In vivo SPF before and after immersion
SPF determination in vivo showed a value of 7.0 ± 1.6 for the formulation containing free OMC, and a value of 11.5 ± 2.7 for the liposome/OMC formulation (Figure 4). Statistical analysis showed that the in vivo SPF values for the formulations were significantly different. Therefore, it can be concluded that the liposome/OMC was able to increase the SPF of the formulation. The SPF after immersion of the liposome/OMC formulation was 5.8 ± 1.4 (Figure 4). This value was significantly different from the SPF before immersion. Therefore, it can be concluded that the liposome/OMC formulation has low water resistance.