Exchange rate between crystalline tripalmitin and liquid triglyceride oil analysed by NMR.
Författare
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 b-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 2H NMR after the crystals, which initially lack deuterated tripalmitin, were immersed in the liquid. The variation of the 2H 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%.
Avdelning/ar
- Department of Food Technology, Engineering and Nutrition
Publiceringsår
2003
Språk
Engelska
Sidor
1187-1192
Publikation/Tidskrift/Serie
Journal of the American Oil Chemists Society
Volym
80
Issue
12
Dokumenttyp
Artikel i tidskrift
Förlag
The American Oil Chemists' Society
Ämne
- Food Engineering
Nyckelord
- triglyceride.
- surface exchange
- Colloid chemistry
- surface chemistry
- deuterium NMR dispersion
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0003-021X