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About this material
TB-500 is a synthetic, N-acetylated heptapeptide (seven amino acids, sequence Ac-LKKTETQ) corresponding to fragment 17-23 of thymosin beta-4, with molecular formula C38H68N10O14. It is supplied as a lyophilized powder.
Specifications
- Form
- Lyophilized powder
- Appearance
- White to off-white lyophilized powder
- Purity / assay
- 99.95% (HPLC / MS)
- Molecular formula
- C38H68N10O14
- Molecular weight
- 889.0 Da
- CAS number
- 885340-08-9
- Amino-acid sequence
- Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln (Ac-LKKTETQ)
- Also known as
- Ac-LKKTETQ, Thymosin beta-4 fragment (17-23), TB500, TB-500 acetate, Acetyl-Leu-Lys-Lys-Thr-Glu-Thr-Gln-OH
- Test methods
- HPLC · MS · LAL
- Reconstitution
- In a suitable sterile solvent, per your protocol
- Presentation
- Sealed single research vial
- Storage
- Store lyophilized at -20°C; follow your laboratory’s own protocol.
- Current lot
- TB5-2406A
Certificate of Analysis
TB-500, third-party tested, per lot
LotTB5-2406A
Sample certificate. This is a representative placeholder. The signed Certificate of Analysis for this lot is issued by our research laboratory and will replace this record.
Assay purity · this lot
Illustrative99.95%
Representative trend, illustrative, not measured lot data
Result vs specification
97%Spec >= 98.0% · result 99.95%100%
- Testing lab
- Virberg
- Accreditation
- Pending
- Manufactured
- May 22, 2026
- Released
- June 10, 2026
- Retest by
- June 10, 2028
- Storage
- Store lyophilized at -20°C; follow your laboratory’s own protocol.
Purity by RP-HPLC · chromatogram
IllustrativeRetention time →Representative trace · not measured data
| Test | Method | Specification | Result |
|---|---|---|---|
| Appearance | Visual | Conforms to description | White to off-white lyophilized powder |
| Identity | Mass Spectrometry | Conforms to reference | Conforms |
| Purity | RP-HPLC | ≥ 98.0% | 99.95% |
| Molecular Mass | ESI-MS | Conforms to theoretical | Conforms |
| Water Content | Karl Fischer | ≤ 6.0% | 3.5% |
| Endotoxin | LAL (kinetic) | < 0.5 EU/mg | Pass (< 0.1 EU/mg) |
Appearance
- Method
- Visual
- Spec
- Conforms to description
- Result
- White to off-white lyophilized powder
Identity
- Method
- Mass Spectrometry
- Spec
- Conforms to reference
- Result
- Conforms
Purity
- Method
- RP-HPLC
- Spec
- ≥ 98.0%
- Result
- 99.95%
Molecular Mass
- Method
- ESI-MS
- Spec
- Conforms to theoretical
- Result
- Conforms
Water Content
- Method
- Karl Fischer
- Spec
- ≤ 6.0%
- Result
- 3.5%
Endotoxin
- Method
- LAL (kinetic)
- Spec
- < 0.5 EU/mg
- Result
- Pass (< 0.1 EU/mg)
Each lot is tested by an independent third-party laboratory. Results above correspond to lot TB5-2406A.
Download COA (PDF)Handling & storage
Supplied as a lyophilized powder. Typically soluble in water and in aqueous buffers; reconstitute in the solvent and to the concentration specified by your own protocol. Store the lyophilized powder at -20°C and protect from light and moisture; aliquot reconstituted material to avoid repeated freeze-thaw cycles and store per your protocol. Allow sealed vials to equilibrate to room temperature before opening to minimize condensation. Refer to the lot-specific Certificate of Analysis for purity and identity data. Any downstream handling is performed by the buyer according to their own laboratory protocol and applicable safety practice.
Documentation & traceability
Per-lot Certificate of Analysis
The COA for this lot is published on this page, no email gate.
Lot number matches the certificate
When you receive an order, the lot printed on the vial will match the COA published here.
Independently verified
Identity, purity, mass, and endotoxin are tested by a third-party laboratory.
Tracked, protected shipping
Ships discreetly with tracking, cold-packed where the compound requires it.
- Third-party lab tested
- Per-lot COA
- Identity + purity verified
- Research-use attested
- Discreet shipping
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