CANDOR Bioscience is Now Part of Medix Biochemica
About CANDOR Bioscience
In January 2025, Medix Biochemica acquired CANDOR Bioscience GmbH, a leading provider of immunoassay solutions based in Wangen, Germany. This acquisition strengthens Medix Biochemica’s IVD raw materials portfolio and enhances its support for immunoassay developers worldwide.
Founded in 2004, CANDOR Bioscience specializes in high-performance solutions for immunoassays, offering a comprehensive portfolio designed to improve test reliability and simplify assay development. Its product range includes HAMA and interference blockers, surface blockers, stabilizers and buffer solutions for immunoassays.

You can find all the same high quality CANDOR Bioscience products under Medix Biochemica's product portfolio.
Explore how CANDOR’s product portfolio enhances and complements Medix Biochemica’s offerings.
Benefits of using Premium Solutions for Immunoassay Blockers and Stabilizers
- Preventing interferences
- Avoiding false positives / false negatives
- Improved reliability of results
- Better stability of assay components
- Faster assay protocols

Blockers
HAMA and Interference Blockers
These sample and antibody diluents can reduce interferences in immunoassays caused by HAMA, rheumatoid factors, nonspecific binding, cross-reactivities and matrix effects. The use of these assay diluents can prevent false positive or false negative results and therefore improve the reliability of the results.
Assay Defender® | Sample diluent for blocking HAMA and other high affinity interfering antibodies. Minimizes nonspecific binding, cross-reactivities and matrix effects in immunoassays based on human or animal body fluids. |
LowCross-Buffer® |
Assay diluent for minimizing nonspecific binding, cross-reactivities and matrix effects in immunoassays. |
LowCross® HRP-Stab | Diluent for long-term storage of HRP conjugates and for minimizing nonspecific binding. |
Surface Blockers
The surfaces of ELISA plates or Western blotting membranes are optimized for efficient attachment of proteins and antibodies. This enables optimal assays with a high density of capture antibodies or capture molecules on the surfaces. As a consequence of this optimization of the surfaces, many other proteins or peptides and other molecules from the sample can attach on the surface, too. Without surface blocking, assay antibodies, tracers, analytes or other components of the sample would bind to the surface. This can lead to false results or high background signals and therefore it has to be prevented in order to get reliable assays. Blocking is necessary to saturate free binding capacities of the respective surfaces. This saturation can be achieved by covering the surface with a dense layer of molecules without gaps in this layer.
Medix Biochemica's CANDOR products offer surface blockers with different formulations and blocking characteristics. The Blocking Solution is a premium casein based blocker for routine applications as well as for challenging immunoassays. SmartBlock™ is a very efficient peptide based blocker. PlateBlock™ is an animal-free and protein-free surface blocker for ELISA plates specifically for serological assays (antigen-down-assays).
The Blocking Solution |
Casein based blocker for saturating free binding sites on plastic surfaces or other protein binding surfaces and for minimizing nonspecific binding to surfaces. |
SmartBlock™ | BSA-free blocker for saturating free binding sites on plastic surfaces or other protein binding surfaces. |
PlateBlock™ | Animal-free and protein-free blocker for plastic surfaces of ELISA plates specifically for serological assays (antigen-capture-assays). |
Stabilizers
Immunoassay stabilizers are needed to preserve the native conformation of proteins and to protect them from losing their functionality. Stabilizers for immunoassays allow long-term storage of antibodies, conjugates (e.g. HRP-labeled or AP-labeled) and antigens in solutions as well as coated onto surfaces like microtiter plates or others. Medix Biochemica's CANDOR products offer stabilizers to protect proteins, antibodies and conjugates in solution as well as stabilizers for antibodies coated on surfaces. The portfolio ranges from Liquid Plate Sealer® over HRP-Protector™, AP-Protector®, Antibody Stabilizer to LowCross® HRP-Stab.
To always get the same reliable results in immunoassays, it is essential to preserve standards for calibration curves, coated plates and antibodies during storage. Medix Biochemica's CANDOR stabilizers can be used for preserving activity of all biological components of an immunoassay. Medix Biochemica's CANDOR stabilizers are routinely used for production of commercial ELISA kits with shelf lives of 2 or more years.
Liquid Plate Sealer® | Stabilizer for coated antibodies and antigens on polystyrene- or glass-surfaces. |
HRP-Protector™ | Diluent for long-term storage of HRP conjugates. |
AP-Protector® | Diluent for long-term storage of alkaline phosphatase conjugates |
Antibody Stabilizer | Stabilizer for long-term storage of proteins/antibodies at 2-8°C. |
LowCross® HRP-Stab | Diluent for long-term storage of HRP conjugates and for minimizing nonspecific binding. |
Get in Touch Today
Reach out for any inquiries or support requests.
