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(A) Proposed mechanism for the formation of LGA-modified PEI polymers. (B) Fourier transform infrared spectroscopy (FT-IR) analysis of PLGA, PEI and LGA-PEI polymers. The formation of an amide bond between the PLGA and PEI is indicated by the -OC-NH- stretching absorption at 1651.6 cm-1. (C) NMR spectroscopy analysis.
