Laboratory reference guide

Peptide nomenclature glossary: aliases, fragments, salt forms and purity terms

Aliases, fragments, salt forms and purity terms — how to match a catalogue name to the exact molecule you need.

Research use only. The information below concerns laboratory reference materials for in-vitro research and makes no medical, therapeutic, diagnostic, cosmetic or performance claims.

Peptide reference materials are sold under many overlapping names, aliases and abbreviations. This glossary clarifies the terms a researcher needs to match a catalogue entry to the correct molecule.

Common names and aliases

  • BPC-157 — a synthetic pentadecapeptide reference standard.
  • TB-500 — a commercial alias used inconsistently for Thymosin β4-related materials; the exact sequence and terminal modifications must be stated.
  • CJC-1295 No-DAC — a market designation generally used for Mod GRF (1-29), distinct from the albumin-binding compound named CJC-1295 in primary literature.
  • Ipamorelin — a pentapeptide reference standard.
  • GHK-Cu — the copper(II) complex of glycyl-L-histidyl-L-lysine; Copper Tripeptide-1 is included as an INCI cross-reference name.
  • MOTS-c — a 16-amino-acid mitochondrial-derived peptide.

Fragments vs full-length

A fragment is a defined sub-sequence of a larger peptide with its own sequence, terminal chemistry, molecular formula and mass. An alias alone cannot establish which form is present; confusing a fragment with the full-length molecule leads to incorrect identity and concentration calculations.

Salt forms

Counterions and residual water affect how gross supplied mass relates to peptide amount. Use the exact salt form and lot-specific net peptide content, when reported, when preparing stock solutions.

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