Phosphate Buffered Saline (PBS) is a sterile saline solution formulated to maintain a stable, physiological pH during laboratory procedures.

While bacteriostatic water is the preferred solvent for most lyophilised peptides, some peptides dissolve more readily or remain more stable in a buffered environment. PBS provides that environment by combining purified water, salts and a phosphate buffer to closely resemble physiological conditions. For this reason, phosphate buffered saline is widely used for peptide reconstitution, biological assays and general laboratory research.

Why use Phosphate Buffered Saline?

PBS is commonly selected when a peptide benefits from a buffered solution rather than plain water.

Researchers use phosphate buffered saline because it:

maintains a stable physiological pH
provides a buffered saline environment
can improve dissolution of selected peptides
is suitable for many biological laboratory procedures
is supplied sterile and ready to use

When is PBS preferred over BAC Water?

Bacteriostatic Water remains the preferred reconstitution solution for most research peptides.

However, some peptides may dissolve more efficiently or produce a clearer solution when reconstituted in phosphate buffered saline.

For example, ARA-290 (Cibinetide) is widely reported by researchers to dissolve more readily in buffered saline than in bacteriostatic water, making PBS a practical alternative for this peptide.

The choice of reconstitution solution ultimately depends on the specific peptide and research protocol.

PBS vs BAC Water

Although both products are used for peptide reconstitution, they serve different purposes.

Phosphate Buffered Saline

buffered to maintain physiological pH
contains no bacteriostatic preservative
suitable for peptides that benefit from buffered conditions
commonly used in biological research

Bacteriostatic Water

contains 0.9% benzyl alcohol
designed for multi-dose use
suitable for most research peptides
the standard choice for routine peptide reconstitution

Compatible research applications

Phosphate buffered saline is commonly used for:

peptide reconstitution
preparation of laboratory solutions
biological assays
washing procedures
dilution of biological samples
research requiring physiological pH

Handling and storage

For best laboratory practice:

use sterile syringes and needles
avoid repeated contamination
keep the vial tightly sealed when not in use
discard if sterility is compromised

Because phosphate buffered saline contains no bacteriostatic preservative, proper aseptic handling is especially important after opening.

Product characteristics

Sterile laboratory-grade solution
Appearance: clear, colorless liquid
Composition: phosphate-buffered saline (without Ca²⁺ and Mg²⁺)
pH: ~7.2–7.4 at 25°C
Storage: store at 2–25°C. Keep container sealed to maintain sterility.

Frequently Asked Questions

What is phosphate buffered saline?

Phosphate buffered saline (PBS) is a sterile buffered saline solution that maintains a stable physiological pH during peptide reconstitution and laboratory research.

Why use PBS instead of bacteriostatic water?

While bacteriostatic water is suitable for most peptides, some peptides dissolve more readily or perform better in a buffered environment. PBS provides stable pH conditions that may improve reconstitution for selected compounds.

Which peptides are commonly reconstituted with PBS?

Most peptides can be reconstituted with bacteriostatic water, but peptides such as ARA-290 are frequently reported by researchers to dissolve more effectively in phosphate buffered saline.

Does PBS contain a preservative?

No. Unlike bacteriostatic water, phosphate buffered saline contains no bacteriostatic preservative, so sterile handling after opening is essential.

Can PBS be used for all peptides?

PBS is compatible with many peptides and laboratory applications, but bacteriostatic water remains the preferred choice for most products. Researchers should select the solvent best suited to the peptide being investigated.

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 – the standard reconstitution solution for most peptides.
ARA-290 (Cibinetide) – commonly reconstituted using buffered saline.
0.22 μm PES Sterile Filters – sterile filtration for laboratory solutions.
Peptide Reconstitution Guide – learn how to prepare lyophilised peptides correctly.

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

Disclaimer
This product is intended strictly for research and laboratory use only. It is not approved for human consumption, medical, or veterinary use.

ARA-290

Phosphate Buffered Saline / 5 ml