Application of solid-state NMR spectroscopy to evaluate cassava genotypes |
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Institution: | 1. Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 USA;2. Department of Chemistry and Biochemistry, Southern Illinois University at Carbondale, Carbondale, IL 62901-4409 USA;3. Theoretical Separation Science Laboratory, Kroungold Analytical, Inc., 1299 Butler Pike, Blue Bell, Pennsylvania 19422 USA |
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Abstract: | Cassava is widely cultivated in tropical and subtropical regions of Africa, Asia and Latin America and is the third most important source of calories in the tropics, after rice and maize. Cassava is mainly composed of starch, fibre, proteins, lipids and essential minerals. However, the nutrient composition differs according to the variety. Despite the large number of cassava genotypes, studies involving both chemical composition and structural aspects through molecular dynamic behaviour are scarce. The present study investigated six cassava genotypes with respect to chemical composition and molecular dynamic behaviour, employing nuclear magnetic resonance (NMR) spectroscopy. The samples were characterized by high-field NMR and low-field NMR techniques, namely cross-polarization magic-angle spinning, variable contact time, proton spin-lattice relaxation time in rotating frame, spin-spin relaxation time and NMR measurements of lipid fraction. The combined use of solid-state NMR techniques was shown to be a powerful tool for characterizing foods such as cassava. The main results revealed that the six cassava genotypes differ in the chemical composition of the starch, as well as the minor components, such as fibre and oil. These differences influence structural aspects; thus changes in the molecular dynamic behaviour can be observed. |
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Keywords: | Cassava Food characterization Food analysis Food composition Solid-state NMR spectroscopy High-field NMR Low-field NMR Relaxometry |
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