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HPLC vs LC-MS: What Peptide COAs Actually Prove

Understand how HPLC, Mass Spec, and LC-MS answer different peptide COA questions so research batches can be evaluated beyond a single purity number.

Jul 8, 2026
COA Literacy
HPLC
LC-MS
A clean peptide COA should answer two different questions: how pure does the batch appear under the method, and does the main material match the identity on the label?

Research Use Only
BetterBio Synthesis materials are sold for Research Use Only (RUO). They are not intended for human consumption, clinical use, diagnosis, treatment, prevention, or cure of any disease. This article is educational content about analytical testing and research documentation. It is not medical advice, dosing guidance, or a recommendation for human use. Not evaluated by the FDA. Must be 21+.
Quick Read: Purity vs Identity
HPLC helps estimate chromatographic purity under a specific method. Mass Spec helps confirm that the main material has the expected molecular signature.
LC-MS brings those signals together, making it more useful for evaluating peptide COAs than a single purity number by itself.