A perspective overview on lipospheres as lipid carrier systems

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Nanotechnology

Background:

• Lipospheres encapsulate therapeutics for enhanced delivery to deep and peripheral tissues, including the central nervous system.
• Existing literature lacks specific guidance on critical composition and component selection for academic and pilot-scale liposphere processing.

Purpose of the Study:

• To compile key formulation aspects of lipid lipospheres.
• To discuss scale-up techniques and selection criteria for drugs and lipids.
• To detail quality assessment, preliminary screening, and stability considerations.

Main Methods:

• Discussion of melt method, co-solvent, microemulsion, supercritical fluid, spray drying, and spray congealing techniques for liposphere scale-up.
• Explanation of drug and lipid selection criteria for liposphere formulations.
• Review of quality assessment parameters including loading capacity and entrapment efficiency.

Main Results:

• Preliminary screening factors for liposphere formation, such as dimensions and morphology, are detailed.
• Stability and storage issues, including photolysis, are addressed.
• Demonstration of liposphere systems enhancing solubility and permeability for Class II and IV drugs, supported by in vivo outcomes.

Conclusions:

• Lipospheres offer a viable strategy for delivering challenging drug compounds.
• This review provides a framework for the rational design and scale-up of liposphere formulations.
• Liposphere technology shows significant potential for improving therapeutic efficacy through enhanced drug solubility and permeability.