TB-500 10mg Vials: Handling, Reconstitution and Storage

Search for “TB-500 10mg” and you will find a range of listings, from single vials to multi-vial bundles. The 10mg configuration is one of the most common vial sizes for research-grade TB-500. Understanding how the 10mg vial works, how the concentration is calculated after reconstitution, and how the reconstituted solution should be stored is essential for laboratory work.

This guide explains what a TB-500 10mg vial is, how the concentration is calculated after reconstitution, how the vial should be handled and stored, and what documentation to verify before sourcing.

What a TB-500 10mg vial is

TB-500 is a synthetic peptide fragment corresponding to the actin-binding domain of thymosin beta-4, a naturally occurring protein found in nearly all mammalian cells. The full thymosin beta-4 protein is 43 amino acids long; the fragment sold as TB-500 is a short synthetic version that retains the actin-binding sequence. A phase 2 randomized trial published in 2015 examined the full thymosin beta-4 protein, not TB-500, as an eye-drop formulation in severe dry eye.

A 10mg vial contains 10 milligrams of lyophilised TB-500 powder. The powder is stable for extended periods when stored correctly, but it must be reconstituted with a diluent before laboratory use.

The vial is supplied as a lyophilised powder because the powder is more stable for shipping and storage than a liquid formulation. The lyophilisation process removes water from the peptide solution under vacuum, leaving a stable powder that can be reconstituted at the point of use.

Concentration after reconstitution

The concentration of the reconstituted solution depends on the volume of diluent added. The calculation is the mass of peptide divided by the volume of diluent.

Concentration (mg/mL) = Mass of peptide (mg) / Volume of diluent (mL)

For a 10mg vial, the concentration for common diluent volumes is as follows.

The Alta Peptides reconstitution calculator works out the concentration for any combination of mass and volume.

Reconstitution procedure

The reconstitution process for a 10mg TB-500 vial is the same as for any other lyophilised peptide. The Bachem handling and storage guidelines for peptides explain the principles behind reconstitution and the factors that affect the stability of the resulting solution.

The key steps are:

Step 1. Calculate the volume of diluent needed. Divide the mass of peptide in the vial by the target concentration.

Step 2. Clean the rubber stoppers of both the diluent vial and the peptide vial with a fresh alcohol swab. Allow the alcohol to evaporate.

Step 3. Draw up the calculated volume of diluent using a calibrated syringe. Read the volume at the point where the plunger tip meets the scale.

Step 4. Insert the needle into the peptide vial through the rubber stopper. Angle the needle so that the diluent runs down the inside wall of the vial rather than directly onto the powder.

Step 5. Add the diluent slowly. Rapid addition can cause the powder to clump, which makes it harder to dissolve.

Step 6. Withdraw the needle and dispose of the syringe in an approved sharps container.

Step 7. Swirl the vial gently to dissolve the powder. Do not shake the vial. Shaking can cause foaming and can damage the peptide structure.

Step 8. Allow the vial to sit for a few minutes if needed. Most peptides dissolve quickly, but some take longer.

If the solution appears cloudy or contains particles after several minutes of gentle swirling, do not use it.

Storage after reconstitution

Once reconstituted, the TB-500 solution has a shorter shelf life than the lyophilised powder. The GenScript peptide storage and handling guide recommends storing reconstituted peptides at 2 to 8 degrees Celsius and using them within a defined window.

Bacteriostatic water extends the shelf life of the reconstituted solution compared with sterile water because it contains a preservative. The preservative inhibits microbial growth, but it does not prevent chemical degradation of the peptide.

For long-term storage of the lyophilised powder before reconstitution, the recommended conditions are different. Lyophilised peptides are generally stable at room temperature for short periods, but they should be stored at lower temperatures for longer-term stability.

The researcher’s verification checklist

1. Lot-specific certificate of analysis

A certificate of analysis (COA) is only meaningful if it corresponds to the exact lot you are buying. The COA should list the lot number, the testing laboratory, the report ID, the date the sample was received, and the date the results were published.

2. Measured content, not just label claim

The label states the nominal mass, but the actual mass in the vial may differ slightly. The COA reports a measured content value that reflects the actual fill. For precise work, use the measured content rather than the label claim.

3. Complete analytical panel

A certificate that lists only “purity: 99%” is incomplete. The useful fields are identity by mass spectrometry, purity by HPLC, measured content, endotoxin, and sterility. If a supplier’s COA omits measured content or endotoxin, that is a gap.

4. Named independent laboratory

The testing laboratory should be identified and should be a different organisation from the supplier.

5. Research-use-only boundary

The listing should not publish dosing, administration, or human-use content. A supplier that maintains the boundary consistently is easier to trust than one that publishes human-use content alongside the RUO label.

How Alta Peptides approaches TB-500 documentation

Alta Peptides is a UK-based research peptide supplier that publishes lot-specific documentation for each product configuration. The company’s certificates page collects the reports for all products so that researchers can compare documentation across configurations. The recovery and repair category organises the compounds studied in this research area.

Comparing TB-500 vial sizes

Common questions about TB-500 10mg

What concentration do I get from a 10mg vial?

The concentration depends on the volume of diluent added. With 1ml of diluent, the concentration is 10mg/ml. With 2ml, it is 5mg/ml. With 5ml, it is 2mg/ml.

Should I use the label claim or the measured content?

For precise work, use the measured content from the certificate of analysis. The label states the nominal mass, but the actual mass in the vial may differ slightly.

How should I store a reconstituted TB-500 solution?

The GenScript storage guide recommends storing reconstituted peptides at 2 to 8 degrees Celsius and using them within a defined window. Bacteriostatic water extends the shelf life compared with sterile water.

Can I shake the vial to dissolve the powder faster?

No. Shaking can cause foaming and can damage the peptide structure. Swirl the vial gently to dissolve the powder.

What should a TB-500 COA show?

A complete COA should report identity by mass spectrometry, purity by HPLC with the method stated, measured content or assay value, endotoxin testing, and sterility testing. It should also include the lot number, the testing laboratory’s name, the report ID, and the dates of sample receipt and result reporting.

How do I verify that a COA is real?

Check that the testing laboratory is named and that the report ID can be cross-referenced. Some laboratories publish verification portals where a report ID can be entered to confirm the document’s authenticity.