Preparo de cremes cosméticos com bentonita intercalada com extrato das folhas de jambo vermelho (Syzyzium malaccense)

Abstract

Bentonite is a colloidal rock, belonging to the group of phyllosilicates, composed of an octahedral sheet of alumina, surrounded by two tetrahedral sheets of silica. Due to its structure in the form of lamellae, it is possible to insert molecules into its structure, such as the extract of medicinal plants. According to recent studies, the alcoholic extract of the leaves of red jambo, known as Syzygium malaccenses, presents antioxidant potential, being the flavonoid miricitrina the plant's marker. Having in mind, the possibility of inserting molecules such as the alcoholic extract of the leaves of the jambo in bentonite, the main objective of the work was to prepare cosmetic creams with bentonite intercalated with extract of the leaves of the red jambo (S. malaccenses). For this, an ethanolic extract was produced from the jambo leaves, these were intercalated in different fractions in pure bentonite, a moisturizing cream was produced and formulations were prepared with bentonite samples that contained jambo. Physicochemical analyses were performed after preparation and after 30 days, preliminary stability tests and antioxidant activity tests, through the sequestration of the DPPH radical, in all the creams produced. In the preliminary stability tests, all emulsions remained stable, despite the bentonite having precipitates in the centrifugation test. The physicochemical characteristics suffered small changes over the 30 days, with the pH being the parameter with the greatest variation, an average of 16.19%. Throughout the study the cosmetic emulsions acquired a slightly darker brown coloration, being validated by the variation of colorimetric parameters. Regarding the antioxidant activity, the pure jambo extract presented an EC50 value of 24.00 mg.L-1, while among all the bentonite samples with jambo, BJ3 presented the highest antioxidant potential, EC50 of 39.37 mg.L-1. The formulations produced did not show antioxidant potential in solutions of 10 to 40 mg.L-1, concentrations used for the jambo extract and the bentonite and jambo samples.