Lab tools

Peptide identity index

The peptide identity index tells you whether two names used for research peptides refer to the same molecule. Look up a catalog name, a CAS number, or an alias. Compare a second name when a vial, a paper, or a COA uses a different label.

Mass values computed from sequence are for checking an HPLC-MS report. This page does not calculate reconstitution volumes or human doses. Pair it with a lot-linked Certificate of Analysis and the 12-point COA audit.

Compound A

Adamax

2920938-90-3

Compound B

Semax

80714-61-0

Observed mass from a COA

Not the same molecule

Adamax is N-acetyl Semax amidate. Extra caps on both termini.

Peptide

Adamax

View specs

CAS: 2920938-90-3
Formula: C37H54N12O10
Catalog mass: 826.91 Da
Sequence avg: 854.98 Da
Monoisotopic: 854.3745 Da
Sequence: Ac-Met-Glu-His-Phe-Pro-Gly-Pro-NH2 (N-acetyl Semax amidate analogue)

Sequence average (854.98 Da) differs from the catalog mass (826.91 Da). Read the lot COA for the figure that lot used.

Expected ions

[M+H]+

855.3818

[M+2H]2+

428.1945

[M+3H]3+

285.7988

COA documents PubChem CAS search

Often confused with

Semax

Peptide

Semax

View specs

CAS: 80714-61-0
Formula: C35H52N12O9
Catalog mass: 813.93 Da
Sequence avg: 813.93 Da
Monoisotopic: 813.3480 Da
Sequence: Met-Glu-His-Phe-Pro-Gly-Pro

Expected ions

[M+H]+

814.3553

[M+2H]2+

407.6813

[M+3H]3+

272.1233

Presentations

Nasal spray

COA documents PubChem CID 9811102

Often confused with

How the index decides

Catalog CAS, formula, and sequence come from Tetrava lot identity tables. Monoisotopic mass and expected ions are calculated only when the sequence parses as standard residues plus common caps (acetyl, amide, Aib, Nle, pGlu). Heavily modified GLP-1 analogs stay as catalog text.

TB-500 is the main trap. Supplier tables often reuse the CAS and 4,963 Da mass of full-length thymosin beta-4 on a vial whose sequence is Ac-LKKTETQ. This index splits those identities on purpose.

Research use only. Not for human or veterinary consumption.