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EDN (Eosinophil Derived Neurotoxin) ELISA for Human Stool (ImmuChrom)

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The Immuchrom EDN ELISA Kit is intended for the quantitative determination of EDN (eosinophil derived neurotoxin) in human stool samples. This immunoassay enables easy, rapid and precise quantification of EDN in biological samples. Quality controls are included with the kit. For research use only.


After activation eosinophil granulocytes are segregating the cationic glycoprotein EDN (eosinophil derived neurotoxin). This 18-21 kDa single stranded glycosylated protein is also known as EPX (eosinophil protein X). Together with ECP (eosinophil cationic protein), EDN belongs to the ribonuclease superfamily (Lit. 1-3). However EDN has a 100-fold increased ribonuclease activity. It is neurotoxic but not cytotoxic (Lit 4, 5). The activation of eosinophil granulocytes is important during inflammatory processes in allergic reactions. Thus EDN is a marker for eosinophil activation and degranulation.

The measurement of EDN in stool allows the detection of chronic inflammation in the gut. In the context of researching colitis ulcerosa and/or morbus crohn, measurement of EDN gives information on the activity of the disease and the prediction of a relapse.


Sandwich ELISA, HRP-labelled antibody

Other names

eosinophil derived neurotoxin, eosinophil protein X, EPX, non-secretory ribonuclease, RNase UpI-2, Ribonuclease 2, RNase 2, Ribonuclease US, RNASE2

Principle of Method

The EDN-ELISA test determines human EDN according to the “sandwich”-principle. EDN in sample, standard and controls binds to polyclonal antibodies, which are coated to the microtiter plate. After a washing step a peroxidase labeled polyclonal antibody is added. A second washing step is followed by the addition of the substrate which is converted to a colored product by the peroxidase. The reaction is terminated by the addition of an acidic stop solution. The optical densities are read at 450 nm in a microtiter plate reader. The EDN concentration can be calculated from the standard curve.

Sample Types


Sample Collection

In a stool sample extraction vial mix 15 mg stool with 1.5 ml extraction buffer (EXT), then vortex it until the mixture is homogenous. Transfer the resulting slurry to a plastic vial and centrifuge it for 10 min at 3000 x g. 100 μl of the supernatant are used in the test per well.

Standard Curve

Example of a standard curve with the Immuchrom EDN ELISA for Human Stool

Calibration Range:  0.55 ng/ml - 35 ng/ml

Limit of Detection

0.025 ng/ml

Intra-assay (Within-Run) C.V.

  • 8.7% (1672 ng/ml) [n = 10]
  • 6.6% (730 ng/ml) [n = 10]
  • 5.2% (197 ng/ml) [n = 10]

Inter-assay (Run-to-Run) C.V.

  • 10.1% (1178 ng/ml) [n = 10]
  • 7.8% (446 ng/ml) [n = 10]
  • 8.2% (218 ng/ml) [n = 10]

Intended Use

This assay is intended for research use only and is not for use in diagnostic procedures.


Summary References

  1. Durack D.T., et al., Proc. Natl. Acad. Sci. USA 78, 5165 (1981).
  2. Peterson C.G., et al., Immunology 50, 19 (1983).
  3. Slifman N.R., et al., J. Immunol.143, 2317 (1989).
  4. Gullberg U., et al., Biochem. Biophis. Res. Commun. 139, 1239 (1986).
  5. Slifman N.R., et al., J. Immunol. 137, 2913 (1986).

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