Is a peptide bond the same as a disulfide bond?

No. The peptide bond is the backbone amide. A disulfide is a side-chain link between cysteines. A sequence can have both. The Certificate of Analysis mass reflects the form the report measured.

Glossary · 2026-09-24

Scientific lead: Alice Kay, Ph.D.

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 catalogue 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.

Frequently asked questions

Is a peptide bond the same as a disulfide bond?: No. The peptide bond is the backbone amide. A disulfide is a side-chain link between cysteines. A sequence can have both. The Certificate of Analysis mass reflects the form the report measured.

Research use only. BlueNex Labs does not provide medical or veterinary advice. Confirm your institution’s policies before purchase. How a comparison or class note is checked sits on documentation standards. The biochemist of record is Alice Kay, Ph.D.