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Rapid, Scalable Assembly and Loading of Bioactive Proteins and Immunostimulants into Diverse Synthetic Nanocarriers Via Flash Nanoprecipitation

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Recent Advances in Particle Design for High-Concentration Protein Suspension Injectables.

Yijing Huang¹, Chanakya D Patil¹, Kinnari Santosh Arte¹

¹Department of Molecular and Industrial Pharmaceutics, College of Pharmacy, Purdue University, West Lafayette, IN 47907, USA.

|May 4, 2026

Summary

This summary is machine-generated.

High-concentration protein suspensions enable subcutaneous delivery of high-dose therapeutics. This review covers particle formation techniques and their impact on suspension properties for injectable protein drugs.

Keywords:

high-concentration proteins injectability particle production particle properties sedimentation subcutaneous injectables suspension viscosity

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Area of Science:

Biopharmaceutical Formulation
Drug Delivery Systems
Protein Therapeutics

Background:

Subcutaneous administration is crucial for protein therapeutics, but limited injection volumes pose challenges for high-dose drugs.
High drug concentrations (>100 mg/mL) for subcutaneous delivery lead to solubility, viscosity, and stability issues.
High-concentration protein suspensions offer a solution by suspending insoluble protein particles.

Purpose of the Study:

To review particle formation techniques for high-concentration protein suspensions.
To explore relationships between particle properties and suspension performance.
To discuss future directions in injectable protein suspension development.

Main Methods:

Review of particle production approaches for protein suspensions.
Analysis of particle properties influencing suspension behavior (viscosity, injectability, sedimentation).
Examination of protein stability in suspension formulations.

Main Results:

Multiple particle production methods exist for ultra-high-concentration protein suspensions (>200 mg/mL).
Particle characteristics significantly impact suspension viscosity, injectability, and sedimentation.
Protein stability is a key consideration in developing these advanced formulations.

Conclusions:

Particle engineering is vital for successful high-concentration protein suspension development.
Understanding particle-property-performance relationships is essential for optimizing injectable formulations.
Further research is needed to advance the field of high-concentration protein suspensions for subcutaneous delivery.