Identify the chemicals represented by this artist’s conception of an antibody sandwich ELISA.

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Step 1: Identify the component labeled 'a'. This is the solid surface or well where the assay takes place, typically a microtiter plate well coated with a capture antibody.

Step 2: Identify the component labeled 'b'. This is the capture antibody that is immobilized on the solid surface and is specific to the antigen of interest.

Step 3: Identify the component labeled 'c'. This is the antigen that binds specifically to the capture antibody, forming the first part of the 'sandwich'.

Step 4: Identify the component labeled 'd'. This is the detection antibody, which binds to a different epitope on the antigen, allowing for specific detection.

Step 5: Identify the components labeled 'e' and 'f'. 'e' is the enzyme conjugated to the detection antibody, which catalyzes a colorimetric or other detectable reaction, and 'f' is the substrate that the enzyme acts upon to produce a measurable signal.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Capture Antibody

The capture antibody is immobilized on the surface of the well and specifically binds to the target antigen. It serves as the first layer in the sandwich ELISA, ensuring that only the antigen of interest is retained for detection.

Antigen

The antigen is the molecule of interest that is specifically recognized and bound by both the capture and detection antibodies. It is 'sandwiched' between these antibodies, allowing for its identification and quantification.

Detection Antibody and Enzyme Label

The detection antibody binds to a different epitope on the antigen and is linked to an enzyme (such as horseradish peroxidase). This enzyme catalyzes a colorimetric reaction when substrate is added, producing a measurable signal proportional to antigen concentration.

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