Glossary · 2026-09-24
Scientific lead: Alice Kay, Ph.D.
Cyclic peptide, laboratory definition
A cyclic peptide has its backbone, or a side-chain bridge, closed into a ring. One common ring is a disulfide bridge between cysteines. Another is a head-to-tail bond between the N-terminus and the C-terminus. The ring changes the mass relative to the open chain, so the species on the report has to say which form was calculated.
This catalog does not assign a ring from a product title. The BPC-157 string published here has no cysteine and is filed as a linear sequence on the linear peptide term. Structural context is in structural peptides. Research-use only.
Frequently asked questions
- Is every catalog peptide cyclic?
- No. Read the sequence and the mass species. A title does not establish a ring.
- Does a disulfide always mean the peptide is cyclic?
- A disulfide can close one chain or connect two chains. The report's species line is what you file, not a guess from the word.
Research-use only. BlueNex Labs does not provide medical or veterinary advice. Confirm your institution’s policies before purchase.