Injectable, long-acting PLGA formulations: Analyzing PLGA and understanding microparticle formation

Area of Science:

• Polymer Chemistry
• Materials Science
• Pharmaceutical Sciences

Background:

• Injectable, long-acting depot formulations utilize poly(lactide-co-glycolide) (PLGA) polymers.
• Limited FDA-approved PLGA formulations and lack of generic options highlight challenges in understanding PLGA.
• Current characterization methods for PLGA, including non-linear structures, are insufficient.

Purpose of the Study:

• To develop novel analytical methods for comprehensive PLGA characterization.
• To enable better understanding of PLGA polymer properties and microparticle formation.
• To facilitate the development of advanced PLGA depot formulations and generic products.

Main Methods:

• Development of new analytical techniques to determine branching in star-shaped PLGAs.
• Establishment of methods to separate PLGA mixtures based on lactide:glycolide (L:G) ratios, independent of molecular weight.
• Application of these methods to complex PLGA formulations.

Main Results:

• Successfully determined the branch number of star-shaped PLGAs.
• Achieved separation of PLGAs with identical molecular weights but different L:G ratios.
• Demonstrated enhanced characterization of complex PLGA systems.

Conclusions:

• New analytical methods provide deeper insights into complex PLGA formulations.
• Improved characterization is vital for developing PLGA depot formulations with controlled drug release.
• These advancements pave the way for more accessible generic PLGA-based medicines.