Table I.

The Codes and Compositions of the Microspheres

Code	Type of PLGA	Drug/polymer ratio	PVA (%)	Homogenization speed (rpm)	Homogenization time (min)
F1	85:15 (Mw, 50,000–75,000)	1:10	0.5	8,000	1
F2	75:25 (Mw, 66,000–107,000)	1:10	0.5	8,000	1
F3	50:50 (Mw, 40,000–75,000)	1:10	0.5	8,000	1
F4	50:50 (Mw, 5,000–15,000)	1:10	0.5	8,000	1
F5	50:50 (Mw, 40,000–75,000)	1:10	0.5	8,000	2
F6	50:50 (Mw, 40,000–75,000)	1:10	0.5	9,500	1
F7	50:50 (Mw, 40,000–75,000)	1:5	0.5	9,500	1
F8	50:50 (Mw, 40,000–75,000)	1:5	0.5	8,000	1
F9	50:50 (Mw, 40,000–75,000)	1:5	1.0	8,000	1
F10	50:50 (Mw, 40,000–75,000)	1:5	2.0	8,000	1
F11	50:50 (Mw, 40,000–75,000)	1:5	0.2	8,000	1
F12	50:50 (Mw, 40,000–75,000)	1:5	0.1	8,000	1