Table 2.

Stability study of optimal formulation F 2 at different temperatures

Temperature	Time (days)	Size (nm)	PDI	ζ potential (mV)	Encapsulation efficiency (% w w−1)	pH	Viscosity (η)
25°C	1	126 ± 27	0.22 ± 0.08	−40.7 ± 2.3	91.9 ± 1.2	7.2 ± 0.0	0.181 ± 0.003
	7	127 ± 29	0.23 ± 0.09	−40.8 ± 2.9	91.6 ± 1.7	7.2 ± 0.0	0.181 ± 0.007
	15	128 ± 37	0.22 ± 0.04	−40.5 ± 3.6	91.3 ± 1.9	7.2 ± 0.0	0.181 ± 0.006
	30	129 ± 40	0.21 ± 0.07	−40.2 ± 3.1	90.9 ± 2.1	7.2 ± 0.0	0.180 ± 0.006
	90	131 ± 46	0.21 ± 0.05	−41.7 ± 4.5	90.3 ± 1.8	7.2 ± 0.0	0.180 ± 0.005
4°C	1	126 ± 25	0.23 ± 0.07	−39.5 ± 2.0	91.9 ± 1.6	7.2 ± 0.0	0.181 ± 0.006
	7	123 ± 29	0.22 ± 0.06	−40.6 ± 3.4	91.8 ± 1.3	7.2 ± 0.0	0.181 ± 0.009
	15	121 ± 32	0.21 ± 0.08	−40.5 ± 3.8	91.6 ± 1.4	7.2 ± 0.0	0.181 ± 0.004
	30	123 ± 37	0.20 ± 0.07	−38.1 ± 4.3	91.2 ± 1.5	7.2 ± 0.0	0.181 ± 0.009
	90	121 ± 39	0.21 ± 0.09	−39.7 ± 5.7	90.9 ± 1.8	7.2 ± 0.0	0.181 ± 0.007

Each result represents mean ± SD (n = 3). PDI, polydispersity index.