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Related Concept Videos

Immunoprecipitation01:20

Immunoprecipitation

Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
Precipitation Titration: Overview01:26

Precipitation Titration: Overview

Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Antibody Actions01:26

Antibody Actions

Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Updated: Jun 19, 2026

Particle Agglutination Method for Poliovirus Identification
07:06

Particle Agglutination Method for Poliovirus Identification

Published on: April 20, 2011

AGGLUTINATION BY PRECIPITIN.

F S Jones1

  • 1Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Heating serum enhances its reaction with specific precipitins due to coagulated protein coating. This principle improves antigen-antibody reaction visibility using particles like bacteria or collodion.

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Determining the Reactivity and Titre of Serum using a Haemagglutination Assay
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Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

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Co-immunoprecipitation of the Mouse Mx1 Protein with the Influenza A Virus Nucleoprotein

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Last Updated: Jun 19, 2026

Particle Agglutination Method for Poliovirus Identification
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Determining the Reactivity and Titre of Serum using a Haemagglutination Assay
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Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

Published on: January 29, 2010

Co-immunoprecipitation of the Mouse Mx1 Protein with the Influenza A Virus Nucleoprotein
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Co-immunoprecipitation of the Mouse Mx1 Protein with the Influenza A Virus Nucleoprotein

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Area of Science:

  • Immunology
  • Biochemistry

Background:

  • Serum proteins can undergo denaturation upon heating.
  • Antigen-antibody reactions are fundamental in immunology.

Purpose of the Study:

  • To investigate the effect of heat-induced protein coagulation on antigen-antibody reactions.
  • To explore methods for enhancing the visibility of precipitation reactions.

Main Methods:

  • Heating serum to induce clouding and testing its reactivity with specific precipitins.
  • Utilizing bacteria and collodion particles as carriers for antigens.
  • Sensitizing particles with antigens (serum, egg albumin) and testing for agglutination with specific antisera after washing.

Main Results:

  • Heat-treated serum showed a more intense reaction with precipitins compared to unheated or partially heated serum.
  • Coagulated protein particles, when coated with undenatured antigen, facilitated agglutination upon precipitin addition.
  • Sensitized collodion particles and bacteria agglutinated with specific precipitins even after thorough washing, indicating retained antigen.

Conclusions:

  • Heat-induced coagulation of serum proteins enhances antigen-antibody reactions by providing a substrate for antigen adherence.
  • The use of particulate matter (bacteria, collodion) can amplify and visualize antigen-antibody interactions.
  • This phenomenon has implications for diagnostic assays requiring sensitive detection of antigens or antibodies.