GUYON, Francois; VAN LEEUWEN, Cornelis; GAILLARD, Laetitia; GRAND, Mathilde; AKOKA, Serge; REMAUD, Gérald S.; SABATHIÉ, Nathalie; SALAGOÏTY, Marie-Hélène

doi:10.1051/bioconf/20170902021

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GUYON, Francois

VAN LEEUWEN, Cornelis

Ecophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]

GAILLARD, Laetitia

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BIO Web of Conferences. 2017, vol. 9, p. 1-3

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Measurements performed on a set of 32 authentic wines (not submitted to any oenological treatment) and their ethanol, recovered by distillation, show high correlation between delta C-13 of bulk wine and its ethanol. These measurements were performed by isotope ratio monitoring by mass spectrometry coupled to an elemental analyzer (irm-EA/MS). Then a series of wines produced by vines of which water status was assessed during the growing season with predawn leaf water potential measurements, was studied by irm-EA/MS. As expected delta C-13 is correlated to vine water status conditions, as a result of stomatal closure. The ethanol of these specific wines was also analyzed by isotope ratio monitoring and by nuclear magnetic resonance (irm-C-13 NMR) to determine carbon-13 composition on the two specific sites of the ethanol skeleton. If these measurements confirm the correlation between C-13 composition and vine growth conditions, the 13C stereospecific information does not make vine water status assessment more precise.< Leer menos

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Carbon-13 composition of bulk dry wines by irm-EA/MS and irm-13C NMR: An indicator of vine water status

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