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Silver sol immunoagglutination assay for determination of human IgG

Vardan K Gasparyan1

  • 1Institute of Biochemistry, National Academy of Sciences, PSevak str 5/1, Yerevan 0014, Republic of Armenia. vgasparyan@excite.com

Colloids and Surfaces. B, Biointerfaces
|July 6, 2010
PubMed

Immunoagglutination properties of silver nanoparticles sensitized with antibodies to human IgG for determination of IgG were studied. Effects of various pH on sensitization and consequent immunoagglutination process were investigated. It was shown that the best results were obtained when sensitization and immunoagglutination were conducted at isoelectric point of IgG molecule. It was demonstrated that immunoassay with colloidal silver nanoparticles provides the detection of antigen in wide range of concentrations.

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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.