dc.contributor.advisor | Mustapha, Azlin | eng |
dc.contributor.author | Wang, Luxin, 1983- | eng |
dc.date.issued | 2009 | eng |
dc.date.submitted | 2009 Fall | eng |
dc.description | The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. | eng |
dc.description | Title from PDF of title page (University of Missouri--Columbia, viewed on January 28, 2011). | eng |
dc.description | Thesis advisor: Dr. Azlin Mustapha. | eng |
dc.description | Vita. | eng |
dc.description | Includes bibliographical references. | eng |
dc.description | Ph. D. University of Missouri--Columbia 2009. | eng |
dc.description.abstract | Accurate and fast detection methods for foodborne pathogens from various food samples have always been important goals for scientists from many research areas. DNA-based PCR techniques cannot differentiate between DNA from live and dead cells. Ethidium bromide monoazide (EMA) is a dye that can bind to DNA of dead cells and prevent its amplification by PCR. An EMA staining step prior to real-time PCR allows for the effective inhibition of DNA contamination from dead cells. With an optimized EMA staining step, the detection range was 10₃ to 10₉ CFU/ml for pure cultures, 10₅ to 10₉ CFU/ml for artificially contaminated poult y samples, and 10₈ to 10₄ CFU/g for ground beef samples. After a 12-h enrichment step, EMA combined real-time PCR could detect as low as 10 CFU/ml Salmonella from poultry products, as well as 10 CFU/g E. coli O157:H7 from ground beef. Quantum dots (QDs) are a family of nanosized particles with a 1 to 10 nm in radius. It has long-term stable photostability, high quantum yield, broad absorption spectra, narrow emission spectra and high signal-to-noise ratio. In this study, bead free QD facilitated detection method was used to detect Salmonella and E. coli O157:H7 cells from pure cultures, it can detect as low as 10 CFU/ml cells. When it was applied to artificially contaminated ground beef, it can detect 10₆ CFU/g cells. After enrichment, it can detect as low as 10 CFU/g Salmonella cells from ground beef. | eng |
dc.format.extent | xii, 145 pages | eng |
dc.identifier.oclc | 698706832 | eng |
dc.identifier.uri | https://hdl.handle.net/10355/9862 | |
dc.identifier.uri | https://doi.org/10.32469/10355/9862 | eng |
dc.language | English | eng |
dc.publisher | University of Missouri--Columbia | eng |
dc.relation.ispartofcommunity | University of Missouri--Columbia. Graduate School. Theses and Dissertations | eng |
dc.rights.license | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License. | |
dc.subject.lcsh | Foodborne diseases | eng |
dc.subject.lcsh | Escherichia coli O157:H7 -- Detection | eng |
dc.subject.lcsh | Salmonella -- Detection | eng |
dc.subject.lcsh | Beef -- Microbiology | eng |
dc.subject.lcsh | Food contamination | eng |
dc.title | Novel PCR-based rapid detection strategies for Escherichia coli O157:H7 and Salmonella in meat products | eng |
dc.type | Thesis | eng |
thesis.degree.discipline | Food science (MU) | eng |
thesis.degree.grantor | University of Missouri--Columbia | eng |
thesis.degree.level | Doctoral | eng |
thesis.degree.name | Ph. D. | eng |