Table 1. Formulation Characteristics of Three Batches of VEGF-Loaded Microspheres Prepared with a 50:50 Blend Ratio of Polymer A and B, per Batch and Average Values ± SD for Each Formulation Characteristic.

batch	yield [%]	average size [μm]; CV [%]	feed loading [wt %]	actual loading [wt %]a	loading efficiency [%]
1	74	51; 15	1.00	0.72	72
2	73	52; 30	0.93	0.90	96
3	65	44; 17	1.13	0.76	67
average ± SD	71 ± 5	49 ± 4	1.02 ± 0.10	0.79 ± 0.09	78 ± 16

^aLoading of VEGF in microspheres was determined after destruction of loaded microspheres in DMSO and NaOH. VEGF content was quantified by BCA protein assay.