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

Figure 4

XRD spectra of the blank 1-PCL and the Ropi-loaded 1-PCL microsphere (a) and the blank 4-PCL and the Ropi-loaded 4-PCL microsphere (b) and comparison between the blank 1-PCL and the blank 4-PCL (c).

(a)

(b)

(c)