TB-500 10mg
Laboratory and analytical research only. Not for human consumption. 18+.
- Available to order
- Free UK tracked delivery
- Find product documents
Paid orders before 3pm UK time normally dispatch the same working day. Later orders dispatch the next working day. Excludes UK public holidays.
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Specification and laboratory information
✓ Verified peptide quality
✓ ≥99% purity by HPLC
✓ Current test certificate available
✓ Held in UK stock
✓ Free Royal Mail 24 Tracked delivery
✓ Orders before 3pm dispatched the same working day
Read this before you order TB-500 from anyone. "TB-500" is used commercially for two different molecules: the short acetylated fragment, and full-length thymosin β-4. They differ in mass by more than five times, and the analytical literature that applies to one does not apply to the other.
What we supply is the fragment: N-acetyl-Leu-Lys-Lys-Thr-Glu-Thr-Gln — seven residues corresponding to positions 17–23 of thymosin β-4, capped with an acetyl group at the N-terminus. It contains no cysteine, so there is no disulfide bond to preserve.
Chemical identity
| Compound | TB-500 (acetylated Tβ4 17–23 fragment) |
| CAS number | 885340-08-9 |
| Molecular formula | C₃₈H₆₈N₁₀O₁₄ |
| Molecular weight | 889.01 g/mol |
| Residue count | 7 (N-terminally acetylated) |
| Sequence | Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln |
| One-letter | Ac-LKKTETQ |
| PubChem CID | 62707662 |
| UNII | QHK6Z47GTG |
| Also indexed as | Ac-LKKTETQ, TB500 fragment, thymosin β-4 (17–23) |
| Not | Full-length thymosin β-4 (43 residues, C₂₁₂H₃₅₀N₅₆O₇₈S, ~4963 g/mol, PubChem CID 45382195) |
Product specification
| Nominal fill | 10mg |
| Purity | ≥99% by HPLC |
| Identity confirmation | Mass spectrometry |
| Physical form | Lyophilised powder |
| Appearance | White to off-white |
| Documentation | Lot-specific certificate of analysis |
Storage and handling
Store sealed at −20°C, away from moisture and light. The peptide is highly water-soluble. Equilibrate to room temperature before opening. Refer to the lot COA for batch-specific stability data.
Documentation
Lot-specific COA with every order, covering HPLC purity and MS identity confirmation. Because of the fragment/full-protein ambiguity described above, we'd encourage you to check the mass on the certificate against the 889.01 g/mol figure — that's the fastest way to confirm which entity you've been sent, by us or by anyone.
Supply and despatch
UK stock. Same-day despatch on orders before 3pm, Royal Mail 24 Tracked.
FAQ
Is TB-500 the same as thymosin beta-4? No. TB-500 as a defined chemical entity (CAS 885340-08-9) is a 7-residue acetylated fragment of around 889 g/mol. Full-length thymosin β-4 is a separate 43-residue protein of around 4963 g/mol. Some suppliers use the name for either — always check the mass on the COA.
What is the CAS number for TB-500? 885340-08-9, for the acetylated heptapeptide.
What is the sequence of TB-500? Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln (Ac-LKKTETQ), the actin-binding motif region of thymosin β-4.
How do I verify what I've received? Compare the mass spectrometry figure on your lot COA against 889.01 g/mol. A result near 4963 indicates full-length protein, not the fragment.
