Human Serum Proteins Conjugated to Agarose Beads, 5 mL – Catalog #B2025622

Human Serum Proteins Conjugated to Agarose Beads (Catalog #B2025622) harnesses the natural diversity of human serum proteins immobilized on agarose beads. This complex mixture—including human serum albumin, immunoglobulins (IgG, IgA, IgM), transferrin, fibrinogen, and other plasma proteins—provides a broad-spectrum affinity matrix for protein separation, antibody isolation, and studies of protein-protein interactions. Supplied as 5 mL of suspension, it is particularly useful for affinity chromatography applications where natural serum composition and multi-protein interactions are beneficial.

Scientific Overview

Human blood serum is a complex mixture of more than 4,000 distinct proteins with widely varying abundances, functions, and biochemical properties. The major components include human serum albumin (HSA, ~50% of total protein), immunoglobulins (IgG, IgA, IgM; ~20%), and numerous other plasma proteins such as transferrin, fibrinogen, complement components, protease inhibitors, and apolipoproteins. Each protein presents distinct binding sites, multiple domains, and diverse chemical functionalities.

When conjugated to agarose beads, human serum proteins create a multi-faceted affinity support that captures molecules and proteins through a combination of:

• Albumin's fatty acid and small-molecule binding sites
• Immunoglobulin-antigen interactions and antibody specificity
• Complement protein binding and immune complex formation
• General protein-protein interactions and adsorptive forces

Key applications include:

• Affinity chromatography using native serum protein interactions
• Antibody selection, enrichment, and purification from complex mixtures
• Serum protein-binding research and ligand screening
• Immunoaffinity separations leveraging natural antibody specificity

Usage & Handling Guidance

Store at 2–8°C. Allow beads to warm to room temperature before use. Mix gently to resuspend; do not vortex vigorously. Avoid repeated freeze–thaw cycles.

• Complex composition: These beads contain multiple protein components, each with distinct binding properties. Binding specificity depends on pH, ionic strength, temperature, and ligand chemistry. Optimize conditions for your specific application.
• Equilibration: Wash beads thoroughly with binding buffer before each use to remove contaminating proteins and ensure consistent performance.
• Binding: Incubate sample with beads at 4°C for enhanced specificity; room temperature allows faster kinetics.
• Elution: Use standard low-pH buffers (0.1 M glycine pH 2.5, 0.1 M citrate pH 3), high-salt solutions (3 M NaCl), or organic solvent gradients depending on your target molecule; immediately neutralize pH after acidic elution.
• Regeneration: Regenerate between cycles by washing with elution buffer and re-equilibrating with binding buffer.

What You Get

• 5 mL of human serum proteins conjugated to agarose beads, supplied as a suspension
• A complex, multi-protein affinity support reflecting natural serum composition
• Versatile chromatography substrate for diverse protein interactions
• For research use only (RUO)

Why Researchers Choose It

• Reflects natural serum protein composition for physiologically relevant separations
• Multiple binding sites and protein components enable diverse separation strategies
• Particularly suited to antibody and immune-complex isolation applications
• Cost-effective alternative to single-protein conjugates for exploratory chromatography

Frequently Asked Questions (FAQ)

• How does this differ from HSA-alone or IgG-alone agarose beads?
  These beads contain all major serum proteins, providing broader binding diversity and reflecting natural serum composition. Single-protein beads offer higher specificity for defined interactions.
• What is the protein composition of these beads?
  The complex includes albumin, immunoglobulins (IgG, IgA, IgM), transferrin, fibrinogen, complement components, and other plasma proteins present in human serum. Precise composition varies by batch; request a COA/TDS for details.
• How should I optimize binding conditions for my specific application?
  Start with standard immunoaffinity chromatography conditions (neutral pH, low salt) and vary pH and ionic strength to identify the optimal selectivity for your target molecule.
• Can I achieve high specificity with a multi-protein support?
  Yes, if your target molecule has defined affinity for one or more of the serum proteins. Specificity is then determined by the specific protein interaction, not the overall support.
• Are lot-to-lot variations expected?
  As a natural-product-derived reagent, some variation in composition and performance between lots is possible. Request comparative COA/TDS data if consistency is critical for your application.

References

• Park J, Kim MS, Park T, Kim YH, Shin DH. Crystal structure of pharmaceutical-grade human serum albumin. Int J Biol Macromol. 2021;166:221-228.
• Salehi N, Peng CA. Purification of CD47-streptavidin fusion protein from bacterial lysate using biotin-agarose affinity chromatography. Biotechnol Prog. 2016;32(4):949-58.
• Grodzki AC, Berenstein E. Antibody purification: affinity chromatography - protein A and protein G Sepharose. Methods Mol Biol. 2010;588:33-41.