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FTIR spectra of mPEG–C and subproducts. (a) Commercially available medium molecular weight chitosan (C), (b) N-phthaloyl medium molecular weight chitosan (NPHC), (c) commercially available poly(ethylene glycol) monomethyl ether (mPEG), (d) PEG monomethyl ether succinate (mPEG–COOH), (e) PEGylated NPHC (mPEG–NPHC), (f) PEGylated medium molecular weight chitosan (mPEG–C).
