Peptide bond, laboratory definition

A peptide bond is the amide linkage formed when the carboxyl group of one amino acid joins the amino group of the next, releasing water. A peptide is a chain of those bonds. Proteins are longer chains. The research solids in this catalog are the short end of that range, often about 2 to 50 residues, supplied lyophilized so the chain stays dry until the laboratory opens it.

The bond is also why moisture matters. Hydrolysis cleaves amide bonds. That is a storage fact, not a protocol. See how peptides are discussed as laboratory ligands and peptide structure and stability.