Controlled Release of Ropivacaine from Single-Armed (1-PCL) and Four-Armed PCL (4-PCL) Microspheres

Figure 3

FT-IR spectra of blank 1-PCL (A), blank 4-PCL (B), Ropi (C), Ropi-loaded 1-PCL microsphere (D), and Ropi-loaded 4-PCL microsphere (E).