Betulinic Acid Nanogels: Rheological, Microstructural Characterization and Evaluation of their Anti-inflammatory Activity

Author(s): Dalis S. Sosa-Gutierrez, Jorge F. Toro-Vazquez, Cynthia Cano-Sarmiento, Peter Grube-Pagola, Alejandro Aparicio-Saguilan, Cristobal Torres-Palacios, Andres A. Acosta-Osorio*, Hugo S. Garcia*

Journal Name: Current Drug Delivery

Volume 18 , Issue 2 , 2021


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Graphical Abstract:


Abstract:

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.

Keywords: Nanogel, betulinic acid, inflammation, auricular edema, skin, microspheres.

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Article Details

VOLUME: 18
ISSUE: 2
Year: 2021
Published on: 17 August, 2020
Page: [212 - 223]
Pages: 12
DOI: 10.2174/1567201817999200817154003
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