Research peptide data sheet
SS-31Research peptide · identity, purity & COA
SS-31 is a synthetic four-residue peptide built from alternating aromatic and basic amino acids, used in in-vitro mitochondrial research. Below: its identity data and the numbers from our current lot's certificate of analysis.
- HPLC purity
- 99.19%
- Net content vs label
- −0.7%
- Identity (LC-MS)
- Confirmed
SS-31 identity data
- Type
- Synthetic tetrapeptide
- Sequence
- D-Arg – Dmt – Lys – Phe – NH₂
- Molecular formula
- C32H49N9O5
- Molecular weight
- 639.8 g/mol
- CAS number
- 736992-21-5
- Form
- Lyophilized
- Appearance
- White powder
Formula, CAS number, form and appearance as printed on the lot's COA; molecular weight calculated from that formula. Dmt = 2′,6′-dimethyl-L-tyrosine; C-terminal amide.
Current lot: SGX-PEP-2026-0617-K16
HPLC purity 99.19%
Spec on the report: above 98%. LC-MS identity confirmed against the SS-31 reference standard.
Net content 9.93 mg measured vs 10 mg label (−0.7%), inside the 10 mg ± 10% spec.
- Lab
- SteriGenix Analytical
- Analyzed
- June 24, 2026
- Report
- RPT-2026-364550
- Sterility
- No growth
Verify it yourself: the report lists the lab's verification page, sterigenixanalytical.com/verify. Enter access code SGX-PEP-2026-0617-K16 (the lot number on your vial).
Laboratory storage
- Long termKeep the sealed lyophilized powder at −20 °C.
- Short term2–8 °C (refrigerated) for brief periods; avoid repeated freezing and thawing.
- Protect itAway from light and moisture; let the vial reach room temperature before opening.
Questions about SS-31
Is SS-31 a peptide?
Yes. It is a synthetic tetrapeptide (four residues) with an amidated C-terminus. One residue, Dmt, is a modified tyrosine, which is why its formula differs from a plain four-amino-acid chain.
What does the current lot's COA show?
LC-MS identity confirmed against the SS-31 reference standard, HPLC purity above the report's 98% spec, and net content inside the 10 mg ± 10% range. The exact numbers are in the lot panel above and in the PDF.
How do I read this COA?
Start with the lot number, then identity (LC-MS), purity (HPLC) and net content against their specs. Our step-by-step COA guide walks through a real report line by line.