NDLI: The Provenance of Slovenian Milk Using$ ^{87}Sr/^{86}$Sr Isotope Ratios

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The Provenance of Slovenian Milk Using$ ^{87}Sr/^{86}$Sr Isotope Ratios

Content Provider	MDPI
Author	Sta, ša Gregorčič Marijan, Nečemer Ogrinc, Nives Frew, Russell Strojnik, Lidija Zuliani, Tea
Copyright Year	2021
Description	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$ ^{87}Sr/^{86}$Sr isotope ratio was optimised and applied to authentic milk samples. Considerable variability of$ ^{87}Sr/^{86}$Sr ratios found in Slovenian milk reflects the substantial heterogeneity of the geological background of its origin. The results, although promising, cannot discount possible inter-annual or annual variation of the Sr isotopic composition of milk. The$ ^{87}Sr/^{86}$Sr ratios of groundwater and surface waters are in good correlation with milk, indicating that the Sr isotopic fingerprint in milk is reflective of cow drinking water. The$ ^{87}Sr/^{86}$Sr ratio has the potential to distinguish between different milk production areas as long as these areas are characterised by geo-lithology. Discriminant analysis (DA) incorporating the elemental composition and stable isotopes of light elements showed that$ ^{87}Sr/^{86}$Sr ratio together with δ^{13}$C_{cas}$ and δ^{15}$N_{cas}$ 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 δ^{18}$O_{w}$ 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.
Starting Page	1729
e-ISSN	23048158
DOI	10.3390/foods10081729
Journal	Foods
Issue Number	8
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2021-07-27
Access Restriction	Open
Subject Keyword	Foods Geographical Origin Milk Cow Diet 87sr/86sr Discriminant Analysis
Content Type	Text
Resource Type	Article

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