TB-500: Handling, Storage, and Reconstitution Guide

This guide covers lab handling, storage, and reconstitution of TB-500. TB-500 is the actin-binding fragment of thymosin beta-4, supplied as a freeze-dried research peptide. Every step below is lab best practice for in-vitro and animal-model preparation. None of it is guidance for human use.

What are the basics of TB-500 handling and storage?

TB-500 ships as a solid, white, freeze-dried powder in a sealed glass vial. Freeze-dried is also called lyophilized. Store the powder at or below 25 degrees Celsius. Keep it sealed and away from heat, light, and moisture.

For long storage, keep it freeze-dried and in a fridge or freezer. Limit contact with humidity and temperature swings. This keeps the peptide intact across a study.

Puritide supplies TB-500 in 5 mg and 10 mg vials. The strength of a working stock depends on how much liquid is added to the labeled mass.

TB-500 is a short, acetylated peptide of seven residues. It is easy to handle and tends to dissolve well. Handling focuses on the basics that keep a freeze-dried peptide reliable:

• Protection from moisture and heat.
• Gentle reconstitution.
• Single-use aliquots.
• Steady cold storage across the study.

TB-500 comes in more than one vial size. So note which size each stock came from, along with its strength. This keeps batches from being mixed up when several are in use at once.

How is TB-500 identity confirmed before use?

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

• Molecular formula: C38H68N10O14
• Molecular weight: about 889.0 g/mol
• CAS number: 885340-08-9
• Synonyms: Ac-LKKTETQ and thymosin beta-4 fragment (17-23)

Matching these to the certificate of analysis is the first tracking checkpoint. It also anchors the actin and migration assays described in the TB-500 mechanism of action.

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

Reconstitute freeze-dried TB-500 with bacteriostatic water or another solvent that suits the assay. Add the liquid slowly down the inner wall of the vial, not onto the powder. Let the peptide dissolve gently.

Swirl the vial. Do not shake it or vortex it hard, since that can damage the peptide.

• Add liquid against the vial wall, not onto the pellet.
• Allow gentle, complete dissolving.
• Inspect the solution before use.
• Work out strength from the labeled mass and liquid volume.

Why split TB-500 into aliquots?

Split reconstituted TB-500 into single-use portions, called aliquots. Then each test draws from a vial that was thawed only once.

Label each aliquot with the compound name, strength, date, and lot number. Fewer freeze-thaw cycles keep results comparable across repeats. This applies to the migration and angiogenesis tests in the TB-500 research applications.

How should TB-500 solutions be stored?

Store reconstituted aliquots frozen for longer holds. Keep short-term working solutions cold and out of light. Hold conditions steady through the study. Check storage records as part of quality control.

This practice matches the TB-4/TB-500 handling guide for the full-length protein. It also matches the BPC/TB500 blend handling guide, where the fragment appears.

How are the COA and lot checked?

Each TB-500 batch ships with a certificate of analysis, or COA, checked by a third party. It documents:

• Purity, by HPLC or reverse-phase chromatography.
• Identity, confirmed by mass spectrometry.
• Lot, test 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 lab rules apply to TB-500?

Handle TB-500 as an investigational material. Follow lab SOPs, chemical hygiene plans, and approved protocols. Wear a lab coat, gloves, and eye protection. Use fume hoods or other controls where required. Only trained staff should handle it, in controlled settings. Specs are on the TB-500 product page.

At intake, match the vial to its listed synonyms, such as Ac-LKKTETQ. Confirm the expected white, freeze-dried look. Record that the material is the actin-binding fragment, not the full-length protein. This keeps the fragment's data useful as a reference across studies and against the complete molecule.

Why does documentation matter for cross-study comparison?

TB-500 is a widely used fragment that often serves as a reference point. Consistent records make its data comparable across studies. For each batch, record the vial size, liquid volume, final strength, lot number, and COA. Then other teams can line up their results against a common, well-defined baseline.

TB-500 is sometimes run beside the full-length protein or inside a blend. In that case, the record should note which material was used and at what strength. This keeps the fragment's role clearly separate. That clarity lets the fragment work as a reliable reference for broader thymosin beta-4 biology.

Consistent handling is, in the end, a way to make results repeatable. Picture a TB-500 batch that is checked against its COA and reconstituted gently. It is split into aliquots, stored cold, and fully documented. That batch gives every later test the same reliable starting material. Other labs can then compare results and build on each other's work with confidence.

Sometimes a study proves hard to repeat. A complete handling record often helps labs tell a real biological difference from a batch artifact. That is why careful TB-500 handling pays off across a whole project.

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