Temperaturabhängigkeit des kernmagnetischen Relaxationsverhaltens von Wasserprotonen in nativer Stärke / The Temperatur Behaviour of the Transverse Relaxation of the Protons of Water Molecules in Native Starch

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Abstract
Measurements of the temperature behaviour of the transverse relaxation of the protons of water molecules in native potatoe starch show two sorption states and an exchange of protons between these states. From model calculations of Woessner and Zimmermann the occupation of the states and the exchange rate can be evaluated. The portion of more tightly bound water molecules comes out to be about 17%. The energy of activation of the exchange decreases with increasing water content and lies with values in the range of 26 to 31 kJ/mol distinctly below the values observed usually for proton-exchange processes in similar systems.