BPC-157: structure and analysis

What is BPC-157?

BPC-157 is a synthetic pentadecapeptide — a chain of fifteen amino acids — corresponding to a fragment of a protein found in gastric juice. The sequence is produced synthetically rather than extracted, so the material in the vial has no biological source.

At fifteen residues it sits in the middle of the size range this catalogue covers: substantially longer than a tripeptide such as KPV, considerably shorter than the 43-residue TB-500.

How is BPC-157 produced?

Assembled by solid-phase peptide synthesis: the chain is built one residue at a time on an insoluble resin support, then cleaved from the resin, deprotected and purified — most commonly by reversed-phase high-performance liquid chromatography. The purified material is lyophilized to a dry solid.

The impurity profile that appears on a certificate is a record of where that process was imperfect: deletion sequences from an incomplete coupling, truncated chains, and species retaining a protecting group.

What are the molecular figures for BPC-157?

Calculated from the formula C62H98N16O22, not measured. The average molecular weight counts the natural abundance of each element's isotopes; the monoisotopic mass is the mass of the single most abundant isotopic composition, which is the figure a mass spectrometer is usually compared against.

The expected ions follow from the monoisotopic mass by adding one proton per charge. They are a starting point for recognising a spectrum, not a substitute for one: adducts, salts, modifications and multiply charged species all move the observed m/z, and the certificate reports what was actually measured for a batch.

Adducts, salts, modifications and multiply charged species all move an observed m/z away from any figure calculated here, and a certificate reports what was measured for a batch rather than what was expected of it.

What is the sequence of BPC-157?

BPC-157 is 15 residues long. Written in the one-letter amino-acid code, as the cited record states it:

The sequence is what an identity test resolves. The mass a spectrometer is compared against is the mass this chain implies, which is why a single missing or substituted residue changes the result by an amount that cannot be mistaken for instrument variation — the deletion is detectable rather than invisible.

Sequence information describes the molecule, not the material in a vial. What establishes a specific batch is the identity method and result on its certificate.

How does BPC-157 compare with related compounds?

Related compounds are not interchangeable. Published figures differ between them, and in this catalogue three compounds share a GHRH backbone while several share the same structural class — which is exactly why identity is confirmed analytically rather than inferred from the label.

How is the identity of BPC-157 confirmed?

Mass spectrometry confirms the fifteen-residue chain assembled as intended. At this length the mass difference produced by a single missing residue is unambiguous, so a deletion sequence is straightforward to detect.

The sequence contains no cysteine, so there is no disulfide bond to form or mis-form and no associated identity ambiguity.

Which impurities can appear in BPC-157?

Fifteen residues means fifteen coupling steps, and coupling efficiency compounds: the longer the chain, the more likely a deletion or truncation product appears in the chromatogram. This is the principal impurity class to expect and the one reversed-phase HPLC is well suited to resolve.

The absence of cysteine, methionine and tryptophan means the oxidation pathways that dominate for compounds such as Semax and MOTS-c are not the main concern here.

What does a certificate of analysis for BPC-157 report?

A certificate for a batch of this material names the batch, names the issuing laboratory, and states for each parameter both the method used and the specification the result was measured against. Identity and purity are the two core results; net peptide content states how much of the fill weight is actually peptide.

A certificate belongs to a batch, not to a product line. When a new batch is released it is tested again, and the certificate published against it is that batch's certificate — a previous batch's result is never carried forward.

Is BPC-157 for human use?

No. This page describes structure and analysis. It makes no claim about what this compound does, and none should be inferred from it. Material is supplied for laboratory research use only: it is not a drug, food, dietary supplement, cosmetic or medical device, it is not for human or veterinary consumption, and no dosing, administration or reconstitution guidance is provided for any such use.

References

• BPC-157 — PubChem, National Library of Medicine
• Bpc-157 — ChEMBL, European Bioinformatics Institute
• Stable Isotope Labeling-Based Nontargeted Strategy for Characterization of the In Vitro Metabolic Profile of a Novel Doping BPC-157 in Doping Control by UHPLC-HRMS — Molecules, 2023