- ≥99% by HPLC
- Lot-matched certificate of analysis
- Ships next business day, tracked
Testagen
Lys-Glu-Asp-Gly (KEDG) tetrapeptide used in reproductive-tissue research models
- FormLyophilized powder in a sealed glass vial
- Mol. weight447.44 g/mol
- Research areasReproductive tissue models, germ-cell and steroidogenic markers, gene expression, ageing
Overview
Testagen is a synthetic tetrapeptide with the sequence L-lysyl-L-glutamyl-L-aspartyl-glycine (Lys-Glu-Asp-Gly, or KEDG), supplied here as H-Lys-Glu-Asp-Gly-OH with free termini. It sits in the Khavinson short-peptide bioregulator series as the sequence associated with gonadal and reproductive tissue preparations, following the same design logic as the rest of the family: take a tissue-derived peptide extract, identify a short active sequence, and reproduce it synthetically so that experiments can be run on a defined molecule.
Its sequence is a one-residue extension of Vesugen (KED) with a terminal glycine. That relationship is useful in the laboratory, because it lets researchers ask whether adding a small, flexible residue at the C-terminus changes reported selectivity or activity while everything else about the molecule stays the same. Glycine's lack of a side chain makes it the least perturbing extension available, which is part of why the comparison is informative.
Published work involving KEDG has concentrated on testicular and gonadal tissue in rodent models, cell-culture systems examining steroidogenic and germ-cell markers, and comparisons against other members of the peptide series in the same assay. Our Testagen ships as a 20 mg lyophilized vial, HPLC purified to a ≥99% specification with a lot-matched certificate of analysis, and is offered strictly for laboratory research.
Specifications
Identity
- Molecular formula
- C17H29N5O9
- Molecular weight
- 447.44 g/mol
- Amino acid sequence
- H-Lys-Glu-Asp-Gly-OH (KEDG)
- Peptide class
- Khavinson short-peptide bioregulator (tetrapeptide)
Supply & purity
- Form
- Lyophilized powder in a sealed glass vial
- Purity
- ≥99% by HPLC; lot-matched COA available
- Available sizes
- 20 mg
- Solubility
- Bacteriostatic or sterile water; readily soluble in aqueous buffers
Handling & storage
- Storage (lyophilized)
- −20 °C, sealed and protected from light and moisture
- Storage (reconstituted)
- 2–8 °C, protected from light; use within the study window
Additional detail
- Tissue association
- Testicular and gonadal peptide preparations
- Research areas
- Reproductive tissue models, germ-cell and steroidogenic markers, gene expression, ageing
- Sequence relationship
- Vesugen (KED) plus a C-terminal glycine residue
Working out the concentration
The vial sizes above — 20 mg — describe a mass of material, not a strength. Choose a diluent volume, work it out with the reconstitution calculator, and you have the concentration for your own vial of Testagen plus the volume that carries any mass you want to withdraw.
For work specified in µM or nM rather than mg/mL, feed 447.44 g/mol and your volume into the peptide molarity calculator.
Certificate of analysis
Every lot of Testagen is released against a certificate of analysis: the batch-specific laboratory data for that lot, not a generic document for the compound. The lot number on the certificate matches the lot number printed on the label you receive — the vial label itself, where the product is vialled — so the record and the material it describes can always be reconciled.
Purity: ≥99% by HPLC — the specification for this listing. The figure for the lot you receive is the one reported on that lot’s certificate.
No lot certificate is on display on this page at the moment. That is a publishing state and not a testing one: lots are released and documented as described above whether or not the document is posted here, and we will send what exists for the lot in stock, or for a lot already on your bench, by its number.
Certificates are available on request before you order as well as after, with no account and no charge. Request the certificate for this listing, read the testing and documentation policy in full, or see how to read a peptide COA.
Questions about Testagen
What is Testagen?
Testagen is the synthetic tetrapeptide Lys-Glu-Asp-Gly (KEDG) from the Khavinson short-peptide bioregulator family, associated in that literature with gonadal tissue. It is supplied as a lyophilized research chemical for laboratory use only.
Is a COA provided?
Yes. Each lot is tested by HPLC against a ≥99% purity specification and a lot-matched certificate of analysis is available on request, listing the batch identifier, purity result, identity confirmation, and appearance.
Why is there no CAS number listed?
No widely recognised CAS registry entry is available for this sequence, so we leave the field blank rather than publish an unverified number. The amino acid sequence, formula, and molecular weight are listed instead and are confirmed on the lot COA.
How does it relate to Vesugen?
Testagen is the KED tripeptide of Vesugen extended by one glycine at the C-terminus. Because glycine has no side chain, the pair is often used to test whether simply lengthening the sequence changes the behaviour reported in a given assay.
How should it be stored?
Hold the unopened lyophilized vial at −20 °C, away from light and moisture. Once reconstituted, keep the solution at 2–8 °C for the study window, or freeze single-use aliquots to avoid repeated freeze-thaw cycles.
