Development of 87 Sr/ 86 Sr maps as targeted strategy to support wine quality

Influence of Chemical and Physical Variables on 87Sr/86Sr Isotope Ratios Determination for Geographical Traceability Studies in the Oenological Food Chain

“…Owing to these problems and in addition to the difficulties arising in the evaluation of the bioavailable fraction in the soil, as suggested by other researchers [29,30] and as reported in previous works [18], it should be a promising alternative to move from the "passive" soil collecting activity to an "active" one, where plants do directly the sampling [30][31][32].…”

“…When dealing with traceability models, it is of utmost importance to determine the identity of the geographical indicator that is used to monitor the food chain from the field to the final product. For geographical traceability issues, one of the indicators that can be used is the primary or direct type, such as metal content or isotope ratios of bio-elements ( 13 C/ 12 C, D/H, 18 O/ 16 O, 15 N/ 14 N, and 34 S/ 32 S) or radiogenic heavy elements ( 87 Sr/ 86 Sr, 145 Nd/ 143 Nd, and 207 Pb/ 206 Pb). One element, whose isotopic pattern shows promising perspective in different areas, with particular and peculiar applications in food traceability, is strontium [5][6][7][8][9][10][11][12][13][14][15].…”

“…In this paper, both aspects related to the influence of the soil size distribution on the isotopic data and the effectiveness of the Rb mathematical correction have been tackled. Furthermore, a preliminary study was carried out in order to verify whether the Sr isotopic ratio coming from vine branches can be a more distinctive geographical traceability tool for the Chianti Classico wine production areas, as other studies on the provenance have shown [10,18,22].…”

“…The obtained results showed that the 87 Sr/ 86 Sr ratio is not influenced by soil particle size and may represent an effective tool as a geographic provenance indicator for the investigated product.Beverages 2018, 4, 55 2 of 13 As a geographic food tracer, the most important feature of Sr is that this element is assimilated by the plant roots, and it has been shown that the isotopic ratio fingerprint, from the soil to the final product, remains almost unaltered (i.e., the isotopes do not undergo appreciable mass-dependent fractionation processes [16,17]). For a statistical approach to the geographical origin of food, a large dataset of precise and accurate values is needed in order to evaluate the indicator variability range of both the food and the soils and to build robust classification models [18].If, on the one hand, it is a quite simple task to collect isotopic ratios data for the food matrix, on the other hand, the interpretation of the data from the soil is complex [19][20][21]. In fact, depending on the geology of the territory, the 87 Sr/ 86 Sr ratio could vary considerably as a function of many variables difficult to evaluate a priori [22,23].…”

“…Beverages 2018, 4, 55 2 of 13 As a geographic food tracer, the most important feature of Sr is that this element is assimilated by the plant roots, and it has been shown that the isotopic ratio fingerprint, from the soil to the final product, remains almost unaltered (i.e., the isotopes do not undergo appreciable mass-dependent fractionation processes [16,17]). For a statistical approach to the geographical origin of food, a large dataset of precise and accurate values is needed in order to evaluate the indicator variability range of both the food and the soils and to build robust classification models [18].…”