The need for routine, non-destructive chemical screening of agricultural products is increasing due to the health hazards
to animals and humans associated with intentional and unintentional contamination of foods. Melamine, an industrial
additive used to increase flame retardation in the resin industry, has recently been used to increase the apparent protein
content of animal feed, of infant formula, as well as powdered and liquid milk in the dairy industry. Such contaminants,
even at regulated levels, pose serious health risks. Chemical imaging technology provides the ability to evaluate large
volumes of agricultural products before reaching the consumer. In this presentation, recent advances in chemical
imaging technology that exploit Raman, fluorescence and near-infrared (NIR) are presented for the detection of
contaminants in agricultural products.
The current study highlights the possibility of fine-tuning the chemistry and structure of periodic mesoporous organosilica (PMO) upon incorporation of large heterocyclic bridging group, tris[3-(trimethoxysilyl)propyl]isocyanurate (ICS), into its framework. This PMO was prepared by direct co-condensation of ICS and tetraethylorthosilicate (TEOS)in the presence of block copolymer used as structure directing agent. It was shown that up to a relatively high percentage of ICS a hexagonally ordered mesostructure with P6mm symmetry is formed. The co-condensation of ICS, TEOS and (3-mercaptopropyl)trimethoxysilane (SH) in the presence of poly(ethylene)-poly(propylene)-poly(ethylene) block copolymer afforded novel PMO with isocyanurate groups in the framework and mercaptopropyl groups on the surface of mesopores. It was surprising to find that the structure symmetry of this bifunctional PMO was not hexagonal but cubic. This structural change was induced by addition of another organosilane to the synthesis gel that afforded PMO with I4132 symmetry. Nitrogen adsorption, thermogravimetry, and small angle X-ray scattering were employed to monitor structural and interfacial changes of the PMO studied.
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