Related Experiment Video

Updated: Aug 11, 2026

Qualitative and Quantitative Assays for Detection and Characterization of Protein Antimicrobials
10:50

Qualitative and Quantitative Assays for Detection and Characterization of Protein Antimicrobials

Published on: April 10, 2016

A simultaneous-coupling azo dye method for the quantitative assay of esterase using alpha-naphthyl acetate as

K J Johnston, A E Ashford

    The Histochemical Journal
    |March 1, 1980
    PubMed

    More Related Videos

    Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase11:01

    Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

    Published on: November 23, 2016

    Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis04:30

    Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis

    Published on: January 17, 2025

    Related Concept Videos

    Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

    Aryldiazonium Salts to Azo Dyes: Diazo Coupling

    The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
    Enzyme-Linked Immunosorbent Assay01:33

    Enzyme-Linked Immunosorbent Assay

    In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
    There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or quantified.