multielement analysis (2)


Durum wheat is used for the manufacture of pasta. Declaration of geographical origin is an increasing regulatory requirement. In this study, authentic samples of durum wheat from different Italian, European, and non-European regions harvested in different years were collected, and their 87Sr/86Sr isotopic ratio determined. The samples were also analysed by inductively coupled plasma mass spectrometry (ICP‒MS) to determine 75 elements. A tiered approach was adopted in which the results of the 87Sr/86Sr analysis were input to a second step of support vector machine classification modelling (SVMC) based on the concentrations of 8 of the 75 elements ( Al, Mn, Mo, P, S, Ti, Y, and Zn). The model was validated against a blind set of samples. This predictive model was able to distinguish satisfactorily between Italian durum wheat and durum wheat from the rest of the world.

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 10861730681?profile=RESIZE_400xAlcobaça apples are a desireable, old variety of apple grown in Portugal. They are registered as a PGI (Protected Geographical Indication), which covers production in a small area of the west coast of Portugal. This project developed a method to verify the origin of Alcobaça apples and hence their PGI status using multielement analysis and chemometrics.  “Alcobaça Apples” PGI apple pulp samples, Portuguese PGI and non-PGI areas, as well as different PGI cultivars and clones, were analysed for 23 elements content. Using VIP-PLS-DA (Variable Importance in Projection Partial Least-Squares Discriminant Analysis) on the  multielement signatures, it was possible to verify the origin to the PGI growing areas, and distinguish them from other varieties of apples grown in the same area and different areas.

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