Elastic liposomes bearing meloxicam-beta-cyclodextrin for transdermal delivery

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Materials Science

Background:

• Topical administration of drugs like meloxicam often faces challenges with skin penetration and bioavailability.
• Beta-cyclodextrin (beta-CD) can form inclusion complexes to improve drug solubility and stability.
• Elastic liposomes are ultra-flexible vesicles known for their skin permeation enhancement properties.

Purpose of the Study:

• To prepare and characterize elastic liposomes encapsulating a meloxicam-beta-cyclodextrin complex for topical administration.
• To evaluate the synergistic effect of beta-cyclodextrin and elastic liposomes on meloxicam's transdermal permeation.
• To assess the potential of this novel formulation for enhanced transdermal drug delivery.

Main Methods:

• Formation of meloxicam-beta-cyclodextrin inclusion complex characterized by DSC, XRD, and FT-IR.
• Preparation of elastic liposomes using the rotary evaporation method.
• Characterization of liposomes (morphology, size, entrapment efficiency, elasticity, stability) and in-vitro release studies.
• In-vitro and ex-vivo (rat skin) permeability studies using artificial membranes and confocal laser scanning microscopy (CLSM).

Main Results:

• The meloxicam-beta-cyclodextrin inclusion complex was successfully formed in a 1:2 molar ratio.
• Elastic liposomes exhibited favorable characteristics for topical delivery.
• The combined formulation demonstrated significantly enhanced meloxicam permeation across artificial membranes and rat skin.
• Confocal laser scanning microscopy confirmed enhanced penetration into deeper skin layers (up to 160 µm).
• The developed formulation achieved a transdermal flux 1.4 and 9.1 times higher than elastic liposomes with meloxicam alone and plain meloxicam solution, respectively.
• A reduced lag time (0.7 h) was observed for meloxicam permeation.

Conclusions:

• Elastic liposomes incorporating a meloxicam-beta-cyclodextrin complex are effective vehicles for enhancing topical meloxicam delivery.
• The formulation leverages the solubilizing effect of beta-cyclodextrin and the permeation-enhancing properties of elastic liposomes.
• This approach shows significant potential for improving transdermal drug delivery of meloxicam.