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Fourier-transform infrared spectroscopy. FTIR spectra showed (A) the synthesized MNPs, (B) the spray-dried alginate (i), and the DDS composed of MNPs, alginate, and EPO (ii). The FTIR spectra of the spray-dried alginate and DDS showed that the DDS FTIR spectrum featured a peak characteristic of Fe–O at 589 to 630 cm−1, confirming the presence of MNPs and alginate on the DDS.
