Table 3.

Apparent drug solubility, zeta potential, and pH of nepafenac eye drop suspensions.

Formulation	Apparent Drug Solubility at 25 °C (mg/mL)	Dissolved Drug Content (%)	Zeta Potential (mV)	pH
A1	1.87 ± 0.03	62.33	−10.9 ± 0.6	6.08 ± 0.23
A2	1.95 ± 0.02	65.00	−10.4 ± 0.3	6.18 ± 0.05
A3	2.23 ± 0.01	74.33	−6.4 ± 0.8	6.09 ± 0.03
A4	1.91 ± 0.02	63.66	−12.1 ± 1.4	6.21 ± 0.09
A5	2.50 ± 0.02	83.33	−7.8 ± 0.9	6.07 ± 0.02
A6	1.89 ± 0.05	63.00	−27.4 ± 1.7	6.13 ± 0.33
A7	1.68 ± 0.01	56.00	−14.4 ± 1.4	6.01 ± 0.23
A8	1.95 ± 0.02	65.00	−14.7 ± 1.2	6.16 ± 0.15
A9	2.61 ± 0.02	87.00	−6.9 ± 1.4	6.08 ± 0.05