Development and evaluation of physical stability from O/ W lotions containing sunscreens

Abstract

The objectives of this study were to develop and to evaluate the physical stability of O/W lotions containing 6% (w/w) of the sunscreen octylmethoxycinnamate (OMC) or methyl benzylidene camphor (MBC). The formulations were stored at room temperature, for six months and during this period its macroscopic characteristics, viscosity and rheological behavior, oil indexes, spreading properties and Sun Protection Factor (SPF) were evaluated. The results demonstrate that both formulations were stable for six months. The SPF values were significantly (P < 0.05) higher for MBC formulation. On the other hand, the OMC formulation presented significantly (P < 0.05) higher spreading and lower viscosity values during the storage period.