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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

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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...
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Immunogold Electron Microscopy01:20

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Capillary Electrophoresis: Instrumentation01:20

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Updated: Apr 26, 2026

ELIME Enzyme Linked Immuno Magnetic Electrochemical Method for Mycotoxin Detection
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ELIME Enzyme Linked Immuno Magnetic Electrochemical Method for Mycotoxin Detection

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Electrochemical immunoassays.

A Warsinke1, A Benkert, F W Scheller

  • 1University of Potsdam, Institute of Biochemistry and Molecular Physiology, Luckenwalde, Germany. warsinke@rz.uni-potsdam.de

Fresenius' Journal of Analytical Chemistry
|February 28, 2001
PubMed
Summary
This summary is machine-generated.

Electrochemical immunoassays offer a promising alternative for point-of-care diagnostics, especially for complex samples. This review highlights amperometric methods and discusses a novel approach for creatinine detection.

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Clinical Diagnostics

Background:

  • Immunoassays (IA) leverage specific antigen-antibody interactions for analysis.
  • Established methods like Radioimmunoassays (RIA), fluorescence immunoassays (FIA), and enzyme immunoassays (EIA) are common in diagnostics.
  • Electrochemical immunoassays are emerging as viable alternatives for point-of-care (POC) devices, particularly for optically challenging samples.

Purpose of the Study:

  • To provide an overview of electrochemical immunoassay principles.
  • To explore the potential of amperometric transducers for sensitive and rapid detection.
  • To discuss an indirect competitive electrochemical immunoassay for nanomolar creatinine determination and address sensor regeneration challenges.

Main Methods:

  • Review of established and emerging electrochemical immunoassay techniques.
  • Focus on potentiometric, capacitive, and amperometric transducers.
  • Discussion of competitive and noncompetitive assay formats using redox or enzyme labels.

Main Results:

  • Amperometric transducers are preferred for electrochemical immunoassays due to fast detection, wide linear range, and low detection limits.
  • Electrochemical methods offer advantages over optical methods for opaque or optically dense matrices.
  • An indirect competitive electrochemical immunoassay shows potential for nanomolar creatinine determination.

Conclusions:

  • Electrochemical immunoassays, particularly amperometric ones, are highly promising for developing advanced point-of-care diagnostic devices.
  • These methods offer superior performance for specific analytes and complex sample types.
  • Addressing challenges like sensor regeneration is key to the widespread adoption of electrochemical immunoassays.