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FTIR spectra of mPEG–OC and subproducts. (a) Commercially available oligosaccharide (OC), (b) N-phthaloyl oligosaccharide (NPHOC), (c) commercially available poly(ethylene glycol) monomethyl ether (mPEG), (d) PEG monomethyl ether succinate (mPEG–COOH), (e) PEGylated NPHOC (mPEG–NPHOC), (f) PEGylated oligosaccharide (mPEG–OC).
