Homogeneous Potentiometric Enzyme Immunoassay for Human Immunoglobulin G

Tekum Fonong, G. A. Rechnitz

Research output: Contribution to journalArticle


Human IgG Is determined In a homogeneous Immunoassay method which utilizes potentiometric CO2 gas-sensing membrane electrodes. The method Is based on the Inhibition, by IgG, of CO2 production from β-ketoadlplc acid catalyzed by chloroperoxidase (Cl-POD) enzyme conjugated to IgG antibody. Under appropriate experimental conditions, the Inhibition of the 1:1 enzyme-antibody conjugate Is shown to be a function of IgG levels In the μg mL-1 range with good selectivity. Separation of bound from unbound conjugate or the use of a second antibody are not required In this method.

Original languageEnglish (US)
Pages (from-to)2586-2590
Number of pages5
JournalAnalytical chemistry
Issue number13
StatePublished - Nov 1984


ASJC Scopus subject areas

  • Analytical Chemistry

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