Starch - Stärke · 1987 · 34 citations · 35 references
Natural SciencesChemistryFood ScienceCereal SciencePhysical ChemistrySpectroscopyNuclear SpectroscopyRelaxation MechanismsStarch ChemistryWater ContentWater In FoodsWater TransportBound Water DeterminationCarbohydrate NmrDeuterium Nuclear Magnetic ResonanceMagnetic Resonance Relaxation TimesNuclear Magnetic Resonance StudiesStarch Physicochemical PropertiesStarch SolubilityWater State
Abstract The mobility of water in corn starch suspensions and high‐moisture powders (10 to 70% corn starch) was investigated by Nuclear Magnetic Resonance (NMR) spectroscopy, in water and deuterium oxide. Both oxygen‐17 ( 17 O) and deuterium ( 2 H) nuclei were probed with a single pulse. The standard isotropic two‐state model with fast exchange was used to interpret these data by means of a physical model (I) and a chemical activity model (II). According to I plots of relaxation rate against concentration indicated three regions of decreasing water mobility. According to II, the relaxation rate was linear with chemical activity over the entire concentration range. The correlation time calculated for the bound water showed high mobility.
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Official Methods of Analysis of
Analytical Chemistry · 1980 · 59.6K citations
Management, Educational Assessment, Information Retrieval +5
Phase transitions of the starch–water system
John W. Donovan · Biopolymers · 1979 · 930 citations