Excipient
Excipient — An inactive substance added to a peptide formulation to serve as a carrier, stabilizer, or bulking agent during lyophilization or reconstitution.
What Is an Excipient?
An excipient is any inactive ingredient in a peptide formulation that serves a functional purpose: stabilization, solubilization, tonicity adjustment, preservation, or delivery enhancement. Excipient selection is critical for peptide products because peptides are inherently fragile molecules sensitive to pH, temperature, oxidation, and surface adsorption.
Excipient Categories
- Sugars: Trehalose, sucrose, mannitol. Lyoprotectants and cryoprotectants
- Surfactants: Polysorbate 20/80. Prevent adsorption and agitation-induced aggregation
- Antioxidants: Methionine, EDTA, ascorbic acid. Prevent oxidative degradation
- Buffers: Histidine, phosphate, acetate for pH control
- Preservatives: Benzyl alcohol, m-cresol for multi-dose formulations
Frequently Asked Questions
What is Excipient?
An inactive substance added to a peptide formulation to serve as a carrier, stabilizer, or bulking agent during lyophilization or reconstitution.
Why is Excipient important in peptide research?
Excipient is a fundamental concept in formulation 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.