Acetic Acid 2% is a dilute acidic solution used as a specialist reconstitution solvent in peptide research.

While bacteriostatic water and phosphate buffered saline are suitable for most peptides, some sequences may remain cloudy, aggregate or dissolve incompletely under neutral conditions. In these cases, a mildly acidic environment can improve peptide solubility and produce a clearer solution. Acetic acid is therefore used as a technical solubility aid, rather than a universal peptide solvent.

Why use Acetic Acid?

Researchers may choose acetic acid when a peptide:

dissolves poorly in bacteriostatic water
forms visible aggregates or particles
remains cloudy after reconstitution
requires mildly acidic conditions for improved solubility
is known to perform better in acidic solutions

When is Acetic Acid preferred?

Most research peptides reconstitute readily in bacteriostatic water or phosphate buffered saline. Acetic acid is generally reserved for selected peptides that are difficult to dissolve in neutral solutions. Examples commonly discussed in peptide research include:

IGF-1 LR3
IGF-1 DES
PEG-MGF
selected hydrophobic or aggregation-prone peptide sequences

Depending on the specific peptide, researchers may use acetic acid as the primary solvent or as an initial dissolution step before further dilution into another compatible solution.

Acetic Acid vs BAC Water vs PBS

Each solvent has a different role in peptide research.

Acetic Acid

mildly acidic solution
improves solubility of selected peptides
specialist solvent
not required for most peptides

Bacteriostatic Water

standard solvent for most peptides
contains 0.9% benzyl alcohol
suitable for multi-dose use

Phosphate Buffered Saline

maintains physiological pH
useful for peptides that benefit from buffered conditions
commonly used for biological laboratory work

Choosing the appropriate solvent depends on the peptide’s individual solubility characteristics rather than a single universal rule.

Handling and storage

For best laboratory practice:

use sterile syringes and needles
avoid contamination after opening
refrigerate after opening when appropriate
use only clean laboratory equipment
keep the container tightly sealed

Product characteristics

Purity: laboratory grade aqueous solution
Appearance: clear, colorless liquid
Composition: 2% acetic acid in water
Molecular formula (acetic acid): C₂H₄O₂
Molecular weight (acetic acid): ~60.05 g/mol
Storage: store at controlled room temperature (20–25°C), tightly sealed

Frequently Asked Questions

What is Acetic Acid used for?

Acetic acid is used as a specialist reconstitution solvent for peptides that dissolve poorly in neutral solutions such as bacteriostatic water.

Do all peptides require Acetic Acid?

No. Most peptides dissolve readily in bacteriostatic water or phosphate buffered saline. Acetic acid is intended only for peptides that benefit from mildly acidic conditions.

Which peptides commonly use Acetic Acid?

Depending on the manufacturer and formulation, peptides such as IGF-1 LR3, IGF-1 DES, PEG-MGF and certain hydrophobic research peptides are commonly reconstituted using dilute acetic acid.

Can Acetic Acid improve peptide solubility?

Yes. Lowering the pH can change peptide charge characteristics and reduce aggregation, allowing some difficult peptides to dissolve more readily.

Should Acetic Acid be used for every peptide?

No. It should only be used when appropriate for the peptide being investigated. Using an acidic solvent when it is unnecessary provides no advantage and may not be suitable for every sequence.

Is this product intended for human use?

No. This product is supplied exclusively for laboratory and analytical research. It is not intended for human consumption, diagnosis, treatment or prevention of disease.

Related research products

Bacteriostatic Water – standard reconstitution solution for most peptides.
Phosphate Buffered Saline – buffered alternative for selected peptides.
0.22 μm PES Syringe Filters – sterile filtration of laboratory solutions.
Peptide Reconstitution Guide – learn how to select the correct solvent for different peptides.

NOTE

This is for educational reference only and does not constitute medical advice.

Disclaimer

This product is sold for research purposes only. It is not intended to diagnose, treat, cure, or prevent any disease. Buyer assumes full responsibility for proper handling and use.

solvent acid

Acid acetic 2%