TB-500 Reconstitution & Dosage Protocol
Thymosin Beta-4 Fragment (17-23) — Complete laboratory preparation guide
Ares Research Lab Team
Analytical Chemistry Division
READ TIME
7 MIN READ
Complete laboratory protocol for reconstituting and storing TB-500 (Thymosin Beta-4 fragment 17-23). Includes sterile preparation, dosage calculations for ex-vivo tissue models, and long-term stability data.
CAS NUMBER
77591-33-4
MOLECULAR FORMULA
C212H350N56O78S
MOLECULAR WEIGHT
4963.5 g/mol
PURITY
≥ 98.8% (HPLC)
SEQUENCE
AcSDKPDMAEIEKFDKSKLKKTETQEKNPLPSKETIEQEKQAGES — full 43-aa fragment
RECONSTITUTION PROCEDURE
TB-500 arrives as lyophilized powder in 3ml borosilicate vials. Due to its larger molecular weight and more complex folding, gentle reconstitution is essential to preserve peptide activity.
Prepare Sterile Workspace
Work in a laminar flow hood or at minimum a disinfected surface. Use 70% isopropyl alcohol on all surfaces and allow to dry.
Draw Bacteriostatic Water
Draw 2.0–3.0ml of bacteriostatic water using a sterile 1ml insulin syringe. For 5mg vials, 2.0ml gives 2.5mg/ml; for 10mg vials, 3.0ml gives 3.33mg/ml.
Slow Targeted Injection
Tilt the vial to 45° and inject the water stream slowly down the inner wall. Avoid direct contact with the powder to prevent mechanical stress on the peptide structure.
Gentle Reconstitution
Allow the vial to sit undisturbed for 2–3 minutes, then swirl gently for 60–90 seconds. TB-500 may take slightly longer to dissolve than smaller peptides. Never shake.
TB-500 is highly hygroscopic in its lyophilized form. Minimize exposure to ambient humidity during reconstitution. Reconstituted TB-500 should be aliquoted and frozen at -20°C within 24 hours for long-term stability.
CONCENTRATION & DOSAGE REFERENCE
TB-500 research concentrations vary based on application. Below are standard reconstitution matrices for Ares Research vials.
RESEARCH DOSAGE RANGES
- →Wound healing models: 100–500 mcg/ml in cell culture media, assessed at 24–96 hours
- →Tendon/ligament repair ex-vivo: 10–100 mcg per explant, refreshed every 48 hours
- →Angiogenesis assays (tube formation): 1–50 mcg/ml in Matrigel or collagen matrices
- →In-vitro migration assays (scratch/wound): 5–25 mcg/ml, observed at 6–24 hours
STORAGE & STABILITY
TB-500 is less stable than smaller peptides like BPC-157 due to its larger size and complex tertiary structure. Strict storage protocols are required.
- →Lyophilized powder: store at -20°C, stable ≥ 18 months when sealed and protected from moisture
- →Reconstituted solution: refrigerate at 2–8°C, use within 14 days maximum
- →Aliquot immediately after reconstitution for long-term storage: 0.5ml per vial, freeze at -20°C
- →Never refreeze thawed aliquots — discard any unused portion
- →Store in amber or foil-wrapped vials to protect from photodegradation
ANALYTICAL SPECIFICATIONS
REFERENCES & CITATIONS
1. Goldstein, A.L. et al. (2012). Thymosins in health and disease. Annals of the New York Academy of Sciences, 1269(1), 1–4.
2. Malinda, K.M. et al. (2008). Thymosin beta4 promotes wound repair. Annals of the New York Academy of Sciences, 1112(1), 117–125.
3. Qiu, P. et al. (2011). Thymosin beta4 accelerates wound healing. Journal of Investigative Dermatology, 131(5), 1117–1125.
4. Evans, M. et al. (2013). The regenerative peptide TB-500. Journal of Experimental & Integrative Medicine, 3(4), 287–290.
RESEARCH DISCLAIMER
All protocols are intended solely for qualified laboratory research professionals. Not for human use or consumption. For in-vitro and laboratory research only.
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— FREQUENTLY ASKED QUESTIONS
Q: Can I reconstitute TB-500 with sterile water instead of bacteriostatic water?
While possible, bacteriostatic water is strongly recommended. TB-500 solutions are often studied over 10–14 day protocols. Without benzyl alcohol, bacterial contamination risk increases significantly.
Q: My TB-500 solution is slightly cloudy — is it still usable?
Cloudiness may indicate incomplete dissolution or temperature-related precipitation. Warm the vial to room temperature (never heat) and swirl gently for 2 additional minutes. If cloudiness persists, discard the vial.
Q: What is the difference between TB-500 and Thymosin Beta-4?
TB-500 is the 43-amino-acid active fragment of the full 43-aa Thymosin Beta-4 protein. Research indicates TB-500 contains the core regenerative sequence while being more stable and cost-effective for laboratory studies.
Q: How should I aliquot reconstituted TB-500?
Draw the full reconstituted volume into a sterile syringe, then dispense 0.5ml portions into separate sterile vials. Cap tightly and freeze at -20°C immediately. Label each aliquot with date and concentration.
Q: Can TB-500 and BPC-157 be studied together?
Many researchers evaluate both peptides in combination protocols for tissue repair studies. However, each peptide should be reconstituted separately in its own vial and combined only at the point of application to prevent stability interactions.
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