4. Conclusions
The proposed HPLC method enabled the separation and quantitative determination of B-3 and OM present in sunscreens. The method was successfully applied in the stability studies of the emulsions. The method is simple, precise and accurate; there was no interference from formulation components. The sample emulsions stored at different temperatures presented similar rheological behavior, at least during the period of the study (3 months). Most of the samples showed a pseudoplastic non-newtonian thixotropic profile. There were no significant changes in the physical and chemical stability of emulsions stored in different packaging material. The studied glass and plastic packaging materials were found adequate for storing referred solar protector emulsions.