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Stability of different NLC formulations in various storage conditions: (a) Aqueous solution with normal pH; (b) Aqueous solution with low pH; (c) Three freeze–thaw cycles (one freeze cycle represents 12 h storage at −20 °C and one thaw cycle represents 12 h storage at room temperature). Means ± SD are shown (note that in most cases, SD values are too small to be seen on the figure). * p < 0.05 when compared with the day 0.
