Bacteriostatic Water (BAC) 3ml

Using a sterile syringe, withdraw the desired volume of bacteriostatic water and inject it slowly down the inner wall of the vial containing the lyophilized peptide. Allow the solvent to dissolve the peptide cake by gentle swirling — do not vortex or shake vigorously, as this can cause aggregation and denaturation at the air-liquid interface. Once fully dissolved (solution should be clear), the reconstituted preparation can be stored at 2–8°C for up to 28 days. Always use aseptic technique and swab vial stoppers with 70% isopropyl alcohol before each withdrawal.

At the standard 0.9% concentration used in bacteriostatic water, benzyl alcohol has been shown to be compatible with most research peptides without significant impact on stability or bioactivity. Published studies have demonstrated that benzyl alcohol at bacteriostatic concentrations does not meaningfully accelerate peptide deamidation, oxidation, or aggregation pathways under recommended storage conditions (2–8°C, protected from light). However, for particularly sensitive or high-value preparations, researchers may opt for single-use sterile water reconstitution to eliminate any theoretical preservative interaction.

The number of reconstitutions depends on the volume used per peptide vial. Common reconstitution volumes range from 0.5 ml to 2.0 ml per peptide vial, depending on the desired concentration for the specific research protocol. A single 3 ml vial of bacteriostatic water can therefore reconstitute approximately 1–6 peptide vials. Researchers should calculate their required reconstitution volume based on the peptide quantity and the target concentration needed for their assay system.