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Evaluation of Antibodies for Immunomagnetic Separation Combined with Flow Cytometry Detection of Listeria monocytogenes

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Four polyclonal anti-Listeria antibodies were evaluated for the detection of Listeria monocytogenes in direct and indirect assays using immunomagnetic separation with flow cytometry. The efficiency of immunocapturing using magnetic beads was also determined. None of the tested antibodies exhibited sufficient specificity or avidity to allow sufficient separation and detection of L. monocytogenes for a useful test that differentiated between negative (without cell) and positive (with cell) samples. Plating results confirmed that cells were captured with Dynabeads anti-Listeria and magnetic beads coated with goat anti-Listeria antibody with recovery ranging from 7 to 23%. Fluorescent-labeled polyclonal antibodies used in this study were not sufficiently specific to allow the detection of L. monocytogenes cells captured by the beads.


Document Type: Research Article

Affiliations: 1: Center for Food Safety, Department of Food Science and Technology, The University of Georgia, Athens, Georgia 30602-7610 2: Office of Plant, Dairy Foods, and Beverages, U.S. Food and Drug Administration, Washington, D.C. 20204, USA

Publication date: July 1, 2003

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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