Understand the source comparison
BAC Water Sterile Dilution: Reconstitution Method Comparison
Bacteriostatic Water (0.9% benzyl alcohol) 1–3 minutes at 20–25°C 28 days at 2–8°C Benzyl alcohol inhibits bacterial growth for multi-dose use Compatible with most peptides; benzyl alcohol may denature highly sensitive compounds Industry standard for research-
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- Bacteriostatic Water (0.9% benzyl alcohol)
- 1–3 minutes at 20–25°C
- 28 days at 2–8°C
- Benzyl alcohol inhibits bacterial growth for multi-dose use
- Compatible with most peptides; benzyl alcohol may denature highly sensitive compounds
- Industry standard for research-grade peptide reconstitution. Proven stability, broad compatibility, multi-dose safety
- Sterile Water for Injection (preservative-free)
- Single-use only (no preservative)
- Sterile only until vial is breached; must discard after first draw
- Universal compatibility; no preservative interference
- Required for peptides incompatible with benzyl alcohol (e.g., some cyclic peptides); impractical for multi-dose protocols
- Normal Saline (0.9% NaCl)
- 2–5 minutes (salt increases ionic strength)
- 24–48 hours refrigerated (no preservative)
- No antimicrobial protection
- Compatible with most peptides; ionic strength may stabilise charged residues
- Acceptable for single-dose reconstitution; salt content may interfere with LC-MS analysis in some assays
- Acetic Acid Solution (0.1–1% acetic acid in sterile water)
- 1–2 minutes (acidic pH accelerates dissolution)
- 7–14 days at 2–8°C
- Acidic pH provides some antimicrobial effect but not preservative-level
- Required for acid-labile peptides prone to aggregation at neutral pH
- Specialised use case. Necessary for peptides like GLP-1 analogs that aggregate above pH 4.5