Can mass spec alone verify a peptide sequence?

Mass spec confirms molecular weight or fragmentation evidence, but molecular weight alone is not complete sequence verification.

Should HPLC chromatograms be reviewed before purchase?

For reference-standard or method-development work, yes. The chromatogram helps a lab judge whether the lot fits its analytical use case.

HPLC / MS verification

HPLC and MS peptide verification for research-lot review

HPLC and MS answer different questions. HPLC helps describe purity and impurity behavior. MS confirms mass identity. A strong review uses both without pretending either one is a complete sequence proof alone.

Review sample COA

Analytical proof

HPLC purity and trace interpretation

Analytical proof

MS identity and mass confirmation

Analytical proof

Impurity-profile review

Analytical proof

Orthogonal evidence discussion when sequence proof matters

What each method contributes

A lab needs to know what a method can and cannot prove. Lyochem's buyer-facing language separates purity, identity, and sequence-sensitive questions.

HPLC: main peak, minor peaks, shoulders, retention behavior
MS: mass identity and adduct interpretation
MS/MS or sequence evidence: residue-order confidence when needed
Method notes: column, gradient, wavelength, and sample preparation context

When more evidence is needed

For high-risk method development, impurity standards, or sequence-sensitive assays, buyers should ask whether additional orthogonal evidence is appropriate.

Isobaric or near-isobaric risk
Modified or labeled sequence
Impurity assignment
Lot-to-lot fingerprint comparison