AA Water
Research Use Only · Not for Human Consumption
0.6% acetic acid diluent for lyophilized research peptides with limited aqueous solubility.
Dilute acetic acid solution used as a diluent for lyophilized research peptides with limited solubility in bacteriostatic water.
Chemistry
| CAS# | Formula | Molar Mass |
|---|---|---|
| CAS Number: 64-19-7 | Molecular Formula: C2H4O2 | Molar Mass: 60.05 g/mol |
What is AA Water?
Sterile 0.6% acetic acid in water (CAS 64-19-7). Laboratory diluent for research peptides. Research use only.
AA Water is a sterile aqueous diluent containing 0.6% acetic acid (CAS 64-19-7; molecular formula C₂H₄O₂; molar mass 60.05 g/mol). Acetic acid is a weak organic acid; at this dilute concentration the solution is mildly acidic relative to neutral bacteriostatic water, which is why it is selected when a lyophilized research peptide shows limited solubility in neutral aqueous media.
The practical distinction versus bacteriostatic water is chemical role, not brand preference. Bacteriostatic water typically relies on 0.9% benzyl alcohol as a preservative so a multi-dose vial can support repeated aseptic withdrawals. AA Water’s acetic acid is present as a solvent and pH-adjusting component for reconstitution chemistry — it is not marketed here as a preservative system. Treat an opened AA Water vial as an unpreserved laboratory diluent: use aseptic technique, aliquot what you need, and discard unused solution rather than assuming a multi-week multi-use window.
For laboratory buyers comparing diluents, match the peptide’s documented solubility notes to the diluent class. Peptides that remain poorly soluble or cloudy in neutral bacteriostatic water are the usual reason an acetic acid diluent appears on a research bill of materials. Appearance alone (clear versus cloudy) is a handling observation, not purity proof — identity and purity still belong on the peptide’s own lot COA, not on the diluent label.
Peptide Foundry supplies AA Water sterile-filtered in a 30 ml glass vial with a rubber stopper and flip-off cap. Published catalog chemistry for the acetic acid component is CAS 64-19-7 / C₂H₄O₂ / 60.05 g/mol at 0.6% in sterile water. Confirm the live product panel if vial size or concentration labeling rotates after publish.
General laboratory reconstitution and diluent literacy — including when researchers choose bacteriostatic water versus an acidic diluent — is covered in the public research guide on lyophilized peptide reconstitution (peptidefoundry.com/research/lyophilized-peptide-reconstitution/). That guide is handling literacy only; it does not set peptide-specific volumes, schedules, or human-use instructions. AA Water itself remains research-use only: not for human or veterinary use, not a drug or consumer finished good, and not a substitute for reading the peptide COA you are reconstituting.
How should AA Water be stored?
AA Water is supplied as a sterile liquid in a multi-dose glass vial.
Store sealed vials at room temperature (15–25 °C), away from direct light, and do not freeze.
Because the solution is unpreserved, use aseptic technique when withdrawing and discard unused solution rather than relying on a multi-use stability window. Discard if the liquid becomes cloudy, discolored, or shows visible particulates.
