Every lot tested. Every result published.
A peptide reference material is only as useful as its documentation. We test every lot through an independent ISO/IEC 17025-accredited laboratory before it goes on sale, and we publish the full results.
What we test
| Test | Method | Release spec |
|---|---|---|
| Purity | Reverse-phase HPLC (UV 214 nm) | ≥ 98% |
| Identity | ESI or MALDI-TOF mass spectrometry | Within ± 1 Da of theoretical mass |
| Net peptide content | Nitrogen or amino acid analysis | Reported per lot |
| Counter-ion content | Ion chromatography | Reported per lot |
| Water content | Karl Fischer | Reported per lot |
| Endotoxin (selected products) | LAL assay | Reported per lot |
Find a COA
Every vial carries a lot number that starts with “NV” followed by the catalog number, for example NV1014-2611A. COAs for current lots are on each product page, and every COA for lots you’ve bought is in your account under Orders.
What’s on every COA
Product name and catalog number, lot number, manufacture and retest dates, the testing laboratory’s name and accreditation number, each test with its method, result and specification, the analyst’s signature, and links to the raw chromatogram and spectrum.
Storage and stability
Lyophilized peptides are stable for at least 24 months at −20 °C in sealed vials, unless the COA states otherwise. Each COA lists a retest date.
Out-of-spec policy
If a lot fails any release test, it is not sold. If you find a discrepancy in a lot you received, contact us with your lot number and we’ll investigate and replace or refund it.
Testing confirms chemical identity and purity for research purposes only. It does not make any product suitable or safe for human or animal use.