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. 2021 Apr 9;10(4):806. doi: 10.3390/foods10040806

Figure 3.

Figure 3

FTIR spectra of the (a) hyaluronic acid; (b) collagen; (c) eggshell waste (ESW), eggshell (ES), and calcium carbonate; and (d) eggshell membrane (ESM) and olive leaf extract (OLE)-loaded eggshell membrane (ESM).