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

Abstract

Sr/Sr 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/Sr 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/Sr 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/Sr, even at a very small scale, for food products geographic origin assessment.

Sr isotope composition of Golden Delicious apples in Northern Italy reflects the soil 87Sr/86Sr ratio of the cultivation area

“…(B), a strong positive correlation between 87 Sr/ 86 Sr ratios of apple and soil samples was found ( r = 0.99, P < 0.01). Such agreement has been already reported previously, and confirms the dependence of the apple 87 Sr/ 86 Sr ratios on that of the soil. Moreover, a good overlap was found between the range of variability of the ratios for the apple and soil samples within each orchard, as attested by the SDs reported in Supporting information (Table S2).…”

Investigation of the crucial factors affecting accurate measurement of strontium isotope ratios by total evaporation thermal ionization mass spectrometry

“…Highly precise and accurate isotopic measurements are urgently required in multiple scientific areas such as the redefinition of the SI units, geochemistry, environment, geology, agriculture, nuclear science, archaeology, etc. Multi‐collector thermal ionization mass spectrometry (MC‐TIMS) is one of the state‐of‐the‐art techniques for high‐quality isotope analysis because its sources of uncertainty are relatively small and well understood .…”

Conservation of 87Sr/86Sr During Wine-Making of White Wines: A Geochemical Fingerprint of Geographical Provenance and Quality Production

“…The samples of grape, must, and wine presented in this study are all from one single organic farm and winery located in southern Tuscany, close to the town of Pitigliano, an area set on young volcanic rocks belonging to the Latera volcano succession (e.g., Conticelli et al, 1991Conticelli et al, , 2010; Figure 1, see also Supplementary Material). The organic farm and the relative parcels cover a total area of about 72 ha, although divided in two distinct vineyards, about 5 km far from each other, characterized by the presence of different geologic bedrocks, and thus soils, with a different Srisotopic composition (e.g., author's unpublished data; Conticelli et al, 2015;Tescione et al, 2018). The largest vineyard of the farm is located in the Pian de' Conati area (hereafter in tables and figures indicated as "vineyard a"), with soil derived from the Grotte di Castro ignimbrite (inset "a" in Figure 1).…”

“…FIGURE 1 | Geological sketch map of the study area (redrawn after Tescione et al, 2018), with rocks belonging to the Latera volcano succession, the last erupting volcano of the Vulsini district (e.g., Conticelli et al, 2010). It is worth noting that the Pian de' Conati vineyards fully developed within the Eutric Epileptic Andosols (IUSS, 2006) (autoct.…”

“…The adoption of isotopic ratios of heavy radiogenic elements (i.e., Sr and Nd) as possible geochemical tracers of food provenance is gaining scientific consensus within the scientific literature (e.g., Horn et al, 1993;Martin et al, 1999;Roβmann et al, 2000;Barbaste et al, 2002;Kawasaki et al, 2002;Fortunato et al, 2004;Kelly et al, 2005;Voerkelius et al, 2010;Bong et al, 2012;Durante et al, 2013;Marchionni et al, 2013Marchionni et al, , 2016Song et al, 2014;Medini et al, 2015;Petrini et al, 2015;Coelho et al, 2017;Tescione et al, 2018;Tommasini et al, 2018).…”