Selank 5mg
£16.99 per vial · Peptides · Research use only
About Selank 5mg
Selank 5mg is a synthetic peptide research material, supplied as lyophilised powder in a single vial for in-vitro laboratory research.
Product specifications
- Compound
- Selank
- Declared content
- 5mg per vial
- Format
- Lyophilised powder
Batch documentation
The current published lot is IP-SELA5-001. The batch record from Janoshik Analytical (CZ), dated 24 August 2026, lists reported purity of 99.026% (RP-HPLC) and measured content of 5.27 mg/vial.
View the certificate of analysis →
Intended use
For in-vitro laboratory research only. Not for human or veterinary use.
Technical notes and further reading
- CAS number
- 129954-34-3
- Molecular formula
- C33H57N11O9
- Molecular weight
- 751.9 g/mol
- Sequence
- TKPRPGP (tuftsin analogue)
Specification
| SKU | SK5 |
|---|---|
| Compound | Selank |
| Price | £16.99 per vial |
| Format | 5mg per vial |
| Availability | In stock |
| CAS number | 129954-34-3 |
| Molecular formula | C33H57N11O9 |
| Molecular weight | 751.9 g/mol |
| Sequence | TKPRPGP (tuftsin analogue) |
| Published batch / lot | IP-SELA5-001 |
| Reported purity | 99.026% (RP-HPLC) |
| Measured content | 5.27 mg/vial |
| Identity status | LC-MS identity result not published |
| Tested by | Janoshik Analytical (CZ) |
| Report date | 2026-08-24 |
| Storage | Lyophilised: −20 °C, protect from light |
| Certificate of analysis | Published for lot IP-SELA5-001 — download it from this page, or request a copy |
| Intended use | In-vitro laboratory research only |
Buying Selank 5mg for UK laboratory research
Selank is supplied here in a 5mg lyophilised research vial. If comparing Selank and Semax listings, treat them as different materials and review each product's own documentation. Match the lot number on the supplied vial with the available report, and check any dispatch delay before ordering. The price shown applies to this 5mg format for in-vitro laboratory work.
- Semax 5mg — Compare the current price, availability and batch record.
What does the research on Selank investigate?
Selank is a synthetic seven-residue peptide derived from tuftsin, a naturally occurring tetrapeptide, extended at the C-terminal end with the same proline-glycine-proline tail used elsewhere in this catalogue. The tuftsin portion carries a lysine and an arginine, which makes the molecule strongly basic and, in solution, noticeably hydrophilic - a property that shapes both how it behaves in an assay and how it behaves on a column. That basicity means it retains poorly on a standard reversed-phase method and is more comfortably handled by cation exchange, which is worth knowing before concluding that a short retention time indicates a problem with the material. As with other short peptides the main handling concern is the arginine-rich backbone's sensitivity to pH extremes, and the practical work of characterising it is a question of picking a method that suits a very polar chain. This page describes the material and its documentation only.
Who can buy Selank?
Selank is supplied strictly as a research chemical for in-vitro laboratory research. Products are sold exclusively to qualified researchers and licensed laboratories.
At checkout the buyer confirms that they are 18 or over, are buying in the course of research, and are responsible for handling, storing and disposing of the material in line with their laboratory's procedures. Selank is not for human or veterinary use.
We only answer questions about specifications, documentation and orders.
How are identity and quality assured?
Each released lot is tested and the result is published, rather than the material being described as high purity on the strength of a supplier's word. Purity is measured by reversed-phase HPLC at an independent laboratory. The laboratory used for every lot published so far is Janoshik Analytical, in the Czech Republic, and the result is stated alongside the measured content against label so the two can be read together.
The report carries the lot number printed on the vial, which is the part that matters. A certificate showing a result without a lot number cannot be tied to the vial in front of you, and a certificate for a different lot tells you nothing about yours. Matching the printed number on the label to the number on the report is a five second check and it is the whole point of publishing both.
Identity confirmation by mass spectrometry is a separate test and is ordered as an add-on, so the figures published here come from RP-HPLC purity testing unless a report says otherwise. Where no report is published for a listing yet, the documentation held for the lot being shipped can be requested before you order. We would rather send you what exists than let you assume a certificate is available when it is not.
Synthesis and supply
Peptide material is built by solid-phase synthesis, purified by preparative HPLC, then lyophilised. Lyophilisation freezes the solution and removes the solvent under vacuum, which is why the vial arrives holding a cake or powder rather than a liquid and why a solvent has to be added before the material can be worked with. Removing water also removes the main route by which a peptide degrades in storage, which is the reason the format is used.
Sequence length and modification are what make batches differ in difficulty. Every coupling step is an opportunity for a truncated or deleted by-product, and a heavily modified or long chain presents more of them, which is why the purity trace rather than the headline figure is what a certificate is read for. Vials are filled and labelled with the lot number, and the lot number is what the report and the verification lookup resolve against.
External resources for researchers
These are the public reference sources we use when checking the identity of Selank, and the ones worth going to before relying on anything stated on a product page, including this one.
- PubChem — Compound records, computed properties, depositor-supplied identity data.
- CAS Common Chemistry — CAS Registry lookups where a registry number is known.
- ChEBI — Curated chemical ontology entries with cross-references.
- Europe PMC — Primary literature search by compound name, sequence or registry number.
- Certificate hub — Reports published for the lots released so far.
Frequently asked questions
Is Selank supplied for human or veterinary use?
No. Selank is supplied as a lyophilised powder in a sealed vial and is supplied strictly as a research chemical for in-vitro laboratory research. Products are sold exclusively to qualified researchers and licensed laboratories, and buyers confirm they are 18 or over and purchasing in the course of research. We only answer questions about specifications, documentation and orders.
How is the purity figure measured, and what does it actually tell me?
Purity is measured by reversed-phase HPLC at an independent laboratory, and the result is published with the method conditions rather than as a bare percentage. The figure is the proportion of the UV-absorbing material in the chromatogram that elutes as the target peak. It describes the sample as analysed; it is not a statement about what the material is for. A high figure alongside a clean chromatogram is the useful combination, which is why the report is worth reading rather than the headline number alone.
What documentation comes with a batch?
Each released lot carries a number printed on the vial label and a report stating purity by RP-HPLC, measured content against label, and the testing laboratory. Reports published so far are listed on this page and collected on the certificate hub, and each carries a lot number that can be checked against the vial in front of you. Where a report is not yet published for a listing, ask before ordering and we will send the documentation that exists for the lot being shipped.
How should Selank be stored?
In the form supplied, as a lyophilised powder, the material is stable kept cold, dry and dark. For powder, that means a freezer at around minus 20 degrees Celsius, desiccated, with the vial sealed and shielded from light, which is how it should stay until you are ready to work with it. Bringing a vial to room temperature before opening avoids condensation on the contents. Once in solution the material is less stable than the powder and should be kept cold and used within a short working window. Choosing a solvent and storage conditions for your own work is your call, not ours.
Do I need bacteriostatic water to prepare it?
A lyophilised powder needs a solvent added before it can be worked with. Bacteriostatic water, which is water with 0.9% benzyl alcohol, is the common choice because the preservative extends the working life of the solution once the vial has been opened, and we supply it in 3ml and 10ml vials. It is not the only option: where a method cannot tolerate benzyl alcohol, use the solvent the method specifies. The choice affects the sample, so it belongs to the researcher.
How and when is an order shipped?
Orders are dispatched from the United Kingdom. An order placed before 4pm on a working day is collected the same day; weekends and bank holidays roll forward to the next working day. UK orders go by tracked DPD next-day delivery, free on orders over 14 pounds and 4.99 pounds below that. Tracking is sent when the parcel is collected, so the first scan is usually visible the same evening.
What is tuftsin, and what does deriving from it mean?
Tuftsin is a naturally occurring tetrapeptide, and Selank is a synthetic analogue of it with an added proline-glycine-proline tail at the C-terminal end. Being an analogue means the sequence has been altered rather than extracted: the relationship to the parent peptide is a structural one, and the literature treats the two as distinct molecules. The added tail is not present in tuftsin.
Why does Selank elute early on a reversed-phase column?
Because it is hydrophilic. Reversed-phase chromatography retains molecules in proportion to how hydrophobic they are, and a chain built from lysine, arginine, threonine and proline is markedly polar, so it interacts weakly with the stationary phase and leaves the column quickly. A short retention time is therefore the expected result rather than a sign of a failed synthesis. Method development for a compound like this usually means reaching for ion exchange or adding an ion-pairing reagent instead of lengthening the gradient.
How does Selank differ from Semax, given they share a tail?
They share the C-terminal proline-glycine-proline stabilising tail but derive from different parent peptides and carry different core sequences, so their residue composition, mass and retention behaviour are all different. Selank's core is basic - it contains lysine and arginine - while Semax's is built from the ACTH(4-10) sequence. Sharing a modification is a common design shortcut; it does not make the two compounds interchangeable analytically.
What is the main handling concern with a very basic peptide?
Charge. A chain carrying several basic residues is sensitive to the pH and ionic strength of whatever it is dissolved in, and those conditions determine which form is present in solution. Running a strongly basic peptide through a method designed for a neutral one tends to produce a broad or poorly resolved peak rather than a clean result. Establishing suitable solvent conditions is the researcher's call, and it is usually the first variable worth checking when a result looks wrong.
What storage conditions suit a very polar peptide?
The same as for any lyophilised peptide, and the polarity does not make it more demanding: keep it cold, dry and dark with the vial sealed, and let it reach room temperature before opening so condensation does not settle on the powder. The difference appears once it is in solution, where a strongly basic chain is more sensitive to the pH and ionic strength of the solvent than a neutral one.
Can a basic peptide stick to labware?
It can. A chain carrying several basic residues interacts with negatively charged surfaces, including some glass and certain plastics, and that interaction removes a fraction of the material from solution without leaving any visible sign. Where losses to surfaces matter, the usual responses are low-binding vessels, a higher ionic strength to screen the surface charge, and a carrier protein where the assay allows one. A result that reads low may be an adsorption effect rather than a problem with the material.
Documentation & batch verification
The current released lot is IP-SELA5-001, tested 2026-08-24 by Janoshik Analytical (CZ): RP-HPLC purity 99.026% (RP-HPLC), measured content 5.27 mg/vial, identity Purity confirmed (RP-HPLC). The full report for this lot is published and can be checked online — verify this batch. See the full record for lot IP-SELA5-001 or all published certificates of analysis.
Published batch records show the laboratory, report date, purity and measured content where reported. Check the certificate for the exact lot: an HPLC purity result does not establish LC-MS identity, sterility or suitability for human or animal use. Review the published batch record before ordering.
Order Selank 5mg online — UK dispatch · Request an invoice · Verify a batch
Research use only. Not for human or animal consumption.