title: Microarray on digital versatile disc for identification and genotyping of Salmonella and Campylobacter in meat products.
abstract: Highly portable, cost-effective, and rapid-response devices are required for the subtyping of the most frequent food-borne bacteria; thereby the sample rejection strategies and hygienization techniques along the food chain can be tailor-designed. Here, a novel biosensor is presented for the generic detection of Salmonella and Campylobacter and the discrimination between their most prevalent serovars (Salmonella Enteritidis, Salmonella Typhimurium) and species (Campylobacter jejuni, Campylobacter coli), respectively. The method is based on DNA microarray developed on a standard digital versatile disc (DVD) as support for a hybridization assay and a DVD driver as scanner. This approach was found to be highly sensitive (detection limit down to 0.2 pg of genomic DNA), reproducible (relative standard deviation 4-19 %), and high working capacity (20 samples per disc). The inclusivity and exclusivity assays indicated that designed oligonucleotides (primers and probes) were able to discriminate targeted pathogens from other Salmonella serovars, Campylobacter species, or common food-borne pathogens potentially present in the indigenous microflora. One hundred isolates from meat samples, collected in a poultry factory, were analyzed by the DVD microarraying and fluorescent real-time PCR. An excellent correlation was observed for both generic and specific detection (relative sensitivity 93-99 % and relative specificity 93-100 %). Therefore, the developed assay has been shown to be a reliable tool to be used in routine food safety analysis, especially in settings with limited infrastructure due to the excellent efficiency-cost ratio of compact disc technology. Graphical Abstract DNA microarray performed by DVD technology for pathogen genotyping.
authors.affiliation: Instituto Int. Reconocimiento Molecular (IDM), Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
authors.forename: Luis Antonio
authors.initials: LA
authors.lastname: Tortajada-Genaro
authors.affiliation: Asociación de Investigación de la Industria Agroalimentaria (AINIA), Benjamín Franklin 5-11, 46980, Paterna, Valencia, Spain.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Rodrigo
authors.affiliation: Instituto Int. Reconocimiento Molecular (IDM), Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Hevia
authors.affiliation: Instituto Int. Reconocimiento Molecular (IDM), Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
authors.forename: Salvador
authors.initials: S
authors.lastname: Mena
authors.affiliation: Instituto Int. Reconocimiento Molecular (IDM), Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
authors.forename: Regina
authors.initials: R
authors.lastname: Niñoles
authors.affiliation: Instituto Int. Reconocimiento Molecular (IDM), Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain. amaquieira@qim.upv.es.
authors.forename: Ángel
authors.initials: Á
authors.lastname: Maquieira
mesh_terms: D015374:Biosensing Techniques; D002167:Campylobacter / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D005516:Food Microbiology; D005838:Genotype; D008461:Meat Products / Q000382:microbiology*; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation*; D012475:Salmonella / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*
keywords: Compact disc; DNA assay; Food-borne pathogens; Genotyping; Microarray