Table 1.

The average particle size, zeta potential and poly dispersity index of nanoparticles against storage time at 4 °C (P > 0.05) (n = 3, x̅  ± s).

Time(d)	average particle size(nm)	zeta potential(mV)	Polydispersity index
0	228.09 ± 35.35	−7.74 ± 0.91	0.2043 ± 0.053
10	233.29 ± 43.52	−7.63 ± 1.26	0.1734 ± 0.048
20	235.96 ± 48.71	−7.58 ± 0.48	0.1907 ± 0.018