Synthesis and Evaluation of the Preliminary Stability of White Clays Containing Açaí (Euterpe oleracea) and Acerola (Malpighia emarginata) Powder for Topical use

Clays are used in cosmetology because they have moisturizing, rejuvenating and antioxidant properties. Such characteristics are enhanced with the combination of actives, such as açaí powder, rich in antioxidant activities, and acerola powder, which has B complex vitamins, but its highest concentration is vitamin C, thus, the two actives minimize damage against free radicals, promoting an improvement in the appearance of the skin. The formulations were developed at three different concentrations, where they were stored in polyethylene pots and underwent preliminary stability tests, where they were subjected to six cycles of thermal stress, since, at the end of each cycle, control parameters were analyzed quality, such as organoleptic characteristics, such as color, odor and appearance, to assess instabilities in formulations. Thus, pH and density values were also determined. In addition, during the ice-thaw process, the samples remained unchanged in terms of initial color, however, the aspects showed evidence of instability, that is, they showed slight changes, that is, the movements of the dispersed active particles to the edges of the pots. In addition, the pH values ranged from 5.0 to 5.5, since it is the appropriate pH value for the skin, as it resembles the stratum corneum, which has a pH of 5.5. In the same follow-up, the results referring to density, showed a high coefficient of variation, but during the statistical analyses, the formulations remained stable, that is, they are suitable for the next test steps.