4.7 Article

87Sr/86Sr isotopes in grapes of different cultivars: A geochemical tool for geographic traceability of agriculture products

Journal

FOOD CHEMISTRY
Volume 258, Issue -, Pages 374-380

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.03.083

Keywords

Sr-87/Sr-86 of fresh grapes; White and red grapes; Geographic traceability; Geologic and pedologic fingerprints; Pitigliano area; Vulsini Mountains; Central Italy

Funding

  1. EnteCaRiFI, Italy by project GeoVino [2015.1000]
  2. Dipartimento di Scienze della Terra of the University of Florence, Italy
  3. Universita degli Studi Roma Tre - Smart Environments Project - Regione Lazio, Italy [LR 13/2008]

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Sr-87/Sr-86 was determined on fresh red and white grapes, soils and rocks from three selected vineyards to verify the isotopic relationships between the fruit of the vine and geologic substrata of vineyards. Sr-87/Sr-86 were determined on sampled grapes of four different harvest years and different grape varieties, on bioavailable fraction of soils, on whole soils, and on bedrocks from the geo-pedological substratum of the vineyards. The vineyards chosen for the experimental works belong to an organic farming winery and thus cultivation procedures were strictly controlled. Grapes were sampled during the harvests of four different but consecutive years with Sr-87/Sr-86 that does not change reflecting the values of the soil bioavailable fraction. No variations among grapes from different vine cultivars were observed. A strict isotope relationship with soil bio-available fraction was observed. These findings demonstrate the reliability of Sr-87/Sr-86, even at a very small scale, for food products geographic origin assessment.

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