Skip to content
Chemistry & Structure

Excipient

An inactive ingredient added to a peptide formulation to improve stability, solubility, or delivery. Common excipients include mannitol (bulking agent), sucrose (cryoprotectant), and phosphate buffers.

Frequently Asked Questions

What is Excipient?
An inactive ingredient added to a peptide formulation to improve stability, solubility, or delivery. Common excipients include mannitol (bulking agent), sucrose (cryoprotectant), and phosphate buffers.
Why is Excipient important in peptide research?
Excipient 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.

Lyophilization

The freeze-drying process that removes water from a peptide solution by sublimation under vacuum. Creates a stable, shelf-stable powder with a characteristic "puck" or "cake" appearance in the vial.

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.

← Back to full glossary