HPLC vs MS vs net peptide content: a decision tree for research peptide CoAs
8 min read · Research use only
Written and reviewed by BluGen Research Team · Editorial standards
Three fields drive most peptide receiving decisions. Confusing them is how labs accept incomplete documentation. Use this decision tree before releasing a lot into inventory.
Start with lot linkage
If vial lot ≠ CoA lot, stop. No purity number fixes a chain-of-custody break.
Branch A — HPLC purity present?
Yes: record method wavelength/conditions if provided and archive the chromatogram when available.
No: quarantine. Area-percent purity is a baseline release field for synthetic peptides.
Branch B — MS identity present?
Yes: confirm observed mass matches the expected free acid/amide/acylated form for the SKU.
No: quarantine for identity risk even if HPLC looks excellent.
Branch C — Will you calculate concentration?
If yes, require net peptide content. Gross mass alone biases molarity.
If no (qualitative presence only), still prefer net peptide for future assay reuse.
Branch D — Release or escalate
Release only when lot linkage, HPLC, and MS clear your SOP. Escalate to the supplier when any required field is missing or inconsistent.
Frequently asked questions
Can high HPLC purity replace MS?
No. Purity and identity answer different questions.
Where should I learn CoA line items in more depth?
Read the CoA reading guide and the purity pillar article, then practice on a published lot in the CoA Library.
Citation
BluGen Research Peptides — HPLC vs MS vs net peptide content: a decision tree for research peptide CoAs. https://getblugen.com/research/hplc-ms-net-peptide-decision-tree/. Accessed 2026-07-21.
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