Development and evaluation of micro and nanoparticles containing green coffee oil for dermocosmetic applications

Author(s)

Anna Beatriz Frejuello Limoli Nosari

• Document type: Doctoral Thesis
• Press: Ribeirão Preto.
• Institution: Universidade de São Paulo (USP). Faculdade de Ciências Farmacêuticas de Ribeirão Preto (PCARP/BC)
• Defense date: 2015-12-09

Examining board members

Luis Alexandre Pedro de Freitas; Edemilson Cardoso da Conceição; Lorena Rigo Gaspar Cordeiro; Juliana Maldonado Marchetti

• Advisor: Luis Alexandre Pedro de Freitas; Fábio Cesar Gozzo

Abstract

This study aimed to develop and assess the effectiveness of solid lipid micro and nanoparticles containing green coffee oil, beeswax and alpha-tocopherol. Green coffee oil was quantified by gas chromatography, showing the composition in their palmitic acid (28.74%), linoleic acid (42.77%), oleic acid (12.51%), stearic acid (10.62%), arachidic acid (3.57%) and other fatty acids (1.79%), these values were similar to those described in the literature. The microparticles were prepared by spray congealing method, and the nanoparticles by the technique of hot microemulsion. Microparticles yields ranged 42-58% in size from 63.3 to 101.2 micrometers. Yields of nanoparticles ranged from 96-97% and ranging in size from 249-766 nm. Thereafter the conditions were set for the process of production of micro and nanoparticles, as well as the concentration of green coffee oil, alpha tocopherol and beeswax. A more detailed study of the proportions of GCO, beeswax and alpha-tocopherol was performed with the aid of a planning mixtures evaluating the oxidative stability by Rancimat and thermogravimetric tests. However, under the conditions of this study, these results were not statistically different, so it was chosen the highest concentration of green coffee oil proposal (50%). After these steps, the particles were added in aristoflex® gel, and the green coffee oil in liquid form, forming three gels of the same concentration to compare and assess the viability of micro and nanoparticles prepared against conventionally already commercialized. Studies were conducted on Artemia salina as a preliminary test to evaluate the cytotoxicity of the three gels, whereas at concentrations of 500?g/ml nanoparticles containing gels had a higher mortality than those composed of microparticles or liquid GCO. SPF vitro tests showed low levels of sunscreen, between 0.19 and 0.28, but GCO shows protection against UVB rays can be used as potentiating the action of chemical sunscreen filters. The cell viability tests have shown that even in the form of microparticles or nanoparticles, the GCO and beeswax kept safe for use in topical formulations. In the chemical stability test, the elapsed storage time, the gels containing GCO presented in liquid form palmitic acid levels of 56 and 38% at temperatures of 25°C and 40°C respectively. While the microparticles showed levels of 69 and 53% and the nanoparticles 73 and 69% in those temperatures. In clinical tests, the microparticles showed a better performance for the improvement of the water content of the stratum corneum after 2 hours of application of the product. Already nanoparticles showed the best results for the transepidermal water loss, giving the skin a smaller loss water. The skin permeation tests, no quantification by the method used at any time from the receiving phase, but this study showed higher concentrations of palmitic acid in the dermis of the tests made to the nanoparticles and the stratum corneum of those made to the microparticles. Therefore, opposite the results obtained, the micro and nanoencapsulção of green coffee oil is an interesting alternative to increase the stability of this oil, and promote improvements in their effectiveness (AU)

• FAPESP's process: 12/04071-7 - Development and evaluation of micro and nanotechnology systems containing green coffee oil additive with alpha tocopherol.
• Grantee: Anna Beatriz Frejuello Limoli Nosari
• Support Opportunities: Scholarships in Brazil - Doctorate