A neutral laboratory reference for bringing a lyophilized (freeze-dried) research peptide into solution. This page covers sterile handling practice and provides a concentration calculator for documenting the materials in your lab — framed entirely around research use.
Most research peptides are supplied as a lyophilized powder — a stable, freeze-dried solid that preserves the compound during storage and shipping. To handle the material in a laboratory, the powder is brought back into solution by adding a measured volume of a suitable solvent, typically bacteriostatic or sterile water. This step is called reconstitution.
The goal of reconstitution is to reach a known concentration, expressed in milligrams of peptide per millilitre of solution (mg/mL). Concentration is determined entirely by two quantities: the mass of peptide in the vial and the volume of solvent added. Adding less solvent yields a more concentrated solution; adding more solvent yields a more dilute one. The mass of peptide itself does not change — only how much liquid it is dissolved in.
Recording the resulting concentration is essential for accurate laboratory documentation, batch records, and consistent handling of the reconstituted material.
Work in a clean area. Wipe the vial septum and the solvent stopper with an alcohol prep before piercing, and use a fresh sterile needle to avoid introducing contaminants into the solution.
Run the solvent slowly down the inner wall of the vial rather than directly onto the powder. This protects the peptide from the mechanical stress of a fast stream hitting the lyophilized pellet.
Let the powder dissolve on its own, then swirl the vial gently to mix. Avoid vigorous shaking or vortexing, which can foam the solution and degrade sensitive peptides.
Keep reconstituted material refrigerated at 2–8°C and protect it from light. Most peptides are far less stable in solution than as a lyophilized solid, so cold storage matters.
Mark each vial with the compound name, batch number, the calculated concentration, the solvent used, and the date of reconstitution for traceable records.
Record when each vial was reconstituted and review it against the batch's documented stability window. Discard solution that is past its documented handling period.
10 mg ÷ 2 mL = 5.00 mg/mL
The mcg per 0.1 mL figure is a handling reference that expresses the same concentration on a smaller volume scale — useful when recording how much compound is present in a measured aliquot of solution.
It is a property of the solution, not a recommended quantity to remove or use. Concentration math alone says nothing about how a material should be applied.
Bacteriostatic water (sterile water containing a small amount of benzyl alcohol as a preservative) and plain sterile water are the most common choices for reconstituting research peptides. The appropriate solvent depends on the compound and the research protocol; consult the COA and relevant literature.
No. The mass of peptide in the vial is fixed. Adding more or less solvent only changes the concentration of the resulting solution — i.e. how much peptide is present per millilitre — not the total amount of compound.
Keep it refrigerated at 2–8°C, away from light, and avoid repeated temperature swings. Lyophilized powder is generally far more stable than peptide in solution, so only reconstitute what your research workflow will use within the documented stability window.