First, 1 mL solutions of Mex@MLipo and Mex@Lipo were freeze-dried for 48 h to obtain sample powder, respectively. The sample powder and Mex were characterized by a Fourier transform infrared (FT-IR) spectrophotometer (IRAffinity-1, Shimadzu Corporation, Kyoto, Japan). The wavenumber range from 4000 cm−1 to 400 cm−1 was scanned for 64 repeats, and the scanning process was repeated 3 times.
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