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Biotin Overview

Rockland offers biotin coupled to enzymes and secondary antibodies for use in biotin-avidin systems commonly used in immunoassays like ELISA, western blotting and immunohistochemistry.  The use of biotin and avidin or streptavidin results in signal amplification.  Biotin-avidin bridging is a convenient way to link molecules such as antibodies and reporter labels such as fluorescent dyes or enzymes commonly used in biotechnology.


 Biotin Glucose Oxidase Conjugate

 Biotin Beta Galactosidase Conjugate

 Biotin Peroxidase Conjugate

Biotin Glucose Oxidase Conjugate


Biotin Beta Galactosidase Conjugate


Biotin Peroxidase Conjugate



View All Biotin Conjugates



Recommended Products by Application


Biotin Peroxidase Conjugate for western blotting
Biotin Alkaline Phosphatase Conjugate for Immunohistochemistry
Biotin Beta Galactosidase Conjugate for molecular biology  
Biotin Glucose Oxidase Conjugate for ELISA


Biotin Conjugates used with Avidin or Streptavidin for Maximum Signal Enhancement:

While the basic configuration of biotin and streptavidin results in signal amplification, the incorporation of free avidin or streptavidin with biotinylated label forms a polymeric complex that results in significantly greater sensitivity in many immunoassays.  The user must determine empirically the amounts of reagents to combine for optimal signal strength.  The diagram below illustrates shows this effect.


Biotin Conjugates used with Avidin or Streptavidin for Maximum Signal Enhancement



The target (T) is bound to a solid phase, i.e. ELISA plates, agarose beads, tissue sections.  The binder (Ab) in this example is an antibody, but can be proteins, carbohydrates, nucleic acids or analytes.  The binder is biotinylated (B) randomly at multiple sites.   Unlabeled streptavidin (S) binds both to the biotinylated binder AND to the label (L) i.e. an enzyme, fluorochrome, nucleic acid, or analyte, which also contains multiple biotin moieties.  This effect results in an extended polymeric structure that maximizes sensitivity in many assays. 


For custom biotin conjugates, click here.


Avidin Streptavidin Biotin



Reference Rockland Bucket



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