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. 2020 Jan 16;12(1):70. doi: 10.3390/pharmaceutics12010070

Figure 6.

Figure 6

Fourier transform infrared spectroscopy (FTIR) spectra of HAPs before and after surface modification (A), after Pip loading at different pH compared to free Pip (B), before and after GA coating (C), and before and after FA conjugation (D).