Self-assembled γ-cyclodextrin as nanocarriers for enhanced ocular drug bioavailability

Area of Science:

• Pharmaceutical Science
• Materials Science
• Drug Delivery

Background:

• Cyclodextrins (CDs) are crucial in pharmaceuticals for enhancing drug solubility and bioavailability via inclusion complexes.
• Gamma-cyclodextrin (γCD) offers superior water solubility, a larger cavity, and a favorable toxicological profile among natural CDs.
• γCD's ability to self-assemble into nano- and microparticles in aqueous solutions is key to its drug delivery capabilities.

Purpose of the Study:

• To review the physicochemical properties and toxicological profiles of γCD and its derivatives.
• To explore the mechanisms of γCD-mediated drug solubilization and complex formation.
• To discuss methods for enhancing drug/γCD complexes and their aggregates for improved drug delivery.

Main Methods:

• Review of physicochemical properties of γCD and its derivatives.
• Analysis of toxicological data, including ocular toxicity.
• Examination of drug solubilization and complexation methods with γCD.
• Discussion of self-assembled drug/γCD complexes in ophthalmic preparations.

Main Results:

• γCD forms stable inclusion complexes with diverse drugs, significantly increasing their solubility.
• Self-assembled γCD structures enhance drug permeability across biological membranes, boosting bioavailability.
• Clinical studies confirm γCD's efficacy and safety for topical ocular drug delivery to anterior and posterior eye segments.

Conclusions:

• γCD represents a well-tolerated, low-toxicity nanocarrier for drug delivery.
• Its self-assembly properties are advantageous for enhancing drug solubility, permeability, and bioavailability.
• γCD-based systems show significant promise for advanced ophthalmic drug formulations.