Starch retrogradation study in presence of sucrose by low-resolution nuclear magnetic resonance
1995
We have studied the evolution of the solid nuclear magnetic resonance (NMR) signal of starch-sucrose-water gels with four starch and water ratios (1.3; 1.5; 1.6; and 2.0) and percent of sucrose content (0-42). We have measured the range of the increase of the signal deltaS coming from the solid part of the samples for the retrogradation. This solid signal was determined from a bi-gaussian fitting. As the evolution of deltaS has a decreasing linear profile according to the amount of sucrose added, we made the assumption of a total inhibition of the effect of the water by the sucrose on starch for an amount of sucrose added corresponding to deltaS = 0. Our results support the idea of an interaction of 4.6 water molecules per sucrose molecule, where sucrose finds itself totally in the liquid phase. The addition of sucrose reduces the amount of gelatinized starch, but the water-sucrose entity plays a plastifying part during the retrogradation.
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