Differential Absortion of Metals from Soil to Diverse Vine Varieties from the Valley of Tulum (Argentina). Consequences to Evaluate Wine Provenance

FABANI, M. PAULA; TORO, M. EUGENIA; VAZQUEZ, FABIO; DÍAZ, M. PILAR; WUNDERLIN, D. ALBERTO

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

American Chemical Society

Año: 2009 vol. 57 p. 7409 - 7416

0021-8561

 We report the effect of vine variety on the absorption of metals from soil and its follow to wine through grape juice, looking to verify which metals could be used to effectively assess wine provenance. Eleven metals were determined by atomic absorption spectroscopy in 32 soils sampled from a single vineyard having different parcels dedicated to four red grape varieties (Cabernet Sauvignon, Bonarda, Malbec and Syrah). Metals were also measured in 16 grape juices (four varieties) and 18 wines (four varieties), constructing separate data matrices. K nearest neighbor method (KNN) allows distinguishing among different soils, juices and wines. Linear Discriminant Analysis (LDA) affords several descriptors to point out such difference: mainly Mg, Mn, Ca, K and Na. Further data analysis evidenced that some elements have equivalent concentrations in soil, juice and wine, while others did not. Canonical analysis shows that grape juice and wine have good correlation with their provenance soil at multivariate level. We suggest the use of Mg as useful geochemical marker of wine provenance, while Mn could be used to evaluate differences between wine varieties associated with plant physiology.