Glossary

Certificate of Analysis (CoA)

Documentation

Certificate of Analysis (CoA) — A document issued by a manufacturer or testing laboratory certifying the identity, purity, and quality of a specific batch of compound.

What Is a Certificate of Analysis?

A Certificate of Analysis (CoA) is a quality document that accompanies each batch of a manufactured peptide, reporting the results of all quality control tests performed on that specific lot. It is the primary tool researchers use to verify that a peptide meets specifications before beginning experiments. Every peptide sold by Peptera Research includes a batch-specific CoA.

What a CoA Should Include

Product identification: Peptide name, sequence, catalog number, lot/batch number
HPLC purity: Percentage purity with chromatogram showing peak shape and retention time
Mass spectrometry: Observed molecular weight vs. theoretical, confirming correct sequence
Appearance: Physical description (white powder, blue powder for copper peptides, etc.)
Net peptide content: Actual peptide mass vs. total powder weight (accounts for salt and moisture)
Solubility: Recommended solvent and expected behavior
Endotoxin testing: LAL test results for cell culture and in vivo grade materials

Red Flags on a CoA

Missing mass spectrometry data, purity below 95% without explanation, no lot number (indicating a generic rather than batch-specific document), or HPLC chromatograms showing multiple peaks of similar height all indicate potential quality issues that should be investigated before using the peptide.

How to Verify

Compare the reported molecular weight against the calculated value using the peptide's amino acid sequence. Check that the HPLC chromatogram shows a single dominant peak. Verify the lot number matches what is printed on the vial label. Request a new CoA if the document appears generic or lacks batch-specific data.

Frequently Asked Questions

What is Certificate of Analysis (CoA)?

A document issued by a manufacturer or testing laboratory certifying the identity, purity, and quality of a specific batch of compound.

Why is Certificate of Analysis (CoA) important in peptide research?

Certificate of Analysis (CoA) is a fundamental concept in documentation as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.

Authority Sources

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