title: Dynamics of pistachio oils by proton nuclear magnetic resonance relaxation dispersion.
abstract: 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.
authors: Dipartimento dei Sistemi Agro-Ambientali, Università degli Studi di Palermo, v.le delle Scienze 13, edificio 4, 90128 Palermo, Italy. pellegrino.conte@unipa.it
authors: Pellegrino
authors: P
authors: Conte
authors: Valerio
authors: V
authors: Mineo
authors: Salvatore
authors: S
authors: Bubici
authors: Claudio
authors: C
authors: De Pasquale
authors: Farid
authors: F
authors: Aboud
authors: Antonella
authors: A
authors: Maccotta
authors: Diego
authors: D
authors: Planeta
authors: Giuseppe
authors: G
authors: Alonzo
mesh_terms: D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D027927:Pistacia / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry* / Q000302:isolation & purification; D011522:Protons; D012639:Seeds / Q000737:chemistry*
chemical_list: D010938:Plant Oils; D011522:Protons