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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Eur J Pharm Biopharm. 2012 Dec 27;84(1):49–62. doi: 10.1016/j.ejpb.2012.12.012

Figure 2.

Figure 2

(a) ESI-MS spectrum of cysteine-terminated V6K2 peptide; (b) NMR spectra of Ac-PLA macromer and PLA-V6K2 conjugate. The marked peaks are for hydrogens of the peptide main chain (AA), lactide (LA), lysine (Lys), and acrylate group (AC); (c) XPS spectra of cysteine-terminated V6K2, PLA-EG, and PLA-V6K2 NPs in the 392–402 eV region, corresponding to the binding energy of nitrogen 1s electrons.