Description
Bacteriostatic Water for Injection (0.9% benzyl alcohol in sterile water) is a multi-dose pharmaceutical-grade solvent established as the standard reconstitution vehicle for lyophilized peptides and proteins in research settings.
Research Overview
The formulation of BAC water — USP-grade sterile water with 0.9% benzyl alcohol as a preservative — has been studied and standardized for its ability to inhibit bacterial proliferation across multiple-use vials without significant cytotoxicity at this concentration. Research on reconstituted peptide stability has consistently demonstrated advantages of BAC water over normal saline for many lyophilized compounds, with benzyl alcohol’s mild acidity (pH ~5.75) contributing to favorable stability conditions for peptide storage. Bioavailability and degradation studies examining peptide integrity post-reconstitution have established that proper reconstitution vehicle selection is a material variable in research outcomes, influencing peptide aggregation, oxidation rate, and receptor-binding activity over the storage period. Published guidance on lyophilized protein reconstitution, including from regulatory and pharmaceutical stability literature, has consistently endorsed BAC water as the preferred vehicle for protocols requiring repeated sampling from a single vial. Research teams extending peptide stability work continue to examine the role of reconstitution conditions — including vehicle pH, temperature, and preservative selection — in maintaining compound integrity across multi-week research protocols.
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