Mobility of Water in Starch‐Sucrose Systems Determined by Deuterium and Oxygen‐17 NMR

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Abstract
The molecular mobility of water in a starch‐sucrose system was determined by deuterium (2H) and oxygen‐17 (17O) high‐field Nuclear Magnetic Resonance (NMR) spectroscopy. The starch‐sucrose system was composed of freeze‐dried starch:sucrose (FSS) (90:10) in deuterium oxide or enriched oxygen‐17 water over the solids concentration range of 10 to 93% solids. The NMR transverse relaxation rate (R2) and peak behavior were analyzed in terms of solids concentration and water activity. R2 of the FSS system is compared to the R2 of starch and sucrose systems alone. The relaxation behavior of the 2H and 17O were compared for FSS, starch and sucrose. The results led to the conclusion that the best NMR methodology for the investigation of water mobility is provided by 17O NMR.