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

Table 2

Optimal preparation parameters of the microspheres.

Group^1	[Ropi] (mg/mL)	[PCL] (mg/mL)	[PVA] (mg/mL)	O/W ratio	D[4,3] (μm)	Span	DL (%)	EE (%)
1	2	5	1	1/5	41.56	2.008	75.39%	22.64%
1a	1	3	1	1/8	73.31	3.737	70.51%	21.83%

¹Group 1 used 1-PCL as a carrier. Group 1a used 4-PCL as a carrier.