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Combined magnetic resonance imaging and high resolution spectroscopy approaches to study the fertilization effects on metabolome, morphology and yeast community of wine grape berries, cultivar Nero di Troia

Ciampa, Alessandra, Dell'Abate, Maria Teresa, Florio, Alessandro, Tarricone, Luigi, Di Gennaro, Domenico, Picone, Gianfranco, Trimigno, Alessia, Capozzi, Francesco, Benedetti, Anna
Food chemistry 2019 v.274 pp. 831-839
chemical analysis, chemometrics, cultivars, grape juice, isoleucine, leucine, magnetic resonance imaging, malic acid, metabolites, metabolome, nuclear magnetic resonance spectroscopy, physicochemical properties, physiological response, proline, small fruits, valine, wine grapes, yeasts
Effects of fertilization practices, mineral (M) and organo-mineral (OM), on molecular composition of Nero di Troia cultivar grape berries was studied using conventional chemical analysis, Magnetic Resonance Imaging (MRI) and 1H NMR spectroscopy on intact berries and extracts, respectively, and through analysis of yeast species developed on grape skins.Plants vegetative status did not differ between the two fertilization practices, whereas some grape juice chemical characteristics differed in fertilized grapes. MRI provided information on grape berries morphology through weighted images depending on spin-spin (T2) and spin-lattice (T1) relaxation times. T1 values were the highest in OM grape berries. 1H NMR metabolic profile, combined with chemometric analysis, evidenced significant differences for some metabolites (valine, leucine, isoleucine, proline, and malic acid). Furthermore, higher frequency of yeasts genus Starmella sp., isolated from OM grape berries contributed to reinforcing the found results on the physiological response of wine grape Nero di Troia to fertilization.