6533b873fe1ef96bd12d5972
RESEARCH PRODUCT
Dynamics of pistachio oils by proton nuclear magnetic resonance relaxtion dispersion
Salvatore BubiciAntonella MaccottaClaudio De PasqualeFarid AboudPellegrino ConteValerio MineoDiego PlanetaGiuseppe Alonzosubject
RelaxometryMagnetic Resonance SpectroscopyChemistryRelaxation (NMR)Dynamics (mechanics)Settore AGR/13 - Chimica AgrariaAnalytical chemistrySettore AGR/15 - Scienze E Tecnologie AlimentariBiochemistryPISTACHIO OILfood.foodAnalytical ChemistryViscosityfoodChemical physicsPistachio oils FFC NMR NMRD Relaxometry Kinematic viscosity.PistaciaSeedsProton NMRPlant OilsSettore CHIM/01 - Chimica AnaliticaProtonsDispersion (chemistry)Chemical compositionSettore CHIM/02 - Chimica Fisicadescription
A number of pistachio oils were selected in order to test the efficacy of nuclear magnetic resonance relaxation dispersion (NMRD) technique in the evaluation of differences among oils (1) obtained from seeds subjected to different thermal desiccation processes, (2) retrieved from seeds belonging to the same cultivar grown in different geographical areas and (3) produced by using seed cultivars sampled in the same geographical region. NMRD measures relaxation rate values which are related to the dynamics of the chemical components of complex food systems. Results not only allowed to relate kinematic viscosity to relaxometry parameters but also were successful in the differentiation among the aforementioned oils. In fact, from the one hand, the larger the kinematic viscosity, the faster the rotational motions appeared as compared to the translational ones. On the other hand, relaxation rate curves (NMRD) varied according to the oxidative stresses and chemical composition of each sample. The present study showed for the first time that NMRD is a very promising technique for quick evaluations of pistachio oil quality without the need for time-consuming chemical manipulations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-03-25 |