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Unique hydration behavior of potato starch as determined by deuterium nuclear magnetic resonance
- Yakubu, P.I., Baianu, I.C., Orr, P.H.
- Journal of food science 1990 v.55 no.2 pp. 458-461
- potato starch, physicochemical properties, deuterium, nuclear magnetic resonance spectroscopy
- Deuterium Nuclear Magentic Resonance (NMR) measurements at 4.7 Tesla revealed a unique hydration behavior of potato starch that involved the presence of a tightly bound water population with anisotropic motions within the potato starch granule, even in the presence of excess, bulk water in potato starch slurries. Well-defined powder patterns with residual deuterium quadrupole splittings of about 1 kHz were also observed at 20 degrees C for raw potato tubers. Three other water populations, a weakly bound, a surface-trapped, and a bulk water population, were also present up to 60% starch and were in fast exchange with each other at room temperature, resulting in a broadened, single Lorentzian 2H NMR peak. These three water populations were absent below 35% moisture content in potato starch, but not in corn starch. The unique hydration properties of potato starch might be important for novel processing methodology.