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Klein, Barbara P. Lai, Hsi Mei 2011-05-07T12:14:39Z 2011-05-07T12:14:39Z 10000-01-01 1990 The water mobility in simple sugar-water systems as a function of sugar concentration was monitored by $\sp1$H, $\sp2$H and $\sp1$H decoupled $\sp{17}$O NMR transverse relaxation rates (R$\sb2$). For all three nuclei, R$\sb2$ increased with increasing sugar concentration with different magnitude and different trends of increases. Comparison of $\sp1$H, $\sp2$H and $\sp{17}$O NMR R$\sb2$ relaxation rates, on a normalized basis ($\Delta$R$\sb2$/R$\sb{\rm 2F}$), suggested that only the $\sp{17}$O monitors directly the water in the sugar-water systems. The contribution of proton exchange broadening effect to the $\sp{17}$O NMR R$\sb2$ measurement in both water and sugar-water systems as a function of pH could be eliminated by applying the proton decoupling on the $\sp{17}$O NMR. The trend of the relaxation rates versus sugar concentration were the same for R$\sb1$ and R$\sb2$ measured by single-pulse and multipulse methods. Water mobility measured by $\sp1$H decoupled $\sp{17}$O NMR R$\sb2$ relaxation rate was used as a method of monitoring lactose crystallization in supersaturated solutions over time. $\sp2$H NMR R$\sb2$ relaxation rate was used to monitor the water mobility during the amorphous to crystalline state transition of lactose in skim milk powder. Changes in water mobility were found to be directly related to the observed moisture changes and the transition of lactose from the amorphous to crystalline state. Made available in DSpace on 2011-05-07T12:14:39Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026239.pdf: 4686703 bytes, checksum: 811f632921edb857d5dd283313f9fe3d (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:38:36Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:16:07-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9026239 (UMI)AAI9026239 http://hdl.handle.net/2142/19666 eng Copyright 1990 Lai, Hsi Mei Agriculture, Food Science and Technology Chemistry, Agricultural Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy text Human and Community Development Human and Community Development University of Illinois at Urbana-Champaign Dissertation Ph.D.