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Pre-coupled Magnetic Beads for RDC Immunoreactive Fraction (IRF) Analysis

The Immunoreactive Fraction (IRF) is a critical functional quality attribute used to assess the antigen-binding activity of radiolabeled Radionuclide Drug Conjugates (RDCs). It is widely applied throughout RDC development, from process optimization to CMC quality control and batch release testing.
ACROBiosystems Pre-coupled Magnetic Beads provide a rapid, standardized, cell-free workflow for RDC IRF analysis.

Challenges in Conventional IRF Analysis

The Lindmo assay remains a widely used reference method for IRF analysis. However, its cell-based workflow presents challenges in efficiency, reproducibility, and standardization during RDC development and CMC.
  • ● Time-consuming 5–9 h per assay limits rapid IRF evaluation.
  • ● Cell Culture Dependent Variations in cell status and target expression can affect assay performance.
  • ● Limited Standardization Cell-based systems can reduce assay reproducibility and consistency.
  • ● Safety Concerns Longer workflows increase radioactive handling time during experiments.
To improve assay efficiency and consistency, cell-free IRF analysis using pre-coupled magnetic beads offers a complementary approach for RDC functional evaluation.

ACROBiosystems Pre-coupled Magnetic Beads for Cell-free RDC IRF Analysis

ACROBiosystems Pre-coupled Magnetic Beads provide a ready-to-use, cell-free workflow for RDC IRF analysis. Biotinylated recombinant target proteins are pre-immobilized on superparamagnetic magnetic beads, eliminating protein coupling and assay development steps while enabling direct IRF evaluation.
Why Choose ACROBiosystems?
Ready-to-Use

Ready-to-Use

Complete cell-free IRF analysis in 20–40 minutes using pre-coupled magnetic beads, eliminating in-house bead preparation while reducing assay variability.

Reliable Performance

Reliable Performance

Features uniform superparamagnetic beads delivering ≥98% specicity and excellent batch-to-batch consistency

Consistent with Cell-based Assays

Consistent with Cell-based Assays

Customer validation confirmed consistent IRF results

Long-Term Stability

Long-Term Stability

Lyophilized beads remain stable for 2 years at −80°C and maintain performance after multiple freeze–thaw cycles.

Traditional Cell-Based vs. ACROBiosystems Cell-Free Bead-Based Workflow
The cell-free bead-based method is not intended to replace the Lindmo cell-based assay, but rather to provide a faster, more easily standardized complementary approach for IRF detection in R&D and CMC settings.
Traditional Cell-Based vs. ACROBiosystems Cell-Free Bead-Based Workflow Traditional Cell-Based vs. ACROBiosystems Cell-Free Bead-Based Workflow
Rapid, Cell-Free IRF Analysis in 5 Simple Steps
Measure Input

Measure Input

Record the total radioactivity of the RDC sample.

Capture

Capture

Add the RDC sample to antigen-conjugated magnetic beads.

Incubate

Incubate

Incubate at room temperature with continuous mixing.

Separate & Wash

Separate & Wash

Magnetically separate and wash away unbound RDC.

Count & Calculate IRF

Count & Calculate IRF

Measure bead-bound radioactivity and determine IRF.

Pre-coupled Magnetic Beads Covering Popular RDC Targets

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Custom Bead Development Services

Need a Target Beyond Our Standard Portfolio?
Custom Pre-coupled Magnetic Bead Development is available to support your RDC IRF assay development.

Consult Custom Development Service
Proven Stability for Reliable IRF Analysis
Proven Stability for Reliable IRF Analysis

Accelerated stability test. After placing the lyophilized beads at 37°C for 7 days, binding activity between the Human TROP-2-coupled Magnetic Beads (Cat.No. MBS-K028) and anti-trop-2 mAb showed little deviation from the unaccelerated sample (%RSD<10%). Data were measured on day 0, 3, 7 respectively.

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Related Products

References

1. Delaney S, et al. Molecular Imaging and Biology. 2024;26:213–221.

2. Sharma SK, et al. Nuclear Medicine and Biology. 2019;71:32–38.

3. ACROBiosystems Internal Data, 2026.

  • Background
  • Challenges in Conventional IRF Analysis
  • ACROBiosystems Pre-coupled Magnetic Beads for Cell-free RDC IRF Analysis
  • Pre-coupled Magnetic Beads Covering Popular RDC Targets
  • Custom Bead Development Services
  • Related Products
  • References
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