Eptifibatide Microspheres Formulated with Blended Polymers Achieve Identical Performance to Original Polymers

Peptides like Eptifibatide require advanced delivery systems due to their instability and poor bioavailability with conventional methods. Biodegradable polymer-based microspheres offer a promising solution for controlled release, but their development faces significant hurdles. A critical challenge is selecting appropriate, GMP-grade polymers, which are often costly and limited in availability. Customization, when needed, further inflates expenses, creating a barrier to efficient and economical peptide formulation. This gap necessitates innovative approaches to polymer sourcing and utilization to facilitate broader access to advanced peptide therapeutics.

Researchers investigated the impact of using blended polymers on the structural and functional attributes of Eptifibatide-loaded microspheres. They prepared microspheres using two approaches: first, with original/on-shelf polymers, and second, with physically blended polymers. Specifically, polymers R202H and RG502H were blended in various ratios, ensuring polymers with closer IV (intrinsic viscosity) values were selected for blending. The formulated microspheres from both sets were then characterized and compared for their physicochemical properties and drug release performance, aiming to assess their equivalence.

The study successfully demonstrated that Eptifibatide-loaded microspheres formulated using blended polymers exhibited performance identical to those prepared with original, on-shelf polymers. This equivalence was observed across their structural and functional attributes, suggesting that polymer blending does not compromise the critical characteristics required for effective peptide delivery. The findings indicate that the physicochemical properties and drug release profiles, which are crucial for controlled delivery, were maintained despite the use of a customized polymer blend. This approach effectively addressed the challenge of polymer selection without sacrificing product quality.

Specifically, the blended polymer formulations, derived from R202H and RG502H in various ratios, yielded microspheres that were indistinguishable in their overall performance from their counterparts made with single, commercially available polymers.