Investigation of Starch Hydration by 2D Time Domain NMR

M. Witeka, H. Peemoellerb, J. Szymońskac, and B. Blicharskaa aInstitute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland bDepartment of Physics, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1 cAgriculture Academy, al. Mickiewicza 21, 31-120 Kraków, Poland

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Received: 2005 20 05;

Proton exchange between spin groups of the solid matrix of hydrated granular potato starch and water was studied using the 2D time domain NMR. The proton spin-spin relaxation time T2, and spin-lattice relaxation time T1 (selective and non-selective pulse sequences) were measured at room temperature. The observed spin relaxation results were analysed for exchange assuming a two-site exchange model (between water and solid matrix of starch). In this analysis we determined the intrinsic spin-lattice relaxation time for water protons (49 ms) and solid starch matrix protons (172 ms), as well as the water-starch magnetization exchange rate (86 s-1).

DOI: 10.12693/APhysPolA.109.359 PACS numbers: 82.56.Na, 82.35.Pq