Detalhes bibliográficos
| Ano de defesa: |
2016 |
| Autor(a) principal: |
Silva, Ana Paula Tasquetto da |
| Orientador(a): |
Rodrigues Junior, Luiz Carlos |
| Banca de defesa: |
Rodrigues, Oscar Endrigo Dorneles,
Silva Júnior, Flávio Manoel Rodrigues da,
Ourique, Aline Ferreira,
Fernandes, Lianda da Silva |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Centro Universitário Franciscano
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Nanociências
|
| Departamento: |
Biociências e Nanomateriais
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/569
|
Resumo: |
The ascorbyl palmitate (AP) has wide application in pharmaceutical, medical and cosmetic products, however, it is easily degraded when used as a free molecule. To overcome this problem, nanostructures have been developed. With the advancement of new products employing nanotechnology, it becomes increasingly essential that in addition to their physical and chemical activity, biological tests are carried out to assess its efficacy and safety. Thus, this study aimed to develop, characterize and determine the physical-chemical stability of nanostructures containing ascorbyl palmitate and evaluate its biological activity in vitro. Lipid nanoparticles (LNAP) and nanoemulsions (NEAP) containing ascorbyl palmitate, and lipid nanoparticles (LNBC) and nanoemulsions (NEBC) without active, have been developed and characterized, and stability was assessed for 90 days (25 ± 2 °C and 5 ± 2 °C). Inicially, the LNAP have a content of 88.90%, pH 4.34, particle diameter of 86.41 nm and zeta potential of -12.20 mV. The NEAP initially presented with a content of 101.47%, pH 4.07, particle diameter of 236.01 nm and zeta potential of -42.43 mV. The NEAP were still characterized by Transmission Electronic Microscopy (TEM), showing spherical morphology. After, they were incorporated into semi-solid bases of Carbopol® Ultrez 10 NF the active in free form (GAP) and associated with nanostructures (GLNAP and GNEAP) and stored for 90 days, for the stability study, by quantifying the content active, determination of organoleptic characteristics and pH determinations. All formulations initially presented a homogeneous aspect and slightly acid pH, around 5.14 to GLNAP, 5.29 to GNEAP and 4.61 to GAP. We obtained a initial concentration of active to GLNAP of 84.89%, to GNEAP of 97.03% and to GPA of 100.48%. However, we observed a decrease in both formulations, in different temperatures, after 90 days of analysis; where at the end of this period, the GNEAP remained with a higher concentration of AP. Finally, we assessed cell viability (MTT), in peripheral blood mononuclear cells (PBMC), in VERO and B16F10 cell; genotoxicity (mitotic index and nuclear anomalies) in PBMC and melanin content in B16F10, for samples of NEAP, NEBC and free AP, in concentrations of 25; 50; 100 and 200 μM. The cell viability assay (MTT) were expressed as percentage of control. The results of the MTT assay after 72h, showed no reduction in cell viability for all concentrations tested for the NEAP, NEBC and free AP, in PBMC. To VERO and B16F10 cells there was a decrease in cell viability for NEAP and NEBC, at concentrations of 100 and 200 μM. By microscopic analysis did not metanucleares changes and chromosomal instabilities in concentrations of NEAP, NEBC and AP free, thus not showing the genotoxicity test applied were verified. According to the present results, it can be concluded that the NEAP showed a higher partial protection to the AP against the instability, and that the nanostructure non-cytotoxic. There was no chromosomal instability in the samples, not showing so genotoxicity. |
