Table 3. Mean volume diameters (dv50%) and encapsulation Efficiency percent of ALA in selected niosomal formulations .

Formulation name	dv 50% (µm) ± SD				Mean span (obtained by Eq. 1)				%EE (Mean ± SD; n=3)
	1 week	1 month	3 months	6 months	1 week	1 month	3 months	6 months
F 1	19.95±1.21	45.71±2.31	138.03±1.87	208.1±6.12	1.44	2.00	1.79	1.36	86.1±0.3
F 3	10.00±1.13	34.67±1.81	52.48±2.70	60.25±2.11	2.18	1.96	1.72	1.73	82.3±0.5
F 7	10.60±1.61	8.70±1.08	11.48±1.38	13.18±1.65	3.15	3.03	3.60	3.55	90.5±0.2
F 8	11.20±1.84	11.68±1.91	15.31±2.3	17.37±1.88	2.60	2.68	3.10	5.65	89.1±0.6
F 9	4.36±0.82	3.31±0.89	3.50±0.91	4.61±1.01	2.41	2.80	3.04	2.81	94.5±0.2