A certificate should answer more than 'what is the purity'.
A peptide COA review should confirm product identity, lot, test method, result, specification limit, approval and the report's relationship to the material being supplied.
COA review fields
Missing fields should become written questions, not assumptions.
| Field | What to check | Why it matters |
|---|---|---|
| Product | Name, code, grade and strength | Connects report to quotation |
| Lot | Batch identifier and production reference | Shows what the result belongs to |
| Method | HPLC, MS or other stated method | Defines what the result represents |
| Result | Measured value and units | Prevents bare-number comparisons |
| Specification | Acceptance range or limit | Shows pass/fail context |
| Approval | Date, reviewer and report version | Supports record control |
| Photo or insert | Whether the file includes sample image | Adds context but not proof on its own |
Questions to ask when two COAs look different.
- Are the materials and lots actually comparable?
- Are purity and content being used interchangeably?
- Are the methods and acceptance limits the same?
- Is the report representative or linked to the quoted lot?
What this route can and cannot confirm
Does HPLC purity equal peptide content?
No. Purity is commonly reported from a chromatographic area percentage, while content is a quantitative measure. Confirm the specification and method before comparing numbers.
Can one COA be used for later lots?
A report should be tied to the lot it covers. A representative certificate can explain format, but it does not automatically qualify another batch.
What if the COA has no specification limit?
Ask for the applicable specification and clarify what the result is being compared against. A result without a limit is incomplete for purchasing review.
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