Cationic vectors in ocular drug delivery

Area of Science:

• Ophthalmic drug delivery
• Colloidal science
• Materials science

Background:

• Ocular drug delivery faces challenges with rapid precorneal drug loss and poor corneal permeability.
• Cationic submicronic vectors offer a promising solution by interacting with the negatively charged corneal surface.
• This strategy aims to increase drug residence time and enhance penetration for improved ocular therapy.

Purpose of the Study:

• To review the formulation of cationic colloids for ophthalmic drug delivery.
• To discuss key formulation parameters influencing the efficacy of cationic vectors.
• To highlight the importance of positive charge in enhancing ocular drug penetration.

Main Methods:

• Review of literature on cationic liposomes, emulsions, and nanoparticles for ophthalmic applications.
• Analysis of formulation parameters including vector type, size, cationic molecule, pH, and drug characteristics.
• Focus on the role of positive charge in ocular drug delivery.

Main Results:

• Cationic colloidal systems demonstrate potential for improved ocular drug delivery.
• Formulation parameters significantly impact the performance of cationic vectors.
• Positive surface charge is crucial for enhanced corneal residence time and penetration.

Conclusions:

• Cationic liposomes, emulsions, and nanoparticles are effective strategies for overcoming ocular drug delivery barriers.
• Optimizing formulation parameters, especially positive charge, is key to successful ophthalmic drug delivery.
• Further research into cationic colloidal systems can lead to advanced ocular therapeutics.