Comparative analysis and mechanistic insights into polysorbate 80 stability differences in biopharmaceutical buffer...

Area of Science:

• Pharmaceutical Science
• Biochemistry
• Materials Science

Background:

• Polysorbate 80 (PS80) is a critical excipient for protein stabilization in biopharmaceuticals.
• PS80 degradation is a significant industry challenge impacting drug product quality.
• Understanding buffer effects on PS80 stability is essential for formulation development.

Purpose of the Study:

• To evaluate the impact of common pH/buffer systems on Polysorbate 80 stability.
• To elucidate the degradation pathways and influencing factors of PS80 in biopharmaceutical buffers.
• To provide guidance for selecting appropriate buffers to ensure PS80 integrity.

Main Methods:

• Assessed PS80 stability across various pH/buffer systems (histidine, acetate, succinate, citrate, phosphate, tris).
• Investigated the role of pH and metal ions in PS80 degradation.
• Analyzed buffer agent interactions with metal ions, including chelation capacity.

Main Results:

• PS80 degraded most rapidly in histidine buffer, followed by acetate and succinate; it was stable in citrate, phosphate, and tris buffers.
• Degradation was pH-dependent, with oxidation being the primary pathway, often triggered by metal ions.
• Buffer agents influenced oxidation; most buffers chelated metal ions, inhibiting oxidation, unlike histidine which formed pro-oxidant complexes.

Conclusions:

• Buffer choice significantly impacts Polysorbate 80 stability in biopharmaceutical formulations.
• Histidine buffer accelerates PS80 oxidation, particularly at higher pH.
• Citrate, phosphate, and tris buffers provide excellent PS80 stability, offering a basis for formulation design.