Novel application of NMR relaxometry in studies of diffusion in virgin rape oil.
Field cycling (FC) proton nuclear magnetic resonance ((1)H NMR) relaxometry was applied to study the dynamics of rape oil molecules. The spin-lattice relaxation data, measured in the frequency range from 0.01 to 30 MHz, were analysed by applying relaxation theory combined with the force-free-hard-sphere (FFHS) diffusion model. In the low frequency range, the relaxation was dominated by the translational diffusion contribution. Therefore, the diffusion coefficient of rape oil was determined from a linear dependence of the (1)H NMR relaxation dispersion drawn as a function of the square root of Larmor frequency. The results are consistent with those obtained from the pulse gradient spin echo (PGSE) NMR method. To estimate the density of oil protons, a parameter required to derive the diffusion coefficient from NMR relaxometry, a single point imaging (SPI) NMR experiment was proposed.
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland. Electronic address: radam@ifmpan.poznan.pl.
A
A
Rachocki
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
J
J
Tritt-Goc
D029741:Brassica rapa / Q000737:chemistry*; D004058:Diffusion; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D010938:Plant Oils / Q000737:chemistry*
D010938:Plant Oils
Diffusion coefficient; FC NMR relaxometry; Force-free-hard-sphere model; Molecular dynamics; Pulse gradient spin echo (PGSE); Rape oil; Single point imaging (SPI)