Table 2. Observed Entrapment Parameters for the 12 Formulations of PB Design.

Formulation Number	Percentage Theoretical Drug Loading	Percentage Actual Drug Loading	Percentage Actual PLGA Loading	Entrapment Efficiency
1	20	17.3 ± 0.02	82.7	86.62 ± 0.09
2	20	2.1 ± 0.01	97.9	10.31 ± 0.04
3	20	2.2 ± 0.00	97.8	11.17 ± 0.00
4	11.1	5.5 ± 0.00	94.5	49.26 ± 0.02
5	11.1	7.3 ± 0.01	92.7	65.74 ± 0.13
6	11.1	2.6 ± 0.00	97.4	23.25 ± 0.04
7	33.3	31.0 ± 0.03	69.0	93.07 ± 0.08
8	33.3	29.2 ± 0.02	70.8	87.68 ± 0.05
9	33.3	10.8 ± 0.00	89.2	32.35 ± 0.01
10	20	17.5 ± 0.01	82.5	87.44 ± 0.03
11	20	4.6 ± 0.01	95.4	23.22 ± 0.06
12	20	2.0 ± 0.01	98.0	10.62 ± 0.06