Verified — all release criteria met
releasedCurrent lot
Certificate of analysis
PT-141
Lot CP-PT141-2607A · 10 mg
99.33 %
HPLC purity
Spec ≥ 99.0 %
85.3 %
Net peptide content
By amino acid analysis
< 0.43
Endotoxin (EU/mg)
Spec < 5.0 EU/mg
Provenance
- Testing laboratory
- Aurum Bioanalytics
- Accreditation
- ISO/IEC 17025:2017
- Country of synthesis
- United States
- Manufactured
- Jul 12, 2026
- Release tested
- Jul 21, 2026 (2 months ago)
- Retest date
- Jul 11, 2028
- CAS number
- 189691-06-3
- Molecular formula
- C50H68N14O10
- Theoretical mass
- 1025.16 Da
- Observed mass (LC-MS)
- 1025.10 Da (Δ 0.06 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 % | 99.33 % | Pass |
| LC-MS (ESI+) | Identity — observed mass | 1025.16 ± 1.0 Da | 1025.10 Da | Pass |
| Amino acid analysis | Net peptide content | ≥ 80.0 % | 85.3 % | Pass |
| Karl Fischer | Water content | ≤ 8.0 % | 4.27 % | Pass |
| Ion chromatography | Residual TFA | ≤ 1.0 % | 0.16 % | Pass |
| LAL kinetic chromogenic | Bacterial endotoxin | < 5.0 EU/mg | < 0.43 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 |
| RP-HPLC (orthogonal gradient) | Linear (uncyclised) content | ≤ 0.5 % | 0.03 % | Pass |
Sequence
Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH
Handling for this lot
- Appearance
- White to off-white lyophilised powder
- Storage
- -20 °C lyophilised, protected from light
- Reconstitution
- Standard handling. Confirm against the retention-time comparison on the certificate if you also hold Melanotan II stock.
Other lots of PT-141
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.