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Biosens Bioelectron. 1998 Jan 1;13(1):75-85.

Chemiluminescent biosensors based on porous supports with immobilized peroxidase.

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  • 1Laboratory of Enzyme Engineering, Chemistry Faculty, M. V. Lomonosov, Moscow State University, Russia.

Abstract

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.

PMID:
9519452
[PubMed - indexed for MEDLINE]
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