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Effect of storage time on particle size, PDI, and zeta potential for NLC Placebo, NLC Riluzole, and functionalized NLC over 3 months at 5 °C (A) and 25 °C (B). Values are expressed as the mean ± SD (n = 3). Data were analyzed using Tukey’s HSD test, with different letters (a,b) representing statistically significant differences (p < 0.05) for the same formulation at different time points.
