Verified — all release criteria met
released
Certificate of analysis
Tirzepatide
Lot CP-TIRZEPPA-2605B · 20 mg
99.09 %
HPLC purity
Spec ≥ 99.0 %
87.4 %
Net peptide content
By amino acid analysis
< 0.30
Endotoxin (EU/mg)
Spec < 5.0 EU/mg
Provenance
- Testing laboratory
- Colmaric Analyticals
- Accreditation
- ISO/IEC 17025:2017
- Country of synthesis
- United States
- Manufactured
- May 4, 2026
- Release tested
- May 13, 2026 (5 months ago)
- Retest date
- May 3, 2028
- CAS number
- 2023788-19-2
- Molecular formula
- C225H348N48O68
- Theoretical mass
- 4813.45 Da
- Observed mass (LC-MS)
- 4813.46 Da (Δ 0.01 Da)
Assay results
Every line the release panel ran for this lot, with the method, the acceptance criterion and the measured value — not a pass mark alone.
| Method | Parameter | Specification | Result | |
|---|---|---|---|---|
| RP-HPLC (UV 214 nm) | Purity (area %) | ≥ 99.0 % | 99.09 % | Pass |
| LC-MS (ESI+) | Identity — observed mass | 4813.45 ± 1.0 Da | 4813.46 Da | Pass |
| Amino acid analysis | Net peptide content | ≥ 80.0 % | 87.4 % | Pass |
| Karl Fischer | Water content | ≤ 8.0 % | 4.64 % | Pass |
| Ion chromatography | Residual TFA | ≤ 1.0 % | 0.07 % | Pass |
| LAL kinetic chromogenic | Bacterial endotoxin | < 5.0 EU/mg | < 0.30 EU/mg | Pass |
| USP <71> membrane filtration | Sterility | No growth | No growth | Pass |
| Visual / USP <790> | Appearance | White to off-white cake, free of visible particulates | Conforms | Pass |
Handling for this lot
- Appearance
- White lyophilised cake, low density
- Storage
- Lyophilised at -20 °C. Reconstituted at 2–8 °C, protected from light.
- Reconstitution
- Allow the vial to reach room temperature before adding diluent — cold glass promotes localised supersaturation and cloudy reconstitution.
Other lots of Tirzepatide
Compare batch to batch. Consistency across lots is a stronger signal than any single certificate.
Research use only. This certificate describes material supplied strictly for laboratory research. It is not a drug, food, cosmetic or medical device, has not been evaluated by the FDA, and is not intended for human or veterinary administration of any kind.