Detalhes bibliográficos
| Ano de defesa: |
2014 |
| Autor(a) principal: |
Moura, Jaqueline Urban |
| Orientador(a): |
Raffin, Renata Platcheck |
| Banca de defesa: |
Schapoval, Elfrides Eva Scherman,
Rossato, Jussane |
| Tipo de documento: |
Dissertação
|
| 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/525
|
Resumo: |
Mangiferin is a natural bioactive, more specifically a glycosylated xanthone which was originally isolated from Mangifera indica L., mango tree, belonging to the family Anacardiaceae. It has a variety of pharmacological activities already studied, including antioxidant, anti-diabetic, antitumoral, hepatoprotective, antiviral, among others. Mangiferin presents very poor water solubility, and low chemical stability, which makes difficult the formulation of a suitable pharmaceutical drug delivery system. A strategy for preserving the chemical integrity and enhancing the bioavailability of poorly watersoluble drugs is nanoencapsulation. In this way, mangiferin nanocapsule suspensions were prepared at the concentration of 250 μg/mL using interfacial deposition of pre-formed polymer technique containing as polymer Eudragit® S100 and as a co-solvent dimethylsulfoxide (DMSO). The suspensions were characterized by determining pH, particle diameter, polydispersity index, zeta potential, drug content, encapsulation efficiency, release profile and morphology (transmission electronic microscopy - TEM). In order to assess the initial profile of cytotoxicity, cellular viability and irritability tests were conducted through diphenyltetrazolium bromide (MTT) test and Hen’s Egg Test Chorioallantoic Membrane (HET CAM), respectively. Mangiferin nanocapsules showed acid pH, particle diameter of 92 nm, polydispersity index > 0.2, zeta potential of -18.31 mV, encapsulation efficiency of 71.78 % ± 1.54, and drug loading of 88.17 ± 1.80 %. The analytical method validation was performed through studies of specificity, linearity, limit of detection and quantification, robustness, precision and accuracy of high performance liquid chromatography (HPLC) method using a mobile phase of water and methanol(70:30), acidified with acetic acid (pH 3.5), with determination at 254 nm. The method was linear (r = 0.9996) and precise (RSD = 1.71 % for intra-day and RSD = 1.80 % for interdays precision). The accuracy was 94.98 %. The robustness indicated that temperature, flow rate and pH of the mobile phase did not interfere in the analysis. TEM demonstrated that nanocapsules of mangiferin showed adequate morphological characteristics and were not aggregated, presenting homogeneous size. In order to study the release profile, dialysis technique was used, and 54.88% of mangiferin was released to the medium within 24 hours. The results of MTT assay showed no significant difference (p ˂ 0.0 ) in viability of cells treated with 0.75 mg/mL, 1.5 mg/mL and 2.5 mg/mL suspension of mangiferin nanocapsules , when compared with the control. HET CAM test showed that nanocapsules had a slightly irritating profile compared to the negative control, probably due to its acidic pH, which does not impair its use. Based on these results, we can conclude that mangiferin nanocapsules are a promising alternative for therapeutic use of this drug, especially for oral administration. As future prerspectives, further in vivo and in vitro studies are needed to evaluate its pharmacokinetics and toxicity. |
