Reconstitution Basics for the Lab

Reconstitution is where most avoidable variability enters a research workflow. The compound arrives as a lyophilized cake; how it is brought back into solution determines whether your concentration is what you think it is.

Choose the diluent first. Bacteriostatic water contains 0.9% benzyl alcohol and is intended for containers that will be accessed more than once. Sterile water has no preservative and is single-use. The choice changes the effective stability window, so record it.

The math is straightforward: concentration in mg/mL equals vial strength in mg divided by diluent volume in mL. A 10 mg vial reconstituted with 2 mL yields 5 mg/mL. Write the resulting concentration and the date directly on the vial.

Technique matters more than most people expect. Add the diluent slowly down the inside wall of the vial rather than directly onto the cake. Swirl gently until dissolved. Never shake — mechanical agitation shears peptide chains and produces visible foaming that indicates degradation.

Store the reconstituted solution at 2-8°C, protected from light, and use it within the window listed on the product page. Freeze-thaw cycles are cumulative damage; aliquot if you expect repeated access.