Table 2.

The PDI values and surface potentials of as-prepared NPs under different conditions ^a.

Conditions	Ac-DEX		Sp-Ac-DEX		PLGA		Chitosan
4 mg/mL	0.308	−8.8	0.214	16.2	0.160	1.2	0.179	14.3
3 mg/mL	0.112	−7.9	0.253	15.5	0.186	0.9	0.211	12.5
2 mg/mL	0.178	−7.1	0.100	15.1	0.198	−1.3	0.249	11.9
1 mg/mL	0.164	−5.7	0.241	13.9	0.088	0.5	0.175	12.1
1:40	0.184	−5.2	0.197	14.2	0.059	−0.8	0.163	11.2
2:40	0.164	−5.7	0.100	15.1	0.088	0.5	0.175	12.1
4:40	0.210	−6.3	0.097	16.1	0.123	0.3	0.176	11.8
6:40	0.173	−7.4	0.183	16.6	0.239	0.7	0.203	12.8
5.2 × 10−4 mm	0.194	−6.1	0.177	15.6	0.135	0.9	0.215	11.6
8.5 × 10−2 mm	0.184	−5.2	0.100	15.1	0.059	−0.8	0.175	12.1
1.7 × 10−1 mm	0.198	−6.5	0.175	16.2	0.134	−1.2	0.125	12.0

^a The data are arranged such that the first and second subcolumns of each main column represent the PDI and surface potential with a unit of mV, respectively.