What Is Certificate of Analysis (COA)?
Category: Quality
A document from a testing laboratory confirming the purity, identity, and quality of a peptide product. Reputable vendors provide COAs for each batch, ideally from third-party labs.
Detailed Explanation
A Certificate of Analysis (COA) is an official document issued by a quality control laboratory that confirms the results of testing performed on a specific batch of product. For peptides, a COA typically includes HPLC purity results, mass spectrometry confirmation of molecular identity, endotoxin testing results, and sometimes amino acid analysis. The COA serves as proof that the product meets specified quality standards.
Practical Context
Always request a COA before purchasing peptides. A legitimate COA should include the batch or lot number matching your product, the date of testing, HPLC purity (look for 98%+ purity), mass spectrometry results confirming correct molecular weight, and the name of the testing laboratory. Third-party COAs (from independent labs rather than the manufacturer) are considered more reliable.
Frequently Asked Questions
What should I look for on a COA?
Key items include HPLC purity (98%+ is ideal), mass spectrometry confirmation, endotoxin levels, batch number, test date, and the name of the testing laboratory.
Should the COA come from a third-party lab?
Yes, third-party COAs are more trustworthy because the testing is done by an independent laboratory with no financial interest in the results.
Related Terms
- HPLC (High-Performance Liquid Chromatography) - The gold standard analytical method for measuring peptide purity. Separates components of a sample to determine what percentage is the desired peptide vs. impurities. Look for 98%+ purity.
- Mass Spectrometry (MS) - An analytical technique that identifies compounds by their molecular weight. Used alongside HPLC to confirm that a peptide is actually what the label claims.
- Endotoxin - A toxic substance released from bacterial cell walls. Endotoxin contamination in peptide products can cause fever, inflammation, and serious adverse reactions. Quality testing should check for endotoxin levels.