Verification methodology
A paper trail for every vial.
Pure Peptide Institution publishes a Certificate of Analysis (COA) for every lot in our catalogue. Each batch passes three independent verification stages before being released for shipping.
HPLC Purity
High-Performance Liquid Chromatography quantifies each peptide's actual purity. We require ≥99% peak area for release. Chromatograms are attached to every COA.
Mass Spectrometry
MS confirms the molecular weight of the peptide matches the expected sequence — proving identity, not just purity. Results are referenced against the parent compound.
Endotoxin & Sterility
USP <85> bacterial endotoxin testing on injectable-grade lots. Visual particulate inspection, vial seal integrity, and lyophilization quality control.
How to read a COA
What's on the certificate
- Product & Lot
- Peptide name, sequence, lot number, and manufacture date.
- Purity Result
- HPLC peak area percentage, method parameters, and chromatogram image.
- Identity Result
- Mass spectrometry confirmation against theoretical mass.
- Appearance
- Visual properties of the lyophilized powder before vialing.
- Solubility
- Recommended diluent and reconstitution notes.
- Storage
- Pre- and post-reconstitution stability conditions.
- Endotoxin (when applicable)
- EU/mg threshold per USP <85>.
- Analyst signature
- Lab personnel and release date.
Lot-level traceability.
Every order ships with its lot-specific COA. Need a copy of a previous batch? Email your order ID and we'll send the PDF within 24 hours.