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Competition Rapid Equilibrium Dialysis (RED) Devices

A transforming technology for plasma protein-binding assays.

Competition RED Device Inserts and Base Plates

Thermo Scientific Pierce Competition RED Device Inserts and Base Plates comprise a specially designed system for evaluating competitive binding interactions using rapid equilibrium dialysis (RED).

The Competition RED Device was developed in association with pharmaceutical laboratories to more accurately model in vivo drug interactions by enabling equilibrium dialysis experiments to be performed in a multiplexed format involving competition for binding among different tissues. The Competition RED Device System consists of disposable dialysis tube inserts and a reusable Base Plate made of high-grade PTFE. The Base Plate is much like our regular RED Device Plate except that it is divided into different size chambers (wells) for positioning 2-8 RED Device Inserts per well. The format enables competitive dialysis experiments involving 2-15 separate tissue or protein fluid samples. Each Competition RED Insert contains either one or two separate dialysis chambers (each package includes a selection of both types). The Competition RED Device requires no extensive assembly or specialized equipment, and each chamber/well is easily accessible from the top of the device.


  • Easy to use – disposable tubes require no presoaking step, assembly, or specialized equipment
  • Short incubation time – design provides high surface-to-volume ratio of membrane to sample, enabling equilibrium to be reached within 2-4 hours
  • Flexible format – base plate contains several different chamber sizes, enabling small molecule partitioning studies involving 2-16 tissue or protein samples without waste
  • Robust – compartmentalized design eliminates potential for cross talk or leakage
  • Reproducible and accurate – perform controlled experiments with multiple tissues to obtain screening results that have high predictability for in vivo studies with animal models
  • Validated quality – base plate is composed of chemically inert high-grade PTFE, eliminating non-specific binding and risk of contamination; each lot is functionally tested in a protein binding assay for guaranteed performance


  • ADME-Tox studies: in vitro screening of drug partitioning between plasma and multiple tissues before in vivo studies with animal models
  • Aids in determining formulation of drug dosage for in vivo studies
  • Drug-drug interaction studies
  • Competitive binding and dissociation constant determination for small molecules versus multiple targets

Product Details:

Diagram of the Competition RED Device Base Plate, which allows for competitive dialysis experiments to assess drug binding interactions.
Format of the Thermo Scientific Competition RED Device Base Plate. The Base Plate body (center) has different well sizes for holding 4, 6, 8 or 16 dialysis chambers (2, 3, 4 or 8 inserts, respectively). The different wells allow a choice of the size best suited for the specific experimental design. The lid (left) snaps onto the Base Plate and holds and suspends the dialysis chambers in the wells.The device requires no extensive assembly steps or specialized equipment, and each chamber/well is easily accessible from the top of the device. The base plate has a standard 96-well plate footprint with 9 x 9 mm well spacing. The Competition RED Device Inserts (pictured above) are offered with the molecular weight cutoff (MWCO) of 12,000Da.


Sample volume required for each Base Plate well size. Add 0.5mL to each insert slot that is not filled.
Base Plate Well Number of Inserts Total Volume
4-compartment 2 inserts 1.5mL
6-compartment 3 inserts 2.5mL
8-compartment 4 inserts 3.0mL
16-compartment 8 inserts 5.0mL

Determining the extent to which a molecule partitions between plasma and specific tissues in the body is a critical phase of drug development because it determines compound dosing, efficacy, clearance rate, and the potential for drug interactions or tissue damage. Although final assessment of these variables invariably requires animal dosing and analysis, in vitro screening systems that are rapid and have good predictability are highly desirable for ADME-Tox studies. Equilibrium dialysis is among the most successful of in vitro screening method for evaluating drug binding and dosage requirements. Equilibrium dialysis is used to estimate the non-bound drug fraction in plasma or drug partitioning between red blood cell and plasma, plasma and liver microsomes, or plasma and tissue homogenates. However, many tissue-partitioning studies indicate that certain drugs show significant binding to tissues tested individually but have considerably different binding preferences when placed in competition between multiple tissues. The Competition RED Device extends the power of equilibrium dialysis by facilitating analysis of simultaneous drug interactions and partitioning among multiple tissues.

Competition equilibrium dialysis experiment example. Example device setup and experiment. This setup uses a 6-compartment well of the base plate, two dual-chamber inserts (top and bottom) and one single-chamber insert (middle position). Each 10-pack of Competition RED Inserts contains eight dual-chamber inserts and two single-chamber inserts. The open chamber in the single-chamber inserts enables direct access to the sample in the base plate well without disassembling the device. This example experiment monitors drug partitioning among buffer, plasma, heart, liver, kidney and brain tissue extracts. The buffer chamber is for determining the amount of unbound drug.


Related Products:

Other Rapid Equilibrium Dialysis (RED) Products and Accessories
RED Device Inserts (single chamber)
Pierce Protein Precipitation Plates
Sealing Tape for Microplates
Phosphate Buffered Saline
LC/MS Grade Acetonitrile
Trifluoroacetic Acid

Ordering Information
Product # Description Pkg. Size Instructions MSDS CofA Price
90085 Competition RED Base Plate
Formulation: Contains base plate body and lid
1 unit Certificate of Analysis for product #90085 Competition RED Base Plate $606.00

Now available on lifetechnologies.com
90087 Competition RED Inserts
Formulation: Contains 8 dual-membrane inserts and 2 single-membrane inserts
10 pack Product Instructions for product #90087 Competition RED Inserts Certificate of Analysis for product #90087 Competition RED Inserts $156.00

Now available on lifetechnologies.com
90088 Competition RED Inserts
Formulation: Contains 40 dual-membrane inserts and 10 single-membrane inserts
50 pack Product Instructions for product #90088 Competition RED Inserts Certificate of Analysis for product #90088 Competition RED Inserts $677.00

Now available on lifetechnologies.com

Instructions | MSDS | CofA
Product Instructions | MSDS | CofA  

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