Deformable Vesicles with Edge Activators for the Transdermal Delivery of Non-Psychoactive Cannabinoids


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Abstract

Background:Transdermal delivery of highly lipophilic molecules is challenging due to the strong barrier function of the skin. Vesicles with penetration enhancers are safe and efficient systems that could improve the transdermal delivery of non-psychoactive cannabinoids such as cannabidiol and desoxy-cannabidiol. In the last decades, research interest in desoxy-cannabidiol as a potent drug with anti-nociceptive properties has risen. Still, its scarce market availability poses a limit for both research and clinical applications. Therefore, it is necessary to improve the synthesis to produce sufficient amounts of desoxy-cannabidiol. Moreover, also the formulation aspects for this drug are challenging and require to be addressed to meet an efficient delivery to the patients.

Objective:This work aimed to develop innovative phospholipid-based vesicles with propylene glycol (PG), oleic acid (OA), or limonene as edge activators, for the transdermal delivery of highly lipophilic drugs such as non-psychoactive cannabinoids. In particular, desoxy-cannabidiol was selected thanks to its anti-nociceptive activity, and its synthesis was improved enhancing the stereoselectivity of its synthon's production.

Methods:Desoxy-cannabidiol was synthesized by Lewis acid-mediated condensation of p-mentha-2,8-dien- 1-ol and m-pentylphenol, improving the stereoselectivity of the first synthon's production. Transethosomes containing 20-50% w/w PG, 0.4-0.8% w/w OA, or 0.1-1% w/w limonene were optimized and loaded with cannabidiol or desoxy-cannabidiol (0.07-0.8% w/w, 0.6-7.0 mg/mL). Ex-vivo studies were performed to assess both the skin permeation and accumulation of the cannabinoids, as well as the penetration depth of fluorescein- loaded systems used as models.

Results:An enantioselective bromination was added to the pathway, thus raising the production yield of pmentha- 2,8-dien-1-ol to 81% against 35%, and the overall yield of desoxy-cannabidiol synthesis from 12% to 48%. Optimized transethosomes containing 0.6 mg/mL cannabinoids were prepared with 1:10 PG:lipid weight ratio, 0.54 OA:lipid molar ratio, and 0.3 limonene:lipid molar ratio, showing good nanometric size (208 ± 20.8 nm - 321 ± 26.3 nm) and entrapment efficiency (> 80%). Ex-vivo tests showed both improved skin permeation rates of cannabinoids (up to 21.32 ± 4.27 µg/cm2 cannabidiol), and skin penetration (depth of fluorescein up to 240 µm, with PG).

Conclusion:Desoxy-cannabidiol was successfully produced at high yields, and formulated into transethosomes optimized for transdermal delivery. Loaded vesicles showed improved skin penetration of desoxy-cannabidiol, cannabidiol and a lipophilic probe. These results suggest the potential of these carriers for the transdermal delivery of highly lipophilic drugs.

About the authors

Elisa Vettorato

Department of Pharmaceutical and Pharmacological Science, University of Padova

Author for correspondence.
Email: info@benthamscience.net

Marisa Fiordelisi

Department of Pharmaceutical and Pharmacological Sciences, University of Padova

Email: info@benthamscience.net

Silvia Ferro

Department of Pharmaceutical and Pharmacological Sciences,, University of Padova

Email: info@benthamscience.net

Desirè Zanin

Department of Pharmaceutical and Pharmacological Sciences,, University of Padova

Email: info@benthamscience.net

Erica Franceschinis

Department of Pharmaceutical and Pharmacological Sciences,, University of Padova,

Email: info@benthamscience.net

Giovanni Marzaro

Department of Pharmaceutical and Pharmacological Sciences,, University of Padova,

Email: info@benthamscience.net

Nicola Realdon

epartment of Pharmaceutical and Pharmacological Sciences,, University of Padova

Email: info@benthamscience.net

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