COA Understanding¶
TL;DR¶
A Certificate of Analysis (COA) documents test results against specification limits. Key sections include HPLC purity, LC-MS identity confirmation, peptide content, water content, and residual solvents.
What is a COA?¶
A Certificate of Analysis (COA) is a document issued by the manufacturer confirming that a product meets specified quality standards.
Key Sections¶
1. Product Information¶
- Product name
- Batch/lot number
- Molecular formula and weight
- Sequence (for peptides)
- Quantity and packaging
2. Test Results Table¶
| Test | Specification | Result | Method |
|---|---|---|---|
| Appearance | White powder | Conforms | Visual |
| Purity (HPLC) | ≥98% | 99.12% | RP-HPLC |
| LC-MS | Consistent with MW | 1234.56 Da | LC-MS |
| Peptide Content | ≥85% | 87.3% | KF + GC |
| Water | ≤5% | 2.1% | Karl Fischer |
| Residual Solvents | ≤0.5% | 0.08% | GC |
| Endotoxin | ≤10 EU/mg | <1 EU/mg | LAL |
| Amino Acid Analysis | Matches theoretical | Conforms | AAA |
3. Analytical Documentation¶
- HPLC chromatogram
- LC-MS spectrum
- Storage and handling conditions
- Retest/expiry date
- Authorized signature
What Red Flags Indicate COA Problems?¶
| Flag | What It Means |
|---|---|
| No LC-MS data | Identity not confirmed |
| No HPLC chromatogram | Can't verify purity |
| "≥95%" with no spectrum | Low confidence |
| No batch number | Untraceable |
| No retest date | Stability not established |
Research vs. GMP COA¶
| Feature | Research COA | GMP COA |
|---|---|---|
| Full analytical data | Typically | Always |
| Signed by QA | Not always | Yes |
| Stability data | Limited | Required |
| Regulatory acceptance | Limited | Full |
- How to Read a Certificate of Analysis — See the section for detailed parameters and specifications.
- What Red Flags Indicate COA Problems? — See the section for detailed parameters and specifications.
- Research vs. GMP COA — Review the section above for key parameters, methods, and quality criteria.
🔗 Related: HPLC Analysis | LC-MS Testing | Purity Analysis | Download Sample COA & Tech Sheets
Key Takeaways¶
- What is a COA? — See the section above for detailed parameters and specifications.
- Key Sections — Review the section above for key parameters, methods, and quality criteria.
- What Red Flags Indicate COA Problems? — See the section above for detailed parameters and specifications.
- Research vs. GMP COA — Review the section above for key parameters, methods, and quality criteria.