Detection of bacterial pathogens in low moisture foods with Dual Immunological Raman-Enabled Crosschecking Test (DIRECT) and Raman mapping

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2020-01-01
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Pan, Cheng
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Chenxu Yu
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Agricultural and Biosystems Engineering

Since 1905, the Department of Agricultural Engineering, now the Department of Agricultural and Biosystems Engineering (ABE), has been a leader in providing engineering solutions to agricultural problems in the United States and the world. The department’s original mission was to mechanize agriculture. That mission has evolved to encompass a global view of the entire food production system–the wise management of natural resources in the production, processing, storage, handling, and use of food fiber and other biological products.

History
In 1905 Agricultural Engineering was recognized as a subdivision of the Department of Agronomy, and in 1907 it was recognized as a unique department. It was renamed the Department of Agricultural and Biosystems Engineering in 1990. The department merged with the Department of Industrial Education and Technology in 2004.

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1905–present

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  • Department of Agricultural Engineering (1907–1990)

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Agricultural and Biosystems Engineering
Abstract

Food safety has always been an essential topic in our lives; about 30 foodborne disease outbreaks occurred each year for the last decade. People paid more attention and were more cautious about the food safety issue than ever before. Food manufacturers also aim to provide more healthy and safer food products to customers. In the past, low moisture foods (LMFs) have not drawn too much attention and concern as being with a high risk of contamination with foodborne pathogens. More and more cases of outbreaks related to LMFs changed that perception, and now LMFs are no longer assumed safe automatically.Conventional detection methods such as ELISA (Enzyme-linked immunosorbent assay) and PCR (Polymerase chain reaction) used to test the foodborne disease pathogens nowadays often require a flow-based system that relies on multiple washing steps to collect the pathogens from foods for analysis. These systems cannot provide a rapid and convenient test for LMFs, which, by definition, do not flow. In this thesis, A Dual Immunological Raman-Enabled Crosschecking Test (DIRECT) scheme was developed to provide direct and rapid detection of foodborne disease pathogens in LMFs. Surface-Enhanced Raman Scattering (SERS) technique was applied in this detection method to achieve a low limit of detection threshold (at 10^2 CFU/g in model LMF systems). We demonstrated the feasibility of this approach with two MRAs (molecular recognition agents). With the help of tape-based sampling and Raman mapping, the method has the potential to become a powerful tool for the detection of pathogens in LMFs to address this critical need for the food industry.

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Tue Dec 01 00:00:00 UTC 2020