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Comment published on 16 February 2022, see Foods 2022, 11(4), 564.
Article

The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios

1
Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
2
Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
3
Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Rocchetti
Foods 2021, 10(8), 1729; https://doi.org/10.3390/foods10081729
Received: 20 June 2021 / Revised: 15 July 2021 / Accepted: 21 July 2021 / Published: 27 July 2021
(This article belongs to the Special Issue Food Origin Analysis with Isotope Fingerprints)
This work presents the first use of Sr isotope ratios for determining the provenance of bovine milk from different regions of Slovenia. The analytical protocol for the determination of 87Sr/86Sr isotope ratio was optimised and applied to authentic milk samples. Considerable variability of 87Sr/86Sr ratios found in Slovenian milk reflects the substantial heterogeneity of the geological background of its origin. The results, although promising, cannot discount possible inter-annual or annual variation of the Sr isotopic composition of milk. The 87Sr/86Sr ratios of groundwater and surface waters are in good correlation with milk, indicating that the Sr isotopic fingerprint in milk is reflective of cow drinking water. The 87Sr/86Sr ratio has the potential to distinguish between different milk production areas as long as these areas are characterised by geo-lithology. Discriminant analysis (DA) incorporating the elemental composition and stable isotopes of light elements showed that 87Sr/86Sr ratio together with δ13Ccas and δ15Ncas values have the main discrimination power to distinguish the Quaternary group (group 6) from the others. Group 1 (Cretaceous: Carbonate Rocks and Flysch) is associated with Br content, 1/Sr and δ18Ow values. The overall prediction ability was found to be 63.5%. Pairwise comparisons using OPLS-DA confirmed that diet and geologic parameters are important for the separation. View Full-Text
Keywords: geographical origin; milk; cow diet; 87Sr/86Sr; discriminant analysis geographical origin; milk; cow diet; 87Sr/86Sr; discriminant analysis
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MDPI and ACS Style

Gregorčič, S.H.; Ogrinc, N.; Frew, R.; Nečemer, M.; Strojnik, L.; Zuliani, T. The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios. Foods 2021, 10, 1729. https://doi.org/10.3390/foods10081729

AMA Style

Gregorčič SH, Ogrinc N, Frew R, Nečemer M, Strojnik L, Zuliani T. The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios. Foods. 2021; 10(8):1729. https://doi.org/10.3390/foods10081729

Chicago/Turabian Style

Gregorčič, Staša Hamzić, Nives Ogrinc, Russell Frew, Marijan Nečemer, Lidija Strojnik, and Tea Zuliani. 2021. "The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios" Foods 10, no. 8: 1729. https://doi.org/10.3390/foods10081729

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