Fig. 2

Preparation and characterization of DSPE-PEG₂₀₀₀-modified quercetin (DQ) and GCA-modified COS (GCOS). A FT-IR spectrum of DSPE-PEG₂₀₀₀-COOH and DQ. B Characteristic peaks of DSPE-PEG₂₀₀₀-COOH and DQ by ¹H-NMR. C MALDI-TOF spectrum of DSPE-PEG₂₀₀₀-COOH and DQ. D FT-IR spectrum of COS and GCOS. E Characteristic peaks of COS and GCOS by ¹H-NMR. a is corresponding to the protons of GCA residues