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A sensitive competitive ELISA for 2,4-dinitrophenol using 3,6-fluorescein diphosphate as a fluorogenic substrate.

Z Huang¹, N A Olson, W You

¹Molecular Probes, Inc., Eugene, OR 97402.

Journal of Immunological Methods

|May 18, 1992

Summary

A new competitive ELISA method offers sensitive detection of 2,4-dinitrophenol (DNP). Using a fluorogenic substrate, this assay achieves a 50-fold lower detection limit than conventional methods, enhancing DNP quantification.

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Area of Science:

Immunochemistry
Analytical Chemistry

Background:

Enzyme-linked immunosorbent assays (ELISAs) are crucial for detecting various analytes.
Quantifying small molecules like 2,4-dinitrophenol (DNP) often requires highly sensitive methods.

Purpose of the Study:

To establish a sensitive competitive ELISA for the detection of 2,4-dinitrophenol (DNP).
To compare the sensitivity of a fluorogenic substrate with a chromogenic substrate for DNP detection.

Main Methods:

Coating polystyrene microplates with a DNP-bovine serum albumin conjugate.
Utilizing a competitive binding assay with anti-DNP-alkaline phosphatase conjugate.
Detecting bound enzyme conjugate using either 3,6-fluorescein diphosphate (FDP) or p-nitrophenyl phosphate (PNPP) substrates.

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Main Results:

The competitive ELISA successfully detected 2,4-dinitrophenol (DNP).
The assay using the fluorogenic substrate FDP achieved a detection limit of 10 fmol DNP.
This detection limit was 50 times lower compared to using the chromogenic substrate PNPP.

Conclusions:

A highly sensitive competitive ELISA for DNP detection was developed.
The use of a fluorogenic substrate (FDP) significantly enhances assay sensitivity.
The developed method is adaptable for sensitive ELISAs of other small antigens, haptens, or drugs.