Inactivated Enterovirus 71 Particle Aggregation Stability: Dynamic Light Scattering Analysis and Stabilizer...

Area of Science:

• Virology
• Vaccine Development
• Biophysical Characterization

Background:

• Inactivated enterovirus 71 (EV71) vaccines are crucial for preventing severe hand, foot, and mouth disease.
• Vaccine quality and stability are significantly influenced by viral particle aggregation.

Purpose of the Study:

• To utilize dynamic light scattering (DLS) for monitoring EV71 particle size and aggregation.
• To comprehensively assess the impact of various environmental stresses on EV71 particle aggregation.
• To identify effective stabilizing agents for EV71 vaccine formulations.

Main Methods:

• Validation of the dynamic light scattering (DLS) technique for viral particle analysis.
• Assessment of EV71 particle size changes under varying pH, ionic strength, temperature, and mechanical stress conditions.
• Systematic evaluation of buffer salts and stabilizers for their ability to inhibit stress-induced aggregation.

Main Results:

• DLS demonstrated robust performance in characterizing EV71 particle aggregation.
• EV71 particles remained stable within a pH range of 7.0-7.5.
• Elevated temperatures (47 °C) and magnetic stirring induced significant viral aggregation.
• Phosphate and citrate buffers showed strong inhibition against heat and stirring-induced aggregation, respectively.
• M199 and Tween 80 effectively mitigated heat and shear stress-induced aggregation, respectively.

Conclusions:

• Dynamic light scattering (DLS) is a reliable method for monitoring viral aggregation in vaccine development.
• Tailored stabilization strategies involving specific pH conditions, buffers (phosphate, citrate), and agents (M199, Tween 80) are key for enhancing EV71 vaccine quality and stability.
• These findings provide critical insights for optimizing EV71 vaccine formulation and ensuring robust quality control.