Short answer: HPLC and LC-MS are complementary: a chromatographic method can separate and quantify specified signals; mass spectrometry adds mass-related evidence for identity. Neither technique alone answers every release question.
What to establish
Ask what HPLC mode, detector, reference standard and integration criteria were used. A high main-peak area is not proof of sequence, potency or gravimetric content. Method specificity matters when related peptides can co-elute.
What to verify
For LC-MS, ask for the expected charge-state or mass interpretation and whether the result distinguishes the target from plausible alternatives. A matching mass is useful identity evidence but does not by itself establish every structural feature or impurity limit.
Decision and next step
Build a test plan from the purchase decision: identity, related substances, content, counterion and water may require different procedures. Request the laboratory’s method scope and reportable outputs before shipping a sample.
Practical request
Use the points above to request a defined product, sample or lot record. Ask the document issuer to explain any discrepancy; do not infer regulatory suitability from a catalog listing.
Related guides
Primary sources
Educational procurement guidance. Confirm the current rules for the exact material, market and intended use before purchase or use.
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