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United States Department of Agriculture

Agricultural Research Service

Research Project: THE ADVANCEMENT OF SPECTROSCOPIC SENSORS/CHEMOMETRIC ANALYSIS/BIOBASED PRODUCTS FOR QUALITY ASSESSMENT OF FIBER, GRAIN, AND FOOD COMMODITIES

Location: Quality and Safety Assessment Research Unit

Title: Characterization of novel sufraces by FTIR spectroscopy and atomic force microscopy for food pathogen detection

Authors
item HAWKINS, SAMANTHA
item PARK, BOSOON
item Amini, Paimun -
item Chen, Guojun -
item Xu, Bingqian -

Submitted to: American Chemical Society National Meeting
Publication Type: Abstract Only
Publication Acceptance Date: October 30, 2009
Publication Date: N/A

Interpretive Summary: The research presented describes the use of nanotechnology to detect pathogens in food matrices. We are seeking a chip with a coating that can be used to identify specific toxins and in extremely small quantities with high accuracy. The fabrication and modification of these surfaces is currently being tested using FTIR spectroscopy and Atomic Force Microscopy. FTIR and AFM can both be used to analyze what chemicals are present on the surfaces and in what quantities. We would like for this technology to be used in real-sample situations to ensure food safety.

Technical Abstract: Single molecular detection of pathogens and toxins of interest to food safety is within grasp using technology such as Atomic Force Microscopy. Using antibodies or specific aptamers connected to the AFM tip make it possible to detect a pathogen molecule on a surface. However, it also becomes necessary to trap that pathogen on the surface for detection. This can be carried out using linker molecules with a high affinity for chemical reaction with the pathogen. FTIR spectroscopy, along with AFM, has been used to study the surface characterization of certain linker molecules on a gold surface. A self assembled monolayer (SAM) of DSP was formed on the surface and NTA was then added to the surface to form a DSP-NTA linker. A different SAM of DSP-NTA was formed where the DSP and NTA had already reacted prior to being added to the surface. Both FTIR and AFM confirm that the order of addition of the linker to the surface affect the orientation and coverage of the linker molecule on the gold surface. This will affect the ability of the linker to effectively capture proteins on the surface for analysis.

Last Modified: 9/29/2014
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