DSIP 5mg
£16.99 per vial · Peptides · Research use only
About DSIP 5mg
DSIP 5mg is a synthetic peptide research material, supplied as lyophilised powder in a single vial for in-vitro laboratory research.
Product specifications
- Compound
- DSIP
- Declared content
- 5mg per vial
- Format
- Lyophilised powder
Batch documentation
The current published lot is IP-DSIP5-001. The batch record from Janoshik Analytical (CZ), dated 24 August 2026, lists reported purity of 99.203% (RP-HPLC) and measured content of 5.56 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
- 62568-57-4
- Molecular formula
- C35H48N10O15
- Molecular weight
- 848.8 g/mol
- Sequence
- WAGGDASGE
Specification
| SKU | DS5 |
|---|---|
| Compound | DSIP |
| Price | £16.99 per vial |
| Format | 5mg per vial |
| Availability | In stock |
| CAS number | 62568-57-4 |
| Molecular formula | C35H48N10O15 |
| Molecular weight | 848.8 g/mol |
| Sequence | WAGGDASGE |
| Published batch / lot | IP-DSIP5-001 |
| Reported purity | 99.203% (RP-HPLC) |
| Measured content | 5.56 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-DSIP5-001 — download it from this page, or request a copy |
| Intended use | In-vitro laboratory research only |
DSIP 5mg: UK peptide listing and batch checks
DSIP is listed as 5mg of lyophilised research material per vial. Compare offers using the same labelled quantity, and check the available report for the product and lot being supplied. A product name is not an analytical result: the documentation shows which measurements are available. Current UK price, ordering availability and any dispatch delay are shown on this page.
What does the research on DSIP investigate?
DSIP, or delta sleep-inducing peptide, is a nonapeptide first isolated from rabbit cerebral venous blood in the late 1970s, and its name records the finding that prompted its isolation rather than anything a supplier claims about it. What makes it interesting chemically is how much behaviour is packed into nine residues: an N-terminal tryptophan, an aspartate and a glutamate that between them give the chain a net negative charge at neutral pH, and glycine residues that keep the backbone flexible. That combination makes it one of the more polar peptides in this catalogue, which has consequences for both purification and analysis. The N-terminal tryptophan is the principal analytical liability, since it oxidises readily and an oxidised preparation differs from an intact one in mass and retention time. This page describes the material and its documentation only.
Who can buy DSIP?
DSIP 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. DSIP 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 DSIP, 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 DSIP supplied for human or veterinary use?
No. DSIP 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 DSIP 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.
Where does the name come from?
From the research context in which the peptide was first isolated in the late 1970s. It is a historical label attached to a nine-residue sequence, not a description of an established property or a claim made by this supplier. The sequence itself - tryptophan, alanine, glycine, glycine, aspartate, alanine, serine, glycine, glutamate - is what the compound actually is, and it is what a certificate verifies.
Why is the tryptophan a stability concern?
Tryptophan is the most readily oxidised of the standard amino acids, and when it sits at the N-terminal end of a short chain there is little to protect it. Oxidation adds sixteen daltons to the molecule, which shifts the observed mass and usually moves the peak earlier on a reversed-phase run. On a purity trace this appears as a second, closely related peak rather than as obvious degradation, so it is worth knowing what it looks like before deciding a batch is faulty.
Why does a nine-residue peptide behave differently to a longer one?
Short chains have fewer internal interactions to hold a folded shape, so they tend to be more exposed to solvent and to whatever else is in the buffer. For DSIP specifically, the two acidic residues give it a net negative charge in neutral solution, which affects how it interacts with surfaces and with chromatography media. The practical consequence is that a method optimised for a longer or more hydrophobic peptide will often need adjusting.
What should be verified on a certificate for a peptide this small?
Purity by RP-HPLC with the method conditions, measured content against label, and a mass figure that matches the expected value for the intact sequence. At this size a single oxidised residue is a measurable fraction of the total mass, so the mass result carries more diagnostic weight than it would for a large peptide where the same change would be a rounding error.
What storage conditions protect the N-terminal tryptophan?
Cold, dry, dark and sealed, with the vial allowed to reach room temperature before opening. Tryptophan oxidation needs oxygen, and the risk is greatest once the material is dissolved, so solutions are best prepared when they are needed. In the powder the residue is largely protected by the lyophilised form, which is one of the reasons the material is supplied that way.
Why does the sequence contain so many glycine residues?
Glycine has no side chain beyond a single hydrogen, so it adds almost nothing to the bulk of the chain and allows the backbone a wide range of shapes. Three of the nine residues are glycine, which makes the peptide markedly flexible in solution beside a chain of similar length built from larger residues. That flexibility has practical consequences for how the molecule interacts with surfaces and with chromatography media, and it is part of why a method developed for a stiffer peptide may need adjusting.
Documentation & batch verification
The current released lot is IP-DSIP5-001, tested 2026-08-24 by Janoshik Analytical (CZ): RP-HPLC purity 99.203% (RP-HPLC), measured content 5.56 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-DSIP5-001 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 DSIP 5mg online — UK dispatch · Request an invoice · Verify a batch
Research use only. Not for human or animal consumption.