Purity
✓ Endotoxin Cleared
Sample Summary
| Product | TB-500 |
|---|---|
| Compound | Thymosin beta-4 fragment; Ac-LKKTETQ active sequence (aa 17–23) |
| CAS Number | 107761-42-2 (Thymosin beta-4 active sequence) |
| Molecular Weight | 4963.48 Da |
| Batch / Lot | BH-260206 |
| Accession # | BH2602060001 |
| Test Date | February 6, 2026 |
| Appearance | White Lyophilised Powder |
| Identity Method | LC-MS |
| Endotoxin (LAL) | < 1.0 EU/mg |
| Purity Method | HPLC-UV |
Purity Analysis
Method: HPLC-UV with LC-MS Confirmation
% Purity
Thymosin Beta-4 fragment confirmed via LC-MS. Ac-LKKTETQ sequence confirmed. Net peptide content verified by AAA. Molecular weight: 4963.48 Da.
Full Certificate PDF
A signed Certificate of Analysis from our accredited third-party laboratory is on file for batch BH-260206. To receive the full PDF documentation, submit a request using the link below.
Requests are fulfilled within one business day. Include your research institution or laboratory name for expedited processing.
Test History
Entries below reflect pre-launch quality validation runs conducted during our 2024–2025 R&D and inventory build phase. Current inventory is assigned batch code BH-260206.
| Batch | Date | Purity | Endotoxin |
|---|---|---|---|
| BH-241108 | Nov 2024 | 99.55% | Cleared |
| BH-240620 | Jun 2024 | 99.48% | Cleared |
| BH-250410 | Apr 2025 | 99.53% | Cleared |
| BH-260206 | Feb 2026 | 99.0% | ClearedLatest |
Frequently Asked Questions
What does HPLC-UV testing measure?
High-Performance Liquid Chromatography with UV detection (HPLC-UV) separates the compound from potential impurities using a liquid mobile phase. The UV detector measures absorbance at a target wavelength, allowing precise quantification of the target compound and any co-eluting species. Purity is expressed as the area percentage of the main peak relative to all detected peaks.
Why is LC-MS confirmation important?
Liquid Chromatography–Mass Spectrometry (LC-MS) provides definitive identity confirmation by measuring the exact molecular mass of the compound. This rules out isobaric impurities and confirms that the compound detected by HPLC-UV is the correct target molecule — not a structurally similar analogue.
What is the USP <85> endotoxin standard?
The United States Pharmacopeia Chapter <85> Bacterial Endotoxin Test (BET) defines limits for endotoxin contamination in injectable and research-grade materials. Passing this test confirms that endotoxin levels fall below the threshold that would compromise experimental validity in cell-based or in vivo research models.
How often are batches re-tested?
Every new production batch is independently tested before release. We do not rely on retest data from prior batches — each lot receives its own Certificate of Analysis. Historical test results are published above for full transparency.