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Water relations of simple sugar solu...

Lai, Hsi Mei.

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Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy./
Author:	Lai, Hsi Mei.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1990,
Description:	189 p.
Notes:	Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 1570.
Contained By:	Dissertation Abstracts International51-04B.
Subject:	Food science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9026239

Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy.
Lai, Hsi Mei.

Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy. - Ann Arbor : ProQuest Dissertations & Theses, 1990 - 189 p.

Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 1570.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 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.Subjects--Topical Terms:

3173303
Food science.

Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy.
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100 1 $a Lai, Hsi Mei. $3 3283818
245 1 0 $a Water relations of simple sugar solutions and skim milk powder as studied by nuclear magnetic resonance spectroscopy.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1990
300 $a 189 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 1570.
500 $a Adviser: S. J. Schmidt.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1990.
520 $a 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.
590 $a School code: 0090.
650 4 $a Food science. $3 3173303
650 4 $a Agricultural chemistry. $3 523947
690 $a 0359
690 $a 0749
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 51-04B.
790 $a 0090
791 $a Ph.D.
792 $a 1990
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9026239