Thymosin Alpha-1 reconstitution protocol

This protocol describes the reconstitution and storage of lyophilized Thymosin Alpha-1 (Tα1) in standard research workflows. Tα1 is a 28-amino-acid compound derived from the thymus, studied predominantly for immunomodulatory effects — it has been used clinically in some countries as an adjunct for hepatitis B research and as part of certain immune-modulation protocols. Values below reflect published handling literature; study design is the responsibility of the qualified investigator.

At a glance

Parameter	Value
Recommended diluent	Bacteriostatic Water (USP, 0.9% benzyl alcohol)
Recommended volume (10 mg vial)	2.0 mL
Final concentration	5 mg/mL
Stability — lyophilized	≥24 months at -20 °C, sealed, light-protected
Stability — reconstituted	30 days at 2–8 °C in original vial
Routes studied	Subcutaneous (most common), intramuscular

Procedure

1. Equilibrate the vial to room temperature.
2. Sterile prep: wipe stopper with isopropyl. Use sterile syringe and needle.
3. Inject diluent slowly along the inner wall.
4. Swirl gently. Do not shake. Dissolution completes within 30–60 seconds.
5. Verify: solution should be clear and colorless.

Compound notes

Thymosin Alpha-1 (sequence Ac-SDAAVDTSSEITTKDLKEKKEVVEEAEN) is a 28-residue acetylated compound. The N-terminal acetylation is functional — non-acetylated Tα1 has significantly reduced activity. When verifying a COA, the mass spec section should confirm the acetyl modification (theoretical mass includes the +42 Da from N-acetylation).

The compound has a relatively short plasma half-life (~2 hours) but its biological effects on immune cell populations persist longer than the pharmacokinetic exposure would suggest — research protocols typically use daily or every-other-day dosing for in-vivo immunomodulation studies. The molecule is well-behaved in standard biological buffers and tolerant of typical ionic strength variation.

Mechanism: Tα1 activates Toll-like receptor 9 and influences dendritic cell maturation, which is the basis for both clinical (hepatitis B adjunct, immune reconstitution research) and laboratory applications.

Storage

Reconstituted Tα1 is stable for approximately 30 days at 2–8 °C. For longer storage, aliquot into sterile single-use tubes and freeze at -20 °C or colder. Lyophilized stability is ≥24 months at -20 °C light-protected.

Notes

This protocol describes reconstitution parameters from published handling literature. It is not a recommendation for any specific research protocol or design. For research use only. Not for human or veterinary use.

References

1. Goldstein AL, Goldstein AL. From lab to bedside: emerging clinical applications of thymosin alpha 1. Expert Opin Biol Ther 2009;9:593–608. PMID: 19392576