The optimum SPs formulation was stored for 90 days at 25°C and 4°C. Samples were taken from fresh SPs, after 45 days and after 90 days. The storage effect was evaluated by the comparison between the first and the after storage results in respect of EE%, VS, PDI and ZP.18 (link) Student’s t-test was used to analyze the results statistically using SPSS® program 22.0 (USA). A significant difference was considered at P ≤ 0.05.