Acetic Acid Water 10ml
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About Acetic Acid Water 10ml
Acetic acid water (0.1% v/v, pH approximately 3.5-4.0) is an alternative reconstitution medium for research peptides that are poorly soluble in neutral aqueous solutions. At physiological pH, many cationic peptides — particularly those rich in arginine and lysine — form aggregates through intermolecular electrostatic and hydrophobic interactions. Lowering pH to around 3.5 protonates more amino groups, increases electrostatic repulsion between peptide chains, and disrupts aggregation, producing a clear, stable solution that can then be diluted into higher-pH buffers for experimental use.
When to Use Acetic Acid Water
Growth hormone peptides (GH 191AA, GH Fragment 176-191), IGF-1 variants, and some neuropeptides are the most common candidates. The protocol is typically: dissolve in 0.1% acetic acid first to produce a concentrated stock, then dilute 10-fold or more into PBS, saline, or media for the working solution. At a 1:10 dilution, the acetic acid concentration in the experimental solution drops to 0.01%, which is tolerable for most in vitro and in vivo applications without pH disruption.
Do not use acetic acid reconstitution for peptides with acid-sensitive bonds — aspartyl-proline sequences and some modified peptides can undergo acid hydrolysis. Also avoid for experiments where a precisely controlled pH is critical to the readout. For standard peptide solubilization where your primary concern is getting the compound into solution, 0.1% acetic acid is a well-established approach that the peptide research community has used for decades.
Specifications
| Parameter | Value |
|---|---|
| Volume | 10ml vial |
| Acetic acid concentration | 0.1% v/v |
| pH | approximately 3.5 – 4.0 |
| Sterility | Sterile filtered |
| Solvent | Water for injection grade |
Storage
Store at room temperature, away from heat sources and direct sunlight. Acetic acid water does not require refrigeration before opening. Once opened and added to a peptide vial, store reconstituted solution at 4°C and use within 7 days — acetic acid water lacks the benzyl alcohol preservative of bacteriostatic water, so the stability window is shorter. For longer storage of acetic acid-solubilized peptides, lyophilize aliquots after initial reconstitution.
Which peptides specifically require acetic acid water for reconstitution?
GH 191AA and GH Fragment 176-191 are the most commonly cited examples. IGF-1 LR3 can sometimes be dissolved in neutral buffer but acetic acid often produces better initial solubility. GHRP-2 and GHRP-6 typically dissolve readily in bacteriostatic water. When in doubt, try bacteriostatic water first — if the solution remains cloudy after gentle agitation for 5 minutes, switch to 0.1% acetic acid. Some researchers routinely use acetic acid for all GH-axis peptides simply to avoid troubleshooting aggregation at inconvenient times.
Does the acidic pH affect peptide stability?
For most synthetic peptides, mild acidity (pH 3.5-4.0) is actually stabilizing compared to neutral pH — it reduces deamidation of asparagine and glutamine, which are hydrolysis-susceptible amino acids that preferentially degrade at neutral to basic pH. The concern is that strongly acidic conditions (below pH 2) can cleave Asp-Pro bonds in certain peptide sequences. At 0.1% acetic acid and pH approximately 3.5, this is not a concern for standard research peptides. The bigger stability risk at acidic pH is oxidation of methionine and tryptophan if oxygen is not excluded during storage.
Acetic acid water is supplied for laboratory research use only. For research purposes only.
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