Abstract
A biodegradable Copolymer of poly(lactic acid-co-lysine)(PLA–PLL) was synthesized by a modified method and novel Arginine–Glycine–Aspartic (RGD) peptides were chemical conjugated to the primary ε-amine groups of lysine components in four steps: I to prepare the monomer of 3-(Nε-benzoxycarbonyl-l-lysine)-6-l-methyl-2,5-morpholinedione; II to prepare diblock copolymer poly(lactic acid-co-(Z)-l-lysine) (PLA–PLL(Z)) by ring-opening polymerization of monomer and l,l-lactide with stannous octoate as initiator; III to prepare diblock copolymer PLA–PLL by deprotected the copolymer PLA–PLL(Z) in HBr/HoAc solution; IV the reaction between RGD and the primary ε-amine groups of the PLA–PLL. The structure of PLA–PLL–RGD and its precursors were conformed by FTIR-Raman and 1H NMR. Low weight average molecular weight (9,200 g/mol) of the PLA–PLL was obtained and its PDI is 1.33 determined by GPC. The PLA–PLL contained 2.1 mol% lysine groups as determined by 1H NMR using the lysine protecting group’s phenyl protons. Therefore, the novel RGD-grafted diblock copolymer is expected to find application in drug carriers for tumor therapy or non-viral DNA carriers for gene therapy.
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Acknowledgements
This research was performed with support from Natural Science Foundation of China via Grant 30572271 and 50673058, Key Foundation Project of Shanghai via Grant 05JC14072. Science and Technology Develop Foundation of Shanghai via Grant 054119539. The author is grateful to Lan Li and Dr Aojia Zhou for discussion to this research.
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Yu, H., Guo, X., Qi, X. et al. Synthesis and characterization of arginine–glycine–aspartic peptides conjugated poly(lactic acid-co-l-lysine) diblock copolymer. J Mater Sci: Mater Med 19, 1275–1281 (2008). https://doi.org/10.1007/s10856-007-3237-9
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DOI: https://doi.org/10.1007/s10856-007-3237-9