Table IV.

The Zeta Potential Values of Salicylic Acid Niosomes after Being Stored at 4°C for 3 months

Formulation	Zeta potentiala
	0 day	28 days	84 days
Blank pH 3	−16.34 ± 0.23	−3.51 ± 0.15	−3.29 ± 0.32
Blank pH 5	−20.38 ± 0.26	−10.95 ± 0.33	−12.33 ± 0.19
Control pH 3	−15.70 ± 0.29	−2.73 ± 0.05	−2.94 ± 0.42
Control pH 5	−19.06 ± 0.47	−10.12 ± 0.10	−9.56 ± 0.84
DCP pH 3	−22.16 ± 0.32	−4.47 ± 0.18	−5.53 ± 0.72
DCP pH 5	−49.19 ± 1.23	−29.74 ± 1.81	−31.73 ± 1.09
STR pH 3	23.66 ± 0.52	10.91 ± 0.57	6.81 ± 0.45
SC24 pH 3	−2.37 ± 0.17	3.06 ± 0.08	1.38 ± 0.36
SC24 pH 5	−7.55 ± 0.16	−2.91 ± 0.28	−2.78 ± 0.30

^aThe reported data were the average of five measurements (mean±S.D.).