What is bacteriostatic water?
Bacteriostatic water is sterile water with benzyl alcohol. In research it is used to dissolve freeze-dried peptides.
What it is
Bacteriostatic water is sterile water to which 0.9 percent benzyl alcohol has been added. The base is water for injection; the benzyl alcohol is the additive that sets it apart from plain sterile water.
Why it is used in research
Freeze-dried peptides are supplied in the lab as a powder and must be dissolved before use. Bacteriostatic water is a common liquid for this, because the benzyl alcohol slows bacterial growth. As a result a dissolved solution stays usable in a research setup longer than with plain water.
Benzyl alcohol as a preservative
Benzyl alcohol acts as a preservative: it holds micro-organisms back in a vial that is drawn from several times. The term bacteriostatic means that growth is slowed, not that everything is killed. This information is general and describes a laboratory and research context, not use in humans or animals.
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