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Characterizations of HAD and siRNA@CS-HAD NPs. A: FTIR spectroscopy of Hyaluronic acid dialdehyde (HAD). B: The morphology of the nanoparticles detected by SEM. C: The particle size distribution of siRNA@CS NPs with or without HAD modification. D: Their stability analysis, the particle size, polydispersity index (PDI) and zeta potential were recorded for 6 days.
