This profile is a documentation-focused reference for Selank as a research material. It sets out the molecule's identity, how each lot is characterized analytically, the documentation supplied, and the storage and handling considerations a laboratory typically records. It is written for evaluating a material on paper — not as a description of any use, effect, or application, and it makes no such claims.
For current presentations and lot-specific values, see the Selank product page. This article provides the analytical and documentation context behind those figures.
Molecular Identity and Structure
Selank is a synthetic heptapeptide — a seven-residue sequence based on the endogenous peptide tuftsin, extended with additional residues that improve its stability as a defined molecule. Because it is produced synthetically rather than isolated, the sequence can be reproduced consistently and compared lot to lot.
It is catalogued under CAS registry number 129954-34-3, with the molecular formula C33H57N11O9 and a reported mass of approximately 751.9 Da. It is part of the Cognitive Research category in the Prototides catalog.
Specifications at a Glance
The following reference values describe the material as characterized. Lot-specific figures are always those printed on the accompanying Certificate of Analysis, which takes precedence over any general reference.
| Attribute | Reference value |
|---|---|
| CAS number | 129954-34-3 |
| Molecular formula | C33H57N11O9 |
| Reported mass | ~751.9 Da |
| Sequence length | 7 residues (heptapeptide) |
| Physical form | White lyophilized powder |
| Identity method | LC-MS |
| Purity method | RP-HPLC (area %) |
| Storage | -20 °C, protected from light |
| Classification | Research use only |
Analytical Characterization
Two complementary, orthogonal methods characterize each lot.
Purity — reverse-phase HPLC
Reverse-phase HPLC resolves the target peptide from synthesis-related impurities and reports purity as an area-percent value for the tested sample under the stated method.
Identity — LC-MS
LC-MS confirms the material by measuring its molecular mass and comparing it to the theoretical value for the seven-residue sequence. The distinction between purity and identity is explained in how identity and purity are verified.
Documentation and Lot Traceability
Each lot is supplied with a Certificate of Analysis recording purity, mass confirmation, and release date (see the guide to Certificates of Analysis), the supporting RP-HPLC purity report, and an independent third-party analytical report. A unique lot identifier ties these records to the physical material.
Storage and Handling Considerations
Selank is stored as a lyophilized powder at -20 °C, protected from light. The combination of basic and acidic residues in the heptapeptide makes it readily soluble in neutral aqueous solvents, so reconstitution is typically rapid. Reconstituted solutions are commonly divided into aliquots and kept cold to reduce freeze–thaw cycling; recording the reconstitution date alongside the lot identifier lets the age of a working solution be tracked. General laboratory practice is covered in laboratory handling protocols.
Research Context
Selank appears in the laboratory research literature as a synthetic peptide of interest. This profile intentionally does not describe, summarize, or imply any biological activity, effect, outcome, or application. Any research use is defined and bounded by the investigating laboratory's protocols, institutional SOPs, and applicable safety and regulatory requirements.
What This Profile Does and Does Not Establish
This is a documentation reference. It does not, on its own, establish any of the following:
- That the material is appropriate for a specific research workflow — suitability is a laboratory determination made against institutional SOPs.
- That every unit in a shipment is identical to a tested sample; analysis is performed on a sample, not on each container.
- Any biological effect, activity, or outcome — none is claimed or implied.
- Fitness for human or veterinary use, diagnosis, treatment, or consumption. Selank is supplied for laboratory research use only.
Key Takeaways
- Selank is a synthetic heptapeptide based on tuftsin (CAS 129954-34-3; ~751.9 Da), supplied as a lyophilized powder for research use only.
- Identity is confirmed by LC-MS; purity is reported by RP-HPLC — two distinct, complementary methods.
- Each lot carries a COA, an RP-HPLC purity report, and an independent third-party report tied by a lot identifier.
- Reported values describe a tested sample under stated methods — not suitability, uniformity, or any use.
