TB-4/TB-500: Handling, Storage, and Reconstitution Guide

This guide covers lab handling, storage, and reconstitution of TB-4/TB-500. TB-4/TB-500 is full-length thymosin beta-4, supplied as a lyophilized research peptide. Every step below is lab best practice for in-vitro and animal-model prep. None of it is human-use instruction.

How should TB-4/TB-500 be handled and stored?

Store TB-4/TB-500 sealed, cool, dry, and dark. It ships as a solid, white lyophilized (freeze-dried) powder in a sealed glass vial.

• Store the powder at or below 25 degrees Celsius.
• Keep it sealed and protected from heat, light, and moisture.
• For long storage, keep it as powder and refrigerate or freeze it.

It is a large peptide of 43 residues. A careful cold chain helps keep it intact.

Puritide supplies TB-4/TB-500 in a 20 mg vial. So the working-stock strength follows from the diluent volume chosen for that mass.

A 43-residue protein calls for gentle prep and stable storage. Larger peptides are more prone to shear. They are also more prone to damage across heating and cooling cycles. So careful reconstitution and steady aliquoting matter even more for keeping the whole molecule intact.

Plan aliquot sizes around how the study will use the 20 mg vial. Thaw only what each experiment needs. This protects the rest of the material. It also keeps actin and angiogenesis results comparable across a long series of assays.

How is TB-4/TB-500 identity confirmed before use?

Check the material against its documents before any prep. The key identifiers are:

• Molecular formula: C212H350N56O78S
• Molecular weight: about 4963.44 g/mol
• CAS number: 77591-33-4
• Synonym: thymosin beta-4

Matching these to the certificate of analysis is the first tracing checkpoint. It anchors the actin and angiogenesis assays described in the TB-4/TB-500 mechanism of action.

How is TB-4/TB-500 reconstituted for in-vitro work?

Reconstitute TB-4/TB-500 with bacteriostatic water or another solvent that suits the assay. Add the diluent slowly down the inner wall of the vial, not onto the powder. Let the peptide dissolve gently. Swirl the vial. Do not vortex hard or shake it, since this can shear the peptide.

• Add diluent down the vial wall, not onto the pellet.
• Allow gentle, full dissolving of this larger peptide.
• Inspect the solution before use.
• Work out concentration from the labeled mass and the diluent volume.

How should TB-4/TB-500 be aliquoted to limit freeze-thaw?

Split reconstituted TB-4/TB-500 into single-use aliquots. Then each experiment draws from a vial that has been thawed only once. Label each aliquot with:

• Compound name
• Concentration
• Date
• Lot number

Fewer freeze-thaw cycles keep results comparable across replicates. This applies to the actin and repair tests in the TB-4/TB-500 research applications. It also matches the practice in the TB-500 handling guide.

How should TB-4/TB-500 working solutions be stored?

Store reconstituted aliquots frozen for longer holds. Keep short-term working solutions cold and shielded from light.

Hold conditions steady through the study period. Check storage records as part of quality checks. Recording time at each temperature supports repeatable work and audit readiness. The same approach appears in the BPC/TB500 blend handling guide, where a related fragment is used.

How is the TB-4/TB-500 COA and lot verified?

Each TB-4/TB-500 batch ships with a certificate of analysis (COA) checked by a third party. It documents:

• Purity by HPLC or reverse-phase chromatography
• Identity confirmed by mass spectrometry
• Lot, testing date, and method details

Check the COA against the vial label. Keep it with the batch records. Sample COAs can be requested before purchase.

What PPE and institutional rules apply to TB-4/TB-500?

Handle TB-4/TB-500 as an investigational material. Follow the lab's SOPs, chemical hygiene plan, and approved protocols.

• Wear a lab coat, gloves, and eye protection.
• Use engineering controls where required.
• Have trained staff do all handling in controlled spaces.

Specs are on the TB-4/TB-500 product page.

At intake, match the vial to its recorded synonyms. Confirm that it looks like the expected white lyophilized powder. Take care to record that the material is the full-length 43-residue protein, not the fragment. This large peptide is often used in comparative designs. Clear records at receipt stop the protein and its fragment from being mixed up later.

How is traceability kept for a large peptide like TB-4/TB-500?

TB-4/TB-500 is a large 43-residue protein. It rewards careful records of the conditions that keep it intact. A full record links these items:

• The lot number and certificate of analysis
• The reconstitution solvent
• The final concentration
• Each aliquot's storage temperature and freeze-thaw count

With this record, the material behind an actin or angiogenesis result can be traced exactly.

Some studies compare the full-length protein with its fragment. There, records should make the difference impossible to miss. Note which material was used in each arm. This keeps the two from being confused later. It also keeps fragment versus full-length comparisons readable across the study.

Steady handling is, in the end, a way to make results repeatable. Picture a TB-4/TB-500 batch that is checked against its COA, mixed gently, aliquoted to limit freeze-thaw, stored in a stable cold chain, and fully recorded. It gives every later experiment the same reliable starting material. That consistency lets separate labs compare results and build on each other's work with confidence.

Sometimes a study later proves hard to repeat. A full handling record often lets labs tell a real biological difference from a prep artifact. That is why careful TB-4/TB-500 handling pays off across a whole project.

For research use only. These handling notes describe laboratory practice for TB-4/TB-500 as a research material supplied by Puritide Research. It is not approved for human or veterinary use, and nothing here constitutes medical or administration guidance.