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Molecular exchange in thermal equilibrium between dissolved and crystalline tripalmitin by NMR

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Author

Summary, in English

An NMR technique to measure exchange kinetics at thermal equilibrium in dispersions of moderately soluble crystalline material is presented. By monitoring the exchange of molecules between pools in solid and dissolved form, one can characterize the surface specific exchange rate. Illustrative experiments were performed in a model system with beta-type crystals of tripalmitin as the solid phase and tripalmitin, a fraction of it deuterated, dissolved in a medium-chain TG oil as the liquid phase. The concentration of deuterated tripalmitin in the solvent was followed by H-2 NMR after the crystals, which initially lack deuterated tripalmitin, were immersed in the liquid. The variation of the H-2 concentration in the solvent provided the surface specific exchange rate. No systematic errors, due to the slight difference in properties of the deuterated tripalmitin compared to hydrogenated tripalmitin, were observed. The methodology worked well between crystal concentrations of 2 and 4 wt%.

Department/s

  • Department of Food Technology, Engineering and Nutrition

Publishing year

2003

Language

English

Pages

1187-1192

Publication/Series

Journal of the American Oil Chemists Society

Volume

80

Issue

12

Document type

Journal article

Publisher

The American Oil Chemists' Society

Topic

  • Food Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 0003-021X