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Synthesis steps of different polymers.
Notes: (A) d,l-Lactide; (B) mPEG-PDLLA; (C) mPEG-PDLLA-Phe-NBOC; (D) mPEG-PDLLA-NH2; (E) mPEG-PDLLA-PBLG and mPEG-PDLLA-PBLL; (F) mPEG-PDLLA-PLG and mPEG-PDLLA-PLL.
Abbreviations: mPEG, methoxy PEG; PDLLA, poly(d,l-lactide); PEG, poly(ethylene glycol); Phe-NBOC, N-(tert-butoxycarbonyl)-l-phenylalanine; PLG, polyglutamate; PLL, poly(l-lysine); PBLG, poly(γ-benzyl-l-glutamate); PBLL, poly(γ-benzyl-l-lysine); TFA, trifluoroacetic acid.
