Desenvolvimento de emulsão de uso cosmético incorporado de polpa de juçara e de extrato de pupunha: estudo da estabilidade e das propriedades antioxidantes
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Data
2019-11-21
Autores
Lima, Beatriz Fernandes de Melo [UNIFESP]
Monteiro, Heitor [UNIFESP]
Orientadores
Braga, Anna Rafaela Cavalcante [UNIFESP]
Tipo
Trabalho de conclusão de curso de graduação
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Resumo
Atualmente produtos de origens naturais tem despertado muito interesse no mercado e gerado produtos com grande valor agregado, entre eles, os pigmentos naturais ganharam destaque uma vez que são muito utilizados no mercado alimentício e de cosméticos, devido ao seu potencial bioativo. Os pigmentos naturais, como antocianinas e os carotenoides, além de adicionar cor aos produtos aos quais são utilizados, apresentam propriedades que agregam valor para seu uso, como exemplo atividade antioxidante. Os compostos bioativos estão presentes em diversos frutos da biodiversidade brasileira, dentre esses frutos destacam-se a juçara (para obtenção de antocianinas) e a pupunha (como fonte de carotenoides), presentes na Mata Atlântica e na Floresta Amazônica, respectivamente e ambas conhecidas pelo seu palmito. Esse trabalho consiste em incorporar a polpa da juçara e o extrato da pupunha em diferentes emulsões de uso cosmético, e então avaliar a estabilidade da cor bem como a atividade antioxidante no produto final. O pH das emulsões foram avaliados utilizando pHmetro, a estabilidade da cor foi determinada com o tempo através do acompanhamento dos parâmetros L, a* e b* com o tempo e, finalmente, a atividade antioxidante dos extratos foi determinada empregando o radical ABTS. Nas amostras de concentração de 2,5% de polpa de juçara, para a base de Polowax e Lanete, foram obtidos valores de atividade antioxidante de 7,7a e 7,03a, respectivamente. As amostras perderam sua coloração inicial, passando de roxo para marrom, devido a uma possível transformação da antocianina em compostos fenólicos de menor peso molecular. Os valores obtidos de atividade antioxidante para as concentrações de extrato de pupunha de 0,25%, 1% e 2,5% foram 3,28a e 3,94ª, indicando que as amostras possuem atividade antioxidante, mas não há aumento desta após 0,25% de extrato incorporada. As amostras de pupunha mantiveram sua coloração amarela em todo o período dos testes. Os experimentos foram realizados em triplicata, utilizou-se a análise de variância (ANOVA) e o teste de Tukey, pelo software PAST, com o nível de significância de 5% (p<0,05).
Currently, products of natural origin have aroused a lot of interest in the market because of a consumption trend, among which natural pigments are highlighted, as they are widely used in the food and cosmetics market. Natural pigments, such as anthocyanins and carotenoids, have properties that add value to their use, as well as conferring value due to their biological effects, and present in various fruits and vegetables, such as juçara pulp, which comes from a tree. distributed in the Atlantic Forest and known for its heart of palm, and as the fruit of peach palm, a tree found mainly in the Amazon, also known for its palm. This work consists of incorporating juçara pulp and peach palm extract in different emulsions for cosmetic use, and then to evaluate color stability as well as antioxidant activity in the final product. The pH of the emulsions was evaluated using pH meter, the color stability was determined over time by monitoring the parameters L, a * and b * over time, and finally the antioxidant activity of the extracts was determined using the ABTS radical. In the samples of 2.5% concentration of juçara pulp for the base of Polowax and Lanete, antioxidant activity values of 7.71a and 7.03a, respectively, were obtained. The samples lost their initial coloration, turning from purple to brown, due to a possible transformation of anthocyanin to phenolics. The antioxidant activity values for peach palm extract concentrations of 0.25%, 1% and 2.5% were 3.28a and 3.94a, indicating that there is antioxidant activity in the samples, but there is no increase after 0.25% extract. The experiments were performed in triplicate, using analysis of variance (ANOVA) and Tukey test, using the PAST software, with a significance level of 5% (p <0.05).
Currently, products of natural origin have aroused a lot of interest in the market because of a consumption trend, among which natural pigments are highlighted, as they are widely used in the food and cosmetics market. Natural pigments, such as anthocyanins and carotenoids, have properties that add value to their use, as well as conferring value due to their biological effects, and present in various fruits and vegetables, such as juçara pulp, which comes from a tree. distributed in the Atlantic Forest and known for its heart of palm, and as the fruit of peach palm, a tree found mainly in the Amazon, also known for its palm. This work consists of incorporating juçara pulp and peach palm extract in different emulsions for cosmetic use, and then to evaluate color stability as well as antioxidant activity in the final product. The pH of the emulsions was evaluated using pH meter, the color stability was determined over time by monitoring the parameters L, a * and b * over time, and finally the antioxidant activity of the extracts was determined using the ABTS radical. In the samples of 2.5% concentration of juçara pulp for the base of Polowax and Lanete, antioxidant activity values of 7.71a and 7.03a, respectively, were obtained. The samples lost their initial coloration, turning from purple to brown, due to a possible transformation of anthocyanin to phenolics. The antioxidant activity values for peach palm extract concentrations of 0.25%, 1% and 2.5% were 3.28a and 3.94a, indicating that there is antioxidant activity in the samples, but there is no increase after 0.25% extract. The experiments were performed in triplicate, using analysis of variance (ANOVA) and Tukey test, using the PAST software, with a significance level of 5% (p <0.05).