Fig. 2

Photostability evaluation of OXR, DHO, and their NLCs. (A) The change of physical appearance of aqueous solutions and NLC formulations of OXR and DHO during storage at room temperature in the conditions of with and without light exposure for 15 weeks. The remaining amounts of drugs during 15 weeks were analyzed by using HPLC: Free OXR and OXR-NLC (B), and free DHO and DHO-NLC (C). Data are presented as mean ± s.d. (n = 3). Statistical significance: * p < 0.05 and *** p < 0.001 vs remaining amount of drug at 0 week.