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(a) Typical FTIR spectra of PTX-loaded dried G4-EG(NaOH)1.0 hydrogel (green line: PTX-rich region; blue line: PTX-poor region), (b) micrograph of PTX-loaded dried G4-EG(NaOH)1.0 hydrogel, (c) FTIR image of PTX-loaded dried G4-EG(NaOH)1.0 hydrogel using absorbance around 3000–3500 cm−1 (hydroxyl groups of PGD matrix), (d) FTIR image of PTX-loaded dried G4-EG(NaOH)1.0 hydrogel using absorbance around 1700–1730 cm−1 (carbonyl groups of PTX). Measurement area: 600 × 600 μm.
