Table 1. Stability Data of PTA over the Period of 3 Months at 4 °C^a.

parameters	day of preparation	post 15 days	post 30 days	post 60 days	post 90 days
size (nm)	131.57 ± 0.760	154.79 ± 8.902	189.46 ± 14.738	174.89 ± 1.583	204.65 ± 2.028
PDI	0.208 ± 0.013	0.238 ± 0.047	0.296 ± 0.043	0.121 ± 0.012	0.098 ± 0.031
zeta potential (mV)	0.076 ± 0.016	0.091 ± 0.023	0.069 ± 0.199	0.156 ± 0.146	–0.105 ± 0.329

^aValues were in mean ± SD, n = 4.