Stability
Stability — The ability of a peptide to maintain its chemical integrity, purity, and biological activity over time under defined storage conditions.
What Is Peptide Stability?
Stability is the ability of a peptide to retain its chemical identity, purity, potency, and physical characteristics over time under specified storage conditions. Peptide stability is challenged by chemical degradation (oxidation, deamidation, hydrolysis, racemization) and physical instability (aggregation, adsorption, precipitation).
Stability Factors
- Temperature: Every 10°C increase roughly doubles degradation rate. Store at -20°C (lyophilized) or 2-8°C (solution)
- pH: Most peptides are most stable at pH 4-6. Deamidation accelerates above pH 6
- Moisture: Lyophilized peptides with < 2% residual moisture are most stable
- Light: UV light degrades Trp, Tyr, His. Use amber vials
- Oxygen: Atmospheric O2 oxidizes Met and Cys. Store under nitrogen or argon
Frequently Asked Questions
What is Stability?
The ability of a peptide to maintain its chemical integrity, purity, and biological activity over time under defined storage conditions.
Why is Stability important in peptide research?
Stability is a fundamental concept in quality as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.