BAC WATER

Bacteriostatic Water — Sterile Reconstitution Solvent for Research Peptides

Bacteriostatic Water (BAC Water) is a sterile preparation of water for injection containing 0.9% benzyl alcohol as a bacteriostatic preservative. It is the standard reconstitution solvent for lyophilised research peptides, providing a sterile, multi-draw-compatible solution that maintains microbiological integrity across multiple withdrawals from the same vial — essential for longitudinal research protocols where a reconstituted peptide solution is used across multiple experimental time points.

Why BAC Water for Peptide Research

• Multi-draw compatibility — The 0.9% benzyl alcohol content inhibits microbial growth, allowing multiple sterile withdrawals from the same vial over weeks — not possible with plain sterile water, which does not contain a preservative
• Peptide stability — Most lyophilised research peptides reconstitute stably in aqueous solution at neutral pH; BAC water is pH-adjusted and isotonic, providing an optimal reconstitution environment for the majority of peptide compounds
• Standard laboratory practice — BAC water is the most widely used reconstitution vehicle in peptide research protocols; using a consistent, standardised solvent reduces inter-experiment variability
• Compatibility — Compatible with all OL Research lyophilised peptide compounds. For acid-sensitive peptides, dilute acetic acid may be preferred for initial reconstitution before diluting with BAC water

Product Specifications

Reconstitution Guidance

For detailed reconstitution protocols — including volume calculations, concentration tables, and storage guidance for reconstituted peptides — see the OL Research Peptide Reconstitution Guide.

General approach: draw the required volume of BAC water into a sterile syringe, inject slowly down the side of the lyophilised peptide vial (avoid injecting directly onto the powder), swirl gently — do not shake. Store reconstituted solution at 2–8°C.

Frequently Asked Questions

Can plain sterile water be used instead?
Plain sterile water is not preservative-free bacteriostatic — once the vial seal is broken, it is susceptible to microbial contamination and should only be used for single-draw applications. For multi-draw research protocols, BAC water is the correct choice.

Does benzyl alcohol affect peptide stability?
At 0.9% concentration, benzyl alcohol is not known to degrade the vast majority of research peptides. It is widely accepted as a compatible solvent for peptide reconstitution in laboratory settings.

How long is reconstituted peptide stable in BAC water?
Most lyophilised peptides, once reconstituted in BAC water, are stable for 4–6 weeks at 2–8°C under normal research laboratory conditions. For extended storage, aliquot and freeze at -20°C; minimise freeze-thaw cycles.

Complete Your Research Setup

• Peptide Pen Injector — Precision delivery device for reconstituted peptide solutions
• Peptide Pen Kit — Pen + cartridges + BAC water bundle

⚠️ For laboratory research use only. Not for human injection, veterinary use, or clinical application.