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The use of water stable isotope ratios (hydrogen/deuterium and oxygen 16/18) as authenticity markers to verify geographical origin is very well established.  It requires producing a database of delta (δ)  values by collecting reference data from the claimed country or region of origin, but also collecting comparative data from other regions to validate or disprove the food’s origin. Swiss researchers in collaboration with Agroisolab GmbH, have developed a model, which allows the oxygen isotope ratio in plants to be calculated from individual regions, thereby eliminating the need for the time-consuming collection of reference data. The model utilises the temperature, precipitation and humidity data of the country/region, and information about the growing season of a plant, all of which are available from publicly accessible databases. The model was tested and validated on a unique δ18O reference dataset for strawberries collected across Europe over a period of 11 years. The case study has shown that the model can simulate the origin of the strawberries with a high degree of accuracy.    

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