How to Read a Peptide Certificate of Analysis
A practical document review guide for research peptide CoAs: match the batch, identify the methods, interpret results, and ask about missing information.
Read the guideLaboratory documentation guides
Peptide Research Resources
How to review a peptide Certificate of Analysis, and what purity, identity and content measurements each establish. Guides linked to primary sources.
These guides focus on evaluating analytical information for in vitro laboratory research. They do not provide dosing, administration, or clinical advice. Primary references are linked within each article so you can inspect the underlying methods and limitations.
Net Peptide Content: What Is Actually in the Vial
A lyophilised vial is not pure peptide by weight. Net peptide content, counter-ion and water mass, and why a purity percentage is not an amount.
Read the guideWhy Peptide Purity Is Reported in Several Different Ways
No single number means purity. Compare mass balance, quantitative NMR, amino acid analysis and chromatographic reporting, and what each one assumes.
Read the guideWhat Mass Spectrometry Can and Cannot Confirm About a Peptide
A matching mass is evidence, not proof. What mass spectrometry establishes about peptide identity, why methods are combined, and what to ask for.
Read the guideHow Stable Is a Lyophilised Peptide in Storage?
Freeze-drying slows change but does not stop it. What residual moisture and storage temperature do to a dried peptide, and what a CoA leaves out.
Read the guidePeptide Purity, Identity & Content Explained
Understand why peptide purity, identity, and content are different measurements, and how to review chromatography and mass spectrometry results for research.
Read the guideLooking for a product’s analytical records?
Use the quality and CoA request guide for the information to include when contacting support. For product specifications, sizes, and availability, visit the research compound catalog.
Sources and corrections
These educational guides are published by Savage Labs and distinguish scientific references from our suggested document review workflow. They do not represent an independent audit or certification of our products. If you identify a factual error or a source that needs updating, contact us with the article title and relevant passage.