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| Author(s): |
Renata Fabiane Jorge Tiossi
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ribeirão Preto. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Ciências Farmacêuticas de Ribeirão Preto (PCARP/BC) |
| Defense date: | 2010-11-12 |
| Examining board members: |
Jairo Kenupp Bastos;
Marilisa Guimarães Lara
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| Advisor: | Jairo Kenupp Bastos |
| Abstract | |
Solanum lycocarpum A. St.-Hil. (Solanaceae - Solanum), popular wolf-fruit is a native shrub species and characteristic of the Brazilian Cerrado vegetation. Its fruits are used in folk medicine as diuretic, sedative, anti-spasmodic, antiepileptic and antiophidic. This species belongs to the genus Solanum, known to produce alkaloid heterosides, which possess antitumor activity, including skin anticancer. Skin cancer has concerned the authorities in the world because of its growing rates. Therefore, the search for new active anticancer is paramount. The wolf-fruit furnish an alkaloidic extract, which is rich in a mixture of heteroside alkaloids and composed mostly of solasonine and solamargine. Such compounds have been studied as potential anticancer, because they are relatively selective for tumor cells and, consequently, have low toxicity to health cell. For these reasons, the antitumor potential of this species should be investigated. For that, the fruits were collected, dried and crushed. The dried plant biomass was submitted to acid-base extraction to obtain the alkaloidic extract. The analytical method for the quantitation of the alkaloids in both crude alkaloid extract and plant biomass was developed and validated by HPLC-UV. From the alkaloidic extract, formulations were developed for topical use. These formulations were evaluated by in vitro tests of skin permeation and retention in Franz diffusion cell, for which an analytical method for quantifying solasonine and solamargine was developed, as well. The selection of the most promising formulation for anticancer assay in vivo was based in both, the permeation performance of the formulation in vitro and its skin retention in vivo in hairless health mice. The formulation B, containing crude alkaloid extract 1%, Monoolein 5%, propyleneglycol 5% in Natrosol gel (pH 6.5), showed total dermal retention, which is suitable for future trials of skin anticancer in animal models. (AU) | |