two peaks observed at 280 and 398 nm in the filtrate absorbance spectrum that are absent in the purified MMNP absorbance spectrum. A.U.: Arbitrary units. (b) Zeta potential of MMNPs at pH 2.5–9.0. The isoelectric point is approximately pH 4.0–4.1.