Chemiluminescent biosensors based on porous supports with immobilized peroxidase.
Combining a sensitive and fast chemiluminescence detection method with novel immobilization methods for horseradish peroxidase (HRP) has enabled us to develop sensitive sensors for hydrogen peroxide and the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). HRP biospecific immobilization was shown to have well-defined advantages in terms of a higher specific activity of the enzyme of the surface and a greater sensitivity in the enhanced chemiluminescence (ECL) reaction. The lower detection limit for hydrogen peroxide was 0.025 nmol with HRP immobilized on nitrocellulose membrane through avidin-biotin linkage. An immunosensor for the detection of 2,4-D provides a lower detection limit of 0.2 microgram/l with specific antibodies covalently immobilized on photoactivated nylon. The assay with chemiluminescent detection was also characterized with a wider concentration range when compared with the colorimetric assay.
Rubtsova MYu
Laboratory of Enzyme Engineering, Chemistry Faculty, M. V. Lomonosov, Moscow State University, Russia.
Kovba
G V
GV
Egorov
A M
AM
D015084:2,4-Dichlorophenoxyacetic Acid; D000818:Animals; D015374:Biosensing Techniques; D004800:Enzymes, Immobilized; D006540:Herbicides; D006861:Hydrogen Peroxide; D007118:Immunoassay / Q000379:methods*; D008163:Luminescent Measurements; D051379:Mice; D009195:Peroxidase; D012680:Sensitivity and Specificity
D004800:Enzymes, Immobilized; D006540:Herbicides; D015084:2,4-Dichlorophenoxyacetic Acid; D006861:Hydrogen Peroxide; D009195:Peroxidase