Why the diluent matters as much as the peptide in laboratory handling.
Lyophilized (freeze-dried) peptides arrive as a dry powder and must be reconstituted in a liquid before laboratory use. The most common diluent is bacteriostatic water.
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol. The benzyl alcohol is a preservative that inhibits bacterial growth, which allows a vial to be accessed multiple times.
Sterile water for injection has no preservative and is intended for single use, because once the vial is opened it can grow contaminants. Bacteriostatic water is designed for multi-use vials. Some compounds and some experimental designs call for one or the other, so the choice should follow the protocol.
Common laboratory practice includes using sterile technique, cleaning vial stoppers before each access, avoiding vigorous shaking that can damage peptide structure, and storing reconstituted solutions refrigerated. Read the storage and reconstitution primer →
Written for a research audience. Midas products are for laboratory research use only, not for human consumption.