The Determination of Listeria monocytogenes in Foods with Optical Biosensors

Abstract

Listeria monocytogenes is a food-borne intracellular pathogen that is resistant to adverse conditions of food processing and is a causative agent of high mortality listeriosis disease. Analysis of large food lots is limited by culture methods. Nowadays, although the conventional culture methods have been adopted as the gold standard method, they can be insufficient to control food parties that reach very large quantities. Biosensors with on-site detection potential and their characterizing with high accuracy and precision offers many opportunities for real-time estimation of industrial contamination. As the most promising technique for rapid detection of L.monocytogenes, ones based on surface plasmon resonance (SPR) and fiber optic biosensors (FOBs) where direct or indirect detections can be made by detecting the interaction of the biomarker element with the optical field without marking or labeling, have come to the fore. SPR and FOBs can be detected directly in the range of 102-106 cfu/ml and ≤101-103 cfu/ml, respectively.