Solid-state chemical stability of proteins and peptides

Area of Science:

• Pharmaceutical Sciences
• Biochemistry
• Chemical Engineering

Background:

• Peptide and protein drugs require stabilization for storage, often achieved through solid-state formulation.
• Solid-state formulations are susceptible to chemical degradation, impacting drug efficacy and shelf-life.

Purpose of the Study:

• To review major chemical degradation reactions affecting solid-state peptides and proteins.
• To discuss physical and chemical factors influencing these degradation pathways.
• To aid formulation scientists and guide future research in biopharmaceutical stability.

Main Methods:

• Literature review of chemical reactions in solid-state peptide and protein formulations.
• Analysis of factors influencing degradation kinetics, including temperature, moisture, excipients, and physical state (amorphous vs. crystalline).

Main Results:

• Identified key degradation reactions: deamidation, peptide bond cleavage, oxidation, Maillard reaction, beta-elimination, and dimerization/aggregation.
• Highlighted the significant impact of temperature, moisture content, excipients, and formulation physical state on reaction rates.
• Provided a comprehensive overview of solid-state instability mechanisms for peptide and protein drugs.

Conclusions:

• Solid-state peptide and protein drugs are prone to various chemical degradation pathways.
• Controlling environmental factors and formulation properties is crucial for enhancing the stability of these biotherapeutics.
• Further research is needed to fully elucidate and mitigate solid-state degradation processes.