The Blocking Solution Cat. No. #110

The most effective Blocker from CANDOR contains standardised and stabilised casein fragments as active blockers. Saturates free binding sites on plastic surfaces, membranes or other protein binding surfaces and thereby reducing high background in immunoassays.

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The Blocking Solution for ELISA, EIA, RIA, protein arrays, Western blotting, immuno-PCR and immunohistochemistry.

The most effective Blocker from CANDOR Bioscience

The Blocking Solution saturates free binding sites on plastic surfaces, membranes or other protein binding surfaces. The Blocking Solution prevents non-specific binding to surfaces.

By incubating the surface with The Blocking Solution (e.g. microtiter plate or western blotting membrane), free spaces on the surface are saturated by the components of The Blocking Solution. This minimizes unwanted binding of the analyte or the detection antibody to the surface and so background can be avoided and sensitivity of the assay can be improved.

The Blocking Solution is based on chemically modified and defined fragments of highly purified casein.

The Blocking Solution is not comparable to other commercially available or lab-made casein based solutions which are produced by just dissolving and filtrating of casein.

Benefits of The Blocking Solution

Generally speaking, the blocking effectiveness depends on different factors. The more effective the blocker, the more reliable are the results of the assays (even with different specimens). It is important to achieve complete saturation of the surface without any gaps. There should be no exchange reaction between molecules of the blocking layer and the sample matrix. In addition any interaction of molecules in the blocking layer with the sample matrix should also be prevented. A good blocker can fill even very small gaps and can minimize such interactions.

The Blocking Solution is the premium product of a new class of blockers developed by CANDOR Bioscience. These blockers carry chemical modifications which help to minimize interactions between the blocking layer and the sample matrix.

The Blocking Solution is based on highly purified casein which has been chemically modified. In addition the casein molecules were fragmented in an advanced production process. The specific procedure during fragmentation of the casein molecules results in a wide spectrum of variably sized casein fragments – reproducible from batch to batch.

Due to the variably sized casein fragments, the adsorption efficiency of classic protein-based blockers is combined with a blocking layer of small molecules and maximal density. The mixture of variably sized molecules ensures an extremely dense packing structure of the adsorptive blocking layer.

The chemical modification preserves these structures during the assay and minimizes the tendency to interactions. These advantages can be used without changing the blocking procedure. In many assays a reduction of incubation time for blocking can be realized by using The Blocking Solution.

The Blocking Solution is recommended for assays which require high reproducibility and low coefficients of variation. Examples are assays in medical and pharmaceutical research such as assays for pre-clinical and clinical studies, production of high quality diagnostics or measurement of precious specimens.

For research use only, not for diagnostic use.

Please note that the 1 L size will be packaged in 2x 500 ml bottles.

Download Product Resources

Product Descriptions & Guides
Product Inserts and Data Sheets

Brand CANDOR Bioscience
Code 110 125

Product Flyers and Application Guides

 BIOAXXESS CANDOR Blocker Selection Guide NEW
BIOAXXESS CANDOR Product Application Guide
 CANDOR Products Brochure
 Assay Defender® Flyer NEW
 Assay Defender® Use NEW
 Assay Defender® LowCross-Buffer® Comparison Matrix NEW
 SafetyTector™ S NEW

Product Inserts and Data Sheets

Assay Optimizers

 Assay Defender® NEW
 LowCross-Buffer® ​​​​​Mild
 LowCross-Buffer® Strong
 LowCross-Buffer® Animal-free/Protein-free
 LowCross-Buffer® ​​​​​Mild Animal-free/Protein-free
 LowCross-Buffer® ​​​​​Strong Animal-free/Protein-free
 LowCross® HRP-Stab
 LowCross® HRP-Stab Animal-free/Protein-free
 LowCross® HRP-Stab Mild Animal-free/Protein-free
 LowCross® HRP-Stab Strong Animal-free/Protein-free
 Sample Buffer
 Sample Buffer Animal-free/Protein-free
 Sample Buffer IHC

Covid-19 Inactivation and Dilution Buffer

 SafetyTector™ S NEW


 The Blocking Solution 
 PlateBlock™ NEW


 Antibody Stabilizer TRIS
 Antibody Stabilizer TRIS Animal-free/Protein-free
 Antibody Stabilizer PBS
 Antibody Stabilizer PBS Animal-free/Protein-free
 Liquid Plate Sealer®
 Liquid Plate Sealer® Animal-free
 HRP-Protector™ Animal-free/Protein-free
 HRP-Protector™ TRIS
 HRP-Protector™ TRIS Animal-free/Protein-free
 HRP-Protector™ PBS
 HRP-Protector™ PBS Animal-free/Protein-free

Standard Buffers (ready-made)

 Coating Buffer pH 7.4 
 Coating Buffer pH 9.6 
 Stripping Buffer 
 Washing Buffer ReadyTector®
 Washing Buffer TRIS
 Washing Buffer TRIS IHC
 Washing Buffer PBS 
 Washing Buffer PBS IHC

All-in-One Western Blotting Solution

 ReadyTector® Anti-Mouse
 ReadyTector® Anti-Rabbit

Tool boxes

 Blocking Sampler Package with BSA Block
 CANDOR Starter Package
 CANDOR Starter Package IHC


 Interference and HAMA problems
 IVD Technology Article
 Long-term stabilization of assay components
 Optimisation of assays: Interference in immunoassays recognize and avoid 
 SARS-CoV-2 antigen tests: safety for less than 5 cents per test 
 Specificity, positive predictive value and validation statistics in the context of CoViD-19
 The Appropriate Blocker — A Short Overview
 The right strategy saves much costs