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

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.

Acetic acid water is supplied for laboratory research use only. For research purposes only.