The preservative is present at 9.4 mg/mL, or 87 mM, which slows microbial growth in a bottle that is opened many times. It absorbs ultraviolet light below 230 nm and near 257 nm, appears as a peak in HPLC, and is cytotoxic to cultured cells above a few millimolar, so plain reagent-grade water is the better solvent for spectroscopy, chromatography and cell-based work.
Neither reagent is buffered; both sit near pH 5–6 from dissolved carbon dioxide. The saline adds 154 mM sodium chloride, which can reduce the solubility of a charged peptide.
See also
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Text
Cosmic Peptides. (2026, October 30). Bacteriostatic water: glossary entry. Cosmic Peptides Research Library. Retrieved October 30, 2026, from https://cosmicpeptides.com/research/glossary/bacteriostatic-water
BibTeX
@misc{cosmicpeptides_research_glossary_bacteriostatic_water,
author = {{Cosmic Peptides}},
title = {Bacteriostatic water: glossary entry},
howpublished = {Cosmic Peptides Research Library},
year = {2026},
month = oct,
url = {https://cosmicpeptides.com/research/glossary/bacteriostatic-water},
urldate = {2026-10-30},
note = {Last reviewed 2026-10-30}
} RIS
TY - ELEC AU - Cosmic Peptides TI - Bacteriostatic water: glossary entry T2 - Cosmic Peptides Research Library PB - Cosmic Peptides PY - 2026 DA - 2026/10/30 UR - https://cosmicpeptides.com/research/glossary/bacteriostatic-water Y2 - 2026/10/30 LA - en ER -
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