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ELISA technical guide and protocols

TECH TIP # 65 ELISA technical guide and protocols Table of Contents Introduction ..2 Variations between ELISA protocols ..3 A. Antigen B. Direct vs. Indirect Detection of C. Biotin Signal amplification ..3 D. Fluorescence ..4 E. Enzymatic Detection ..4 F. Substrates ..4 Factors affecting assembly of the immune A. Types of Plate and Coupling Options ..5 B. Antibodies ..6 C. Blocking Buffer ..6 D. Target E. Enzyme Conjugate ..7 F. Washing the Plate ..7 G. Substrates and Signal Detection ..7 Common Occurrences and Explanations ..7 A. Low Signal-to-Noise B.

Signal amplification occurs through two mechanisms with these approaches. First, biotinylation (biotin-labeling) typically results in multiple biotin tags per antibody molecule, thus allowing more than one streptavidin molecule to bind to each antibody.

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