Abstract
The deuteron magnetic resonance of a starch-based product (77% starch) has been recorded as a function of temperature (−40 to 25°) and moisture content (up to 20%). Two states of water molecules have been detected and characterised by their different mobilities. At 25°, the concentration of water in the less mobile fraction is in good agreement with the BET monolayer values, calculated from sorption isotherm measurements and from literature data for potato and maize starch. It is concluded that statistically only one of the three OH groups on each monomer of starch binds a water molecule. At 25° no more than one water molecule is bonded per monomer unit, but at lower temperatures this specific hydration increases. Even in the more mobile aqueous fraction, H 2OH 2O interactions reduce the rotational frequency by as much as 10 4–10 5 compared to its value in pure water.
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