Strontium elemental and isotopic signatures of Bordeaux wines for authenticity and geographical origin assessment

Ekaterina Epova (1) , Sylvain Bérail (1) , Fabienne Seby (2) , Véronique Vacchina (2) , Gilles Bareille (1) , Bernard Médina , Laurence Sarthou , Olivier François Xavier Donard (1)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 UT2A - Ultra Traces Analyses Aquitaine

The 87Sr/86Sr ratio and Sr concentrations of 43 authentic Bordeaux wines from the world's most prestigious châteaux are presented in the context of their relation to the geographical origin of wine and authenticity. The results demonstrate relatively narrow spans of variabilities observed for 87Sr/86Sr ratio and Sr concentrations in authentic Bordeaux wines, which can be used with reasonable certainty as specific parameters for identifying regional wineries. For comparison, a set of imitated Bordeaux wines was studied for Sr isotopic and elemental compositions. A significant excess of both parameters in suspicious wines were found in reference to authentic values. Such natural and anthropogenically induced variations offer an enhanced discriminating potential of Sr. The unique Sr binary signature may detect imitated wines and trace genuine products from different regional wineries. The obtained results shown a promising perspective for wine authenticity control by means of Sr isotopic and elemental composition.

Mots clés: (87)Sr/(86)Sr isotope ratio; Bordeaux wine; Geographical origin; Multi-collector ICP-MS; Sr concentrations; Terroir; Wine authenticity

Domaines: Chimie analytique; Autre; Ingénierie des aliments

Ekaterina Epova, Sylvain Bérail, Fabienne Seby, Véronique Vacchina, Gilles Bareille, et al.. Strontium elemental and isotopic signatures of Bordeaux wines for authenticity and geographical origin assessment. Food Chemistry, 2019, 294, pp.35-45. ⟨10.1016/j.foodchem.2019.04.068⟩. ⟨hal-02289255⟩