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Chemistry & Structure

pH

A measure of acidity or alkalinity on a scale of 0–14, where 7 is neutral. Most peptides are most stable at slightly acidic pH (4–6). Incorrect pH accelerates degradation through deamidation and aggregation.

Frequently Asked Questions

What is pH?
A measure of acidity or alkalinity on a scale of 0–14, where 7 is neutral. Most peptides are most stable at slightly acidic pH (4–6). Incorrect pH accelerates degradation through deamidation and aggregation.
Why is pH important in peptide research?
pH is a foundational concept in peptide science. Understanding peptide chemistry helps researchers and practitioners evaluate peptide quality, predict stability, and make informed decisions about storage, reconstitution, and formulation.

Related Terms

Buffer solution

A solution that resists changes in pH when small amounts of acid or base are added. Peptide formulations use buffers (acetate, phosphate, histidine) to maintain the optimal pH for stability.

Stability

A peptide’s resistance to chemical degradation over time. Affected by temperature, pH, light, and oxidation. Lyophilized peptides are most stable; reconstituted peptides should be refrigerated and used within 28 days.

Deamidation

A chemical degradation pathway where asparagine or glutamine residues lose their amide group. Deamidation alters peptide charge and structure, reducing biological activity. Accelerated by heat and alkaline pH.

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