Figure 4. Characterization of nanoparticles with nuclear magnetic resonance and Fourier transform infrared spectroscopy. The Fourier transform infrared spectra shown are (A) chitosan peptide nanoparticles, (B) ser-thr-tyr peptide, and (C) chitosan. The nuclear magnetic resonance spectra shown are (D) the chitosan peptide nanoparticles and (E) the ser-thr-tyr peptide.