Batch documentation
Certificate of analysis
Apex Laboratory results for the listed configurations. Match the lot on your label with the report.
TB-500 - 10 mg
- TB-500 chromatographic purity
- 99.923 % integrated detector area
- TB-500 active content
- 10.0192 mg/vial
- Bacterial endotoxins
- <0.025 EU/mg active-equivalent
- Sterility: FTM
- No growth at 14 days in all 20 units
Chromatographic purity by analyte
About this graph
Recorded scalar results against the stated specification. Each row uses its own labeled scale; purity is detector-area purity, not active-material content.
Measured active content
About this graph
Calibrated active content, concentration or activity compared with the stated same-unit specification. Each row uses its own labeled scale; no conversion from chromatographic purity is made.
TB-500 - 5 mg
- TB-500 chromatographic purity
- 99.937 % integrated detector area
- TB-500 active content
- 4.9998 mg/vial
- Bacterial endotoxins
- <0.025 EU/mg active-equivalent
- Sterility: FTM
- No growth at 14 days in all 20 units
Chromatographic purity by analyte
About this graph
Recorded scalar results against the stated specification. Each row uses its own labeled scale; purity is detector-area purity, not active-material content.
Measured active content
About this graph
Calibrated active content, concentration or activity compared with the stated same-unit specification. Each row uses its own labeled scale; no conversion from chromatographic purity is made.
TB-500 - 2 mg
- TB-500 chromatographic purity
- 99.852 % integrated detector area
- TB-500 active content
- 2.00542 mg/vial
- Bacterial endotoxins
- <0.025 EU/mg active-equivalent
- Sterility: FTM
- No growth at 14 days in all 20 units
Chromatographic purity by analyte
About this graph
Recorded scalar results against the stated specification. Each row uses its own labeled scale; purity is detector-area purity, not active-material content.
Measured active content
About this graph
Calibrated active content, concentration or activity compared with the stated same-unit specification. Each row uses its own labeled scale; no conversion from chromatographic purity is made.
TB-500 is a thymosin beta-4 fragment supplied by Apex Laboratory as a high-purity research peptide intended strictly for in-vitro laboratory research and development applications.
Compound Overview
Apex Laboratory identifies its TB-500 material as Ac-LKKTETQ, an acetylated seven-amino-acid fragment corresponding to residues 17–23 of thymosin beta-4. The full-length parent has 43 residues. The shared sequence does not establish that the fragment reproduces the parent’s actin-binding behavior or biological effects.
Research Background & Published Literature
The TB-500 identity and research guide separates analytical identification, fragment and metabolite experiments, and studies of the full-length parent protein.
- Esposito and colleagues (2012): analytical identification of Ac-LKKTETQ
- 2024 fragment/metabolite study: fibroblast findings include Ac-LKKTE, a distinct metabolite
These studies do not establish a human treatment benefit for this research material. Match the tested molecule and experimental model before applying a published finding to a laboratory question.
Technical Specifications
- Product Name: TB-500
- Classification: Thymosin Beta-4 Fragment
- Structural Description: 7-amino-acid peptide (Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln-OH), synthetic fragment of Thymosin Beta-4 (residues 17-23)
- CAS Number: 885340-08-9
- Molecular Weight: 889.01 g/mol
- Purity: ≥99% (verified by HPLC and Mass Spectrometry)
- Physical Form: Lyophilized (freeze-dried) powder
- Intended Use: In-vitro research use only — not for human consumption
Storage, Handling & Stability Guidelines
Follow the applicable material documentation and your laboratory’s validated storage and handling procedures. A compound name alone does not establish a universal reconstituted shelf life. The peptide storage guide explains the variables to consider when planning laboratory handling.
- Minimize time at ambient temperature during handling to preserve compound integrity.
- Avoid moisture exposure by resealing vials promptly after each withdrawal.
- Use appropriate personal protective equipment and follow your institution’s chemical safety protocols at all times.
- Label all aliquots with the compound name, concentration, date of reconstitution, and operator initials for complete traceability.
Quality Assurance & Analytical Verification
Use the batch verification panel on this page and the COA library to inspect the applicable analytical record. Match the product, nominal amount, sample or batch identifier, report date and reported tests. Chromatographic purity, molecular identity and measured content answer different questions; rely on the methods and results actually shown in the matching report.
Frequently Asked Questions
What is the relationship between TB-500 and Thymosin Beta-4?
Apex’s TB-500 is the acetylated seven-residue fragment Ac-LKKTETQ; thymosin beta-4 is the 43-residue parent protein. Their sequence relationship does not establish identical actin-sequestering activity. The TB-500 sequence and evidence explanation shows the difference.
What is the molecular weight of TB-500?
TB-500 has a molecular weight of approximately 889.01 g/mol (CAS 885340-08-9).
Is this product approved for human use?
No. All compounds sold by Apex Laboratory are classified as chemical research reagents intended strictly for in-vitro laboratory research. They are not approved for human consumption, veterinary use, or any therapeutic application. Purchasers who imply intended bodily use will have their orders cancelled and accounts permanently suspended.
What documentation is available for this compound?
Check the batch verification panel and Lab Verified archive for the applicable analytical report and its stated methods. For a specific sample or batch record, use the contact page. A report for one sample should not be assumed to document a different shipment.
Is bulk ordering available?
Yes. For bulk quantities, custom packaging requirements, or recurring supply agreements, contact our team with the compound name, desired quantity, preferred dosage format, and your target delivery timeline. Volume pricing is available for qualifying orders.
Related Research Compounds
Researchers studying thymosin beta-4 fragment pathways may also be interested in related compounds available from Apex Laboratory, including BPC-157, BPC-157 + TB500 Blend, GHK-Cu. Explore our complete research catalog to browse all available peptides, reagents, and laboratory supplies, or visit our About page to learn more about our quality verification process.
Shipping, Packaging & Delivery
All orders placed before 2:00 PM ET ship the same business day via tracked domestic carriers. Products are packaged in insulated, temperature-appropriate containers designed to preserve compound stability during transit. Upon delivery, transfer all materials to appropriate storage conditions immediately. For time-sensitive research protocols or special delivery requirements, contact our support team in advance to coordinate optimal shipping timing for your laboratory workflow.
Research Use Disclaimer
For in-vitro research use only. Not for human consumption. All products sold by Apex Laboratory are intended exclusively for qualified researchers, accredited laboratories, and educational institutions. Purchasers assume full responsibility for ensuring safe handling, proper storage, and compliance with all applicable federal, state, and local laws, regulations, and institutional policies governing the purchase and use of chemical research reagents.
