Quality
What the certificate tells you.
Every lot we sell is produced in Guangzhou under the manufacturer's quality system and released with a certificate of analysis. Ask for the COA of the lot printed on your vial and we'll send it the same day.
Browse the catalogueRetention time (min) · RP-HPLC · 220 nm
What each lot’s certificate reports.
| Test | Method | Acceptance |
|---|---|---|
| Purity | Reverse-phase HPLC, UV detection at 214–220 nm | Main peak ≥ 99% of total area for peptides |
| Identity | Electrospray mass spectrometry (ESI-MS) | Observed mass within tolerance of the theoretical mass |
| Appearance | Visual inspection of the lyophilised cake | White to off-white powder, no discolouration |
| Fill | Gravimetric check on sampled vials | Within the stated amount per vial |
Reading a chromatogram.
The tall peak is the target peptide. Smaller peaks are related substances such as truncated sequences or oxidised forms. Purity is the main peak's share of the total peak area.
Storage on arrival.
Keep lyophilised vials sealed at −20 °C and away from light. Allow a vial to reach room temperature before opening to avoid condensation.