Influence of water, temperature and sucrose on dynamics in glassy starch-based products studied by low field 1H NMR

Abstract In this study, the influence of both water content and temperature on the mobility of glassy starch-based matrices (starch alone or mixed with sucrose at the ratio 0% to 20% db) were studied using time domain 1 H NMR. The 2nd moment M 2 , and transversal relaxation time T 2 ∗ were used to study the molecular mobility of the rigid and mobile fraction of the NMR signal, respectively. The molecular mobility of the protons constituting the samples increased with water content (up to 13% wb) at all temperatures. For a given water content, both rigid and mobile protons exhibited a lower mobility in the presence of sucrose. When mobility characteristic parameters, M 2 second moment values…