PT-141 (Bremelanotide) is supplied as a lyophilised powder and reconstituted in the laboratory before use. As a cyclic peptide it is robust in powder form, but reconstitution technique still matters for clean, reproducible solutions. This is a general research-handling overview; for the compound's chemistry see our PT-141 research guide. Everything here is for laboratory research use only.
What you'll need
- The sealed vial of lyophilised PT-141
- Bacteriostatic water (the most commonly cited solvent for multi-use vials)
- A sterile syringe and needle
- An alcohol wipe and a clean work area
Step 1: choose your solvent
PT-141 is water-soluble, and bacteriostatic water is the usual choice for research handling because it helps limit microbial growth where a vial will be accessed more than once. Plain sterile water is an option for single-use preparations.
Step 2: add the solvent gently
Wipe the septum, draw your measured volume, and run the solvent slowly down the inner wall of the vial onto the powder rather than directly onto it. This minimises foaming and stress on the peptide.
Step 3: let it dissolve — don't shake
Let the powder dissolve, swirling gently if needed. Avoid vigorous shaking. The solution should become clear; cloudiness or visible particles suggest a handling issue or compromised material.
Step 4: work out the concentration
Concentration equals the vial's peptide mass divided by the solvent volume. For instance, 10 mg in 2 mL gives 5 mg/mL. Use our reconstitution calculator to plan volumes precisely for your protocol.
Step 5: store the solution correctly
Keep the lyophilised vial at -20°C until use. Once in solution, store refrigerated at 2-8°C, protected from light, and minimise freeze-thaw cycles.
Common mistakes to avoid
- Shaking instead of swirling.
- Adding solvent too quickly and creating foam.
- Leaving the solution at room temperature rather than refrigerating it.
- Repeated freeze-thaw — aliquot before freezing for longer projects.
Frequently asked questions
PT-141 is water-soluble and is commonly reconstituted with bacteriostatic water for research handling.
Divide the vial's peptide mass by the solvent volume (e.g. 10 mg in 2 mL = 5 mg/mL). Our reconstitution calculator does this for you.
Refrigerated at 2-8°C, protected from light, with freeze-thaw cycles minimised; the lyophilised vial is stored at -20°C until use.
Research-grade PT-141
Greater than 99% purity, lyophilised powder, same-day dispatch before 3PM with tracked UK & EU delivery. Research use only.
Buy PT-141 →Disclaimer: All products supplied by PurePeptides are strictly for laboratory research use only. They are not for human or animal consumption and are not medical products. This article is informational and is not medical, clinical, or dosing advice.