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KMID : 1007519970060040278
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Food Science and Biotechnology
1997 Volume.6 No. 4 p.278 ~ p.285
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Hydration Behavior and physicochemical Properties of Potato Starch Studied by Proton Nuclear Magnetic Resonance
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Rho Jeonghae
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Abstract
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Proton NMR relaxation technique has been used to investigate the hydration properties of potato starch suspensions to identify the water mobility and populations in potato starch by NMR and to investigate differences in physicochemical and hydration properties of potato starch compared with other starches. The proton NMR transverse relaxation rates and viscosity of starch suspensions depending on starch concentration had transitions and showed several regions of distinct behavior. The matrix formed with starch being paste, though it gives the large viscosity change by restricting the flaw of starch, does not affect the microscopic mobility of water. EDTA treated starch suspension in H₂O showed much higher relaxation rates than untreated starch suspension. In the case of potato starch at 0.25 g starch/g water concentration suspension, water populations were able to be divided to Long and short T₂s. By heating, there were reduction in population and decrease in T₂value for long T₂component. Three components of water was observed clearly in 0.23 g deuterated starch/g D₂O. This study was to relate the potato starch hydration properties to the behavior of starch in food systems and in food processing.
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