Antioxidant
Antioxidant — A molecule that inhibits oxidation of other molecules by neutralizing reactive oxygen species, with glutathione being the primary endogenous peptide antioxidant.
What Is an Antioxidant?
An antioxidant is a molecule that prevents or slows oxidative damage by scavenging reactive oxygen species or chelating pro-oxidant metal ions. In peptide formulation, antioxidants protect oxidation-sensitive residues (Met, Trp, Cys, His) during processing and storage.
Antioxidant Types
- Sacrificial scavengers: Free methionine (0.1-1 mM) preferentially oxidized instead of the peptide
- Metal chelators: EDTA (0.01-0.1 mM) removes Fe2+/Cu2+ that catalyze Fenton oxidation
- Endogenous: Glutathione is the primary intracellular antioxidant peptide
- GHK-Cu: Research peptide with demonstrated antioxidant and gene expression modulating properties
Frequently Asked Questions
What is Antioxidant?
A molecule that inhibits oxidation of other molecules by neutralizing reactive oxygen species, with glutathione being the primary endogenous peptide antioxidant.
Why is Antioxidant important in peptide research?
Antioxidant is a fundamental concept in biology 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.