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1.
Bioorg Khim ; 16(10): 1332-8, 1990 Oct.
Article in Russian | MEDLINE | ID: mdl-2085325

ABSTRACT

Some biochemical and catalytic properties of peroxidase from Arthromyces ramosus (EC 1.11.7.1) in chemiluminescent reaction of luminol oxidation by hydrogen peroxide were investigated. The second order rate constants were determined by the stopped-flow technique. Optimal conditions to quantity the enzyme were found, the detection limit being 5.10(-13) M. The peroxidase was used as a marker in the human IgG immunoassay.


Subject(s)
Coprinus/enzymology , Peroxidases/immunology , Catalysis , Hydrogen Peroxide/chemistry , Immunoenzyme Techniques , Immunoglobulin G/analysis , Isoelectric Focusing , Kinetics , Luminol/chemistry , Oxidation-Reduction , Peroxidases/chemistry
2.
J Biolumin Chemilumin ; 4(1): 164-76, 1989 Jul.
Article in English | MEDLINE | ID: mdl-2678913

ABSTRACT

The mechanism of peroxidase-catalysed oxidation of luminol by H2O2 was studied. The stopped-flow technique was used to measure the rate constants for the reactions between the oxidized forms of peroxidase with luminol and the following substrates: p-iodophenol, p-bromophenol, p-clorophenol, o-iodophenol, m-iodophenol, luciferin, and 2-iodo-6-hydroxybenzothiazole. The correlation between kinetic parameters and the degree of enhancement was established. The effect of charged synthetic polymers and specific antibodies on the peroxidase activity in the enhanced chemiluminescent reaction was also studied. The close approach of an effector molecule to the active site of the enzyme was found to inhibit the enhanced chemiluminescent reaction. Novel homogeneous methods of luminescent immunoassay (LIA) for (1) antibodies to insulin, (2) insulin and (3) antibodies to trinitrophenyl group are proposed on the basis of regulatory facilities of the enhanced chemiluminescent reaction. Based on the enhanced chemiluminescent reaction a peroxidase flow-injection assay was developed and successfully tested in the flow-injection enzyme immunoassays for human IgG and for thyroxin (T4). The immunoassay proposed has a detection limit of 10(-9) M for IgG and 10(-11) M for T4, the overall time of the assay being 5-15 min.


Subject(s)
Immunochemistry , Immunoenzyme Techniques , Luminescent Measurements , Haptens , Horseradish Peroxidase , Humans , Immunoglobulin G/analysis , Insulin/analysis , Insulin Antibodies/analysis , Kinetics , Luminol , Oxidation-Reduction , Substrate Specificity , Thyroxine/analysis
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