Intended use:

Usage of Compact Dry LS is a simple and safe test procedure for quantification of Listeria contaminations in foods or raw materials – as well as pharmaceutical raw materials. The ready-to-use plates consist of a special 50 mm diameter petri dish containing a detection specific nutrient pad.

General Information:

Listeria can be found in almost all areas of life. It is possible to assess the risk of contamination via quantitative detection to ensure that, if necessary, preventive measures can be taken. Listeria monocytogenes, in particular, is considered a major cause of food poisoning, possibly resulting in the development of sepsis, meningitis and encephalitis.

Compact Dry LS contains a standard nutrient medium for detection of Listeria spp. Due to the integrated chromogenic substances in the medium, Listeria grow as blue colonies with a diameter of between one and two millimeters. It is common knowledge that Listeria ivanovii grows very slowly and L. seeligeri is inhibited.

The ready-to-use, chromogenic Compact Dry plates are suitable for in-process controls as well as controls of finished products. With the optional additional product Promedia ST-25 swab test (Z0302) Compact Dry plates may also be used for surface sampling and therefore applied for quantitative hygiene monitoring even at surfaces which are difficult to reach.


  • Compact Dry LS is therefore an extremely easy-to-use method and also convincing due to the high time saving; a confirmation test is also not necessary.



Article NumbersHS8811 / HS8812
Test format HS8811: 100 nutrient plates,
HS8812: 40 nutrient plates,
four plates are packed in one aluminum bag.
Sample preparation Viable count in water or liquid foodstuff, in solid foodstuff or in swab tests.
Incubation time 24 ± 2 h plus a further 24 ± 2 h at 35 or 37 + 1 °C
Detected analyte

Listeria = blue colonies

Evaluation Visual counting
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Food microbiology testing_Compact Dry ETB_blank nutrient pad left_red colonies enterobacteriaceae+color change rightFood microbiology testing_Compact Dry SL_blank nutrient pad left_green-black colonies Salmonella_color change_motility right