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Betulinic Acid Nanogels: Rheological, Microstructural Characterization and Evaluation of their Anti-inflammatory
Dalis S Sosa-Gutierrez1, Jorge F Toro-Vazquez2, Cynthia Cano-Sarmiento3
1UNIDA, Tecnologico Nacional de Mexico/IT de Veracruz, Miguel Angel de Quevedo 2779, Veracruz, Ver, 91897, Mexico.
Background:
Betulinic Acid (BA) is a lipophilic compound with proven beneficial results in topical inflammation. Nanogels (NG) are carriers of bioactive compounds with properties that make them good candidates to treat skin diseases.
Objective:
The objective of this study was to evaluate the anti-inflammatory activity of BA carried in NG.
Methods:
NG were composed of a nanoemulsion and a crosslinking agent (Carbopol 940®) applied at three concentrations (0.5, 1, and 1.5 %) and three activation times (6, 12 and 24 h). In order to select the optimal formulation, the NG were characterized mechanically and micro-structurally followed by evaluation of the BA anti-inflammatory activity in an in vivo model of auricular edema. We determined the edema inhibition activity as percent weight. Additionally, the anti-inflammatory activity of NG was validated through histological analysis.
Results:
The formulation with the best viscoelastic properties was the one prepared with 0.5% carbopol and 6 h of activation. Microstructural examination of this formulation showed mostly spherical structures with a mean diameter of 65 nm. From the evaluation of edema and the histological analyses, we established that the NG of BA produced 52% inhibition. In contrast, a conventional gel and free BA produced 28% and 19% inhibition, respectively.
Conclusion:
The NG of BA were found to be good vehicles to treat skin inflammation.
