Verified — all release criteria met
released
Certificate of analysis
SS-31
Lot CP-SS31-2604B · 50 mg
99.35 %
HPLC purity
Spec ≥ 98.0 %
91.6 %
Net peptide content
By amino acid analysis
< 0.19
Endotoxin (EU/mg)
Spec < 5.0 EU/mg
Provenance
- Testing laboratory
- Janoshik Analytical
- Accreditation
- ISO/IEC 17025:2017
- Country of synthesis
- United States
- Manufactured
- Apr 21, 2026
- Release tested
- Apr 30, 2026 (5 months ago)
- Retest date
- Apr 20, 2028
- CAS number
- 736992-21-5
- Molecular formula
- C32H49N9O5
- Theoretical mass
- 639.80 Da
- Observed mass (LC-MS)
- 639.79 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 %) | ≥ 98.0 % | 99.35 % | Pass |
| LC-MS (ESI+) | Identity — observed mass | 639.80 ± 1.0 Da | 639.79 Da | Pass |
| Amino acid analysis | Net peptide content | ≥ 80.0 % | 91.6 % | Pass |
| Karl Fischer | Water content | ≤ 8.0 % | 1.60 % | Pass |
| Ion chromatography | Residual TFA | ≤ 1.0 % | 0.15 % | Pass |
| LAL kinetic chromogenic | Bacterial endotoxin | < 5.0 EU/mg | < 0.19 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 |
Sequence
H-D-Arg-Dmt-Lys-Phe-NH2
Handling for this lot
- Appearance
- White lyophilised powder
- Storage
- -20 °C lyophilised; stable at 2–8 °C reconstituted for 30 days
- Reconstitution
- Straightforward. The 2,6-dimethyltyrosine content is confirmed by mass on the certificate — check it, because substitution with plain tyrosine is the common shortcut.
Other lots of SS-31
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.