Study of physical-chemical stability in contaminated conditioners by bacteria

This work was carried out accelerated stability study that aims to provide data to predict the stability of the product. Emulsions were analyzed with and without preservatives, deliberately contaminated with Staphylococcus aureus and Pseudomonas aeruginosa and samples with no contaminants. The test formulations were subjected to stress conditions to accelerate the emergence of signs of instability. The conditions used were: heating in oven (45 ± 2 ºC), cooling in the refrigerator (5 ± 2 ºC) and room temperature (22 ± 2 ºC). The samples were evaluated at time zero, 24 hours, 7, 15, 30, 60 and 90. We evaluated the organoleptic characteristics (appearance, color and odor) and the physico-chemical (pH, rheological behavior and density). Based on the results obtained in accelerated stability tests, it was observed that the inoculation of microorganisms do not result in significant changes and did not affect the physico-chemical properties, once the samples did not change, even though all situations in which theoretically would facilitate the process of instability. These results reflect the importance of microbiological control of cosmetic products, once the deliberate contamination of creams did not influence the physical stability of the formulation.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Tomate salada: uma alternativa como fonte de antioxidante para uso tópico

Tomato Salad: An Alternative as Antioxidant Source for Topic Use. Tomato is the principal source of lycopene, a carotenoid with high antioxidant activity which can be used topically as a phytocosmetic to combat skin aging. The aim of this study was to get a lycopene-rich extract from salad tomato pulp. The extract was analyzed using UV/vis spectroscopy, thin layer chromatography and high performance liquid chromatography. Oxidant activity was analyzed using the free radical DPPH method. The presence of lycopene in the salad tomato was confirmed. It was present in the apolar fraction rich in carotenoids, which was 96.70% lycopene. In the evaluation of the antioxidant activity, using the radical DPPH, the extract showed activity (IC(50) = 0,311 mg/mL). We conclude that the salad tomato can be used as a source of antioxidants for topic use