title: A subzero 1H NMR relaxation investigation of water dynamics in tomato pericarp.
abstract: (1)H NMR relaxation times (T1 and T2) were measured at low field (0.47 T) in pericarp tissues of three tomato genotypes (Ferum, LA0147 and Levovil) at subzero temperature (-20 °C) and two ripening stages (mature green and red). The unfrozen water dynamics was characterised by two T1 and three T2 components. The relaxation time values and their associated relative populations allowed differentiating the ripening stage of only LA0147 and Levovil lines. But the three genotypes were unequivocally discriminated at the red ripe stage. The unfrozen water distribution was discussed in terms of specific interactions, especially with sugars, in relation with their osmoprotectant effects.
authors.affiliation: UR1268 Biopolymères Interactions Assemblages, INRA, F-44316 Nantes, France. Electronic address: loic.foucat@nantes.inra.fr.
authors.forename: Loïc
authors.initials: L
authors.lastname: Foucat
authors.affiliation: UR1268 Biopolymères Interactions Assemblages, INRA, F-44316 Nantes, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Lahaye
mesh_terms: D018551:Solanum lycopersicum / Q000737:chemistry*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water
keywords: NMR relaxation; Subzero temperature; Tomato pericarp; Unfreezable water distribution