Polysucrose™ 400

Polysucrose™ 400

Polysucrose™ 400 is a high-molecular-weight synthetic polysaccharide widely used in biochemistry, immunology, and cell separation techniques. It plays an important role in density gradient media formulations and is frequently used as a stabilizing component in protein solutions and diagnostic assays.

Developed and commercialized by Axis-Shield, Polysucrose™ 400 is best known for its role in density gradient reagents used for blood cell isolation and purification of biological materials.

What Is Polysucrose™ 400?

Polysucrose™ 400 is a highly branched, water-soluble polymer of sucrose with an average molecular weight of approximately 400,000 Daltons. Because of its large molecular structure and neutral charge, it is biologically inert and non-toxic, making it ideal for biological applications.

Key characteristics include:

  • Highly water soluble

  • Non-ionic and chemically inert

  • High molecular weight (~400 kDa)

  • Low osmotic pressure

  • Stable in aqueous solutions

These properties make Polysucrose™ 400 particularly suitable for density gradient centrifugation and protein stabilization.

Role in Density Gradient Media

Polysucrose™ 400 is commonly used as a component of density gradient media for cell separation. In many gradient formulations, it is combined with other compounds to create solutions with carefully controlled density and osmotic conditions.

In these systems, Polysucrose™ 400 contributes to:

  • Formation of stable density gradients

  • Maintenance of physiological osmotic conditions

  • Gentle separation of biological particles

Because of its high molecular weight and low permeability, it does not easily penetrate biological membranes, which helps protect cells during centrifugation.

Use as a Protein Stabilizing Agent

Polysucrose™ 400 can also function as a stabilizing agent in protein solutions. Its polymeric structure helps maintain protein integrity by reducing aggregation and protecting proteins from physical stress.

Common uses include:

  • Stabilization of enzyme preparations

  • Protection of antibodies in solution

  • Storage of sensitive biological proteins

By stabilizing protein conformation, Polysucrose™ 400 improves the shelf life and performance of biochemical reagents.

Immunologically Inert Carrier

Another important application of Polysucrose™ 400 is its use as an immunologically inert carrier molecule. Because it does not typically trigger immune responses, it can safely transport or stabilize low molecular weight compounds in biological systems.

This property is useful in:

  • Immunological assays

  • Diagnostic reagent formulations

  • Vaccine and antigen research

Its inert nature ensures that experimental results are not affected by unintended immune activation.

Applications in Life Science Research

Polysucrose™ 400 is widely used in many areas of biological and biomedical research.

Cell Biology

  • Density gradient centrifugation

  • Isolation of lymphocytes and mononuclear cells

  • Preparation of cell culture reagents

Immunology

  • Stabilization of antibodies

  • Carrier molecule in immunoassays

Biochemistry

  • Protein stabilization

  • Buffer formulation for sensitive biomolecules

Clinical and Diagnostic Research

  • Preparation of diagnostic reagents

  • Cell separation for laboratory testing

These applications highlight the versatility of Polysucrose™ 400 in laboratory workflows.

Advantages of Polysucrose™ 400

Researchers choose Polysucrose™ 400 for several reasons:

  • Biologically inert and non-toxic

  • Compatible with many biological systems

  • Stable under laboratory conditions

  • Suitable for delicate proteins and cells

  • Reliable performance in gradient systems

These advantages make it a valuable reagent for both research and diagnostic laboratories.

Conclusion

Polysucrose™ 400 is a versatile polymer widely used in density gradient media, protein stabilization, and immunological research. Its high molecular weight, chemical stability, and immunological inertness allow it to support a wide range of laboratory applications while preserving the integrity of biological materials.

As modern life science research continues to advance, Polysucrose™ 400 remains an essential component in many biochemical and cell separation technologies.