Peptide Molecular Weight: The Number That Anchors Every Verification

A peptide's molecular weight, or molar mass, is fixed by its sequence: the sum of the constituent residue masses less the water molecule lost at each peptide bond, plus the mass of any modification the molecule carries. It is not a measured property of a particular vial; it is a property of the molecule.

BPC-157, fifteen residues, comes out around 1419.5 g/mol. Epitalon, four residues, around 390.4 g/mol. Every modification shifts the value: C-terminal amidation, N-terminal acetylation, copper complexation, an albumin-binding group. That is precisely why the shifts are useful, because each one is detectable.

Chemical Structure

Mass spectrometry measures the mass of what is in the vial and compares it against the theoretical mass calculated from the target sequence.[1] Agreement within tolerance means the molecule is the one on the label. Disagreement means the wrong compound, the wrong variant, or degradation, and no purity figure repairs that, because purity describes homogeneity rather than identity.

Without a published molecular weight, a mass-spectrometric result has nothing to be checked against by the reader. The supplier can assert that identity was confirmed and the buyer has no way to confirm the assertion. Publishing the value is what makes the certificate auditable rather than merely reassuring.

• ·Take the compound's CAS number or name to a public chemistry database. PubChem indexes most research peptides and publishes formula and molecular weight.
• ·Compare the database value against the supplier's listed value. A listing that is wrong here is reproducing specifications it has not checked, which is informative before you reach the certificate.
• ·On the certificate, compare theoretical mass against found mass. They should agree within the stated tolerance.
• ·Then verify the certificate itself on the testing laboratory's own database rather than on the supplier's site. The full chain is set out in how to verify a peptide COA.

Chemical Structure

Published Certificate

Select strength

10mg12mg20mg

Batch

BPC-CA-26F-10

Purity (HPLC)

99.765%

Measured content

10.98 mglabelled 10 mg

Laboratory

Janoshik

Verify on the lab’s own databaseAll published certificates

Molecular weight and vial mass are unrelated numbers that get conflated by new buyers surprisingly often. Molecular weight, expressed in g/mol, says what the molecule is. Vial mass, expressed in milligrams, says how much of it the label claims is in the container. The certificate's measured content says how much is actually there.

The first is a fact about chemistry and cannot vary between lots. The second is a claim about a fill operation and can. Confusing them is how a "10 mg" vial and a "1419.5" figure end up in the same sentence as if they were describing the same thing. Why the fill number needs its own measurement is covered in purity vs fill accuracy.

Two conventions account for most small discrepancies. Average molecular weight uses the natural isotopic abundance of each element; monoisotopic mass uses the most abundant isotope of each. For a peptide of a few hundred to a few thousand daltons the two differ by a small but visible amount, and a certificate reporting one against a listing quoting the other will look like a mismatch when it is not.

The second is salt form. Peptides commonly ship as acetate salts, and the counterion adds mass. A good certificate states whether its figures are net peptide or salt-inclusive. A discrepancy of a few percent between two sources is usually one of these two conventions; a discrepancy of hundreds of daltons is not.

Available at Eppix Labs

Buy Epitalon Canada | Telomerase Peptide 10mg

10mg

Every batch tested by an independent laboratory, with the certificate published before sale.

From $40.00 CADIn stock