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Appl Environ Microbiol. 1990 November; 56(11): 3478-3481

Detection of Listeria monocytogenes in foods by immunomagnetic separation.

Department of Food Hygiene, Norwegian College of Veterinary Medicine, Oslo.

ABSTRACT

Immunomagnetic separation with immunomagnetic beads was used to isolate strains of Listeria monocytogenes both from pure cultures and from heterogeneous suspensions. The monoclonal antibodies used recognized all six strains of serotype 4 but only one of three strains of serotype 1. Coating procedure, incubation time, and number of immunomagnetic beads influenced the sensitivity of the isolation method. Less than 1 x 10(2) bacteria per ml in pure cultures and less than 2 x 10(2) bacteria per ml in enriched foods could be detected. The method represents a new approach to extraction and isolation of pathogenic bacteria directly from foods, after resuscitation, or from enrichment broths.

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