The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios
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 <sup>87</sup>Sr/<sup>86</sup>Sr isotope ratio was optimised and applied to authentic milk s...
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MDPI AG
2021-07-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/10/8/1729 |
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| author | Staša Hamzić Gregorčič Nives Ogrinc Russell Frew Marijan Nečemer Lidija Strojnik Tea Zuliani |
| author_facet | Staša Hamzić Gregorčič Nives Ogrinc Russell Frew Marijan Nečemer Lidija Strojnik Tea Zuliani |
| author_sort | Staša Hamzić Gregorčič |
| collection | DOAJ |
| 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 <sup>87</sup>Sr/<sup>86</sup>Sr isotope ratio was optimised and applied to authentic milk samples. Considerable variability of <sup>87</sup>Sr/<sup>86</sup>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 <sup>87</sup>Sr/<sup>86</sup>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 <sup>87</sup>Sr/<sup>86</sup>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 <sup>87</sup>Sr/<sup>86</sup>Sr ratio together with <i>δ</i><sup>13</sup>C<sub>cas</sub> and <i>δ</i><sup>15</sup>N<sub>cas</sub> 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 <i>δ</i><sup>18</sup>O<sub>w</sub> 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. |
| first_indexed | 2024-03-10T08:49:27Z |
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| institution | Directory Open Access Journal |
| issn | 2304-8158 |
| language | English |
| last_indexed | 2024-03-10T08:49:27Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Foods |
| spelling | doaj.art-21e4c3edcf7e42129d6113b9b3257c8d2023-11-22T07:37:56ZengMDPI AGFoods2304-81582021-07-01108172910.3390/foods10081729The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope RatiosStaša Hamzić Gregorčič0Nives Ogrinc1Russell Frew2Marijan Nečemer3Lidija Strojnik4Tea Zuliani5Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, SloveniaDepartment of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, SloveniaDepartment of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New ZealandJožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, SloveniaDepartment of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, SloveniaDepartment of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, SloveniaThis 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 <sup>87</sup>Sr/<sup>86</sup>Sr isotope ratio was optimised and applied to authentic milk samples. Considerable variability of <sup>87</sup>Sr/<sup>86</sup>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 <sup>87</sup>Sr/<sup>86</sup>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 <sup>87</sup>Sr/<sup>86</sup>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 <sup>87</sup>Sr/<sup>86</sup>Sr ratio together with <i>δ</i><sup>13</sup>C<sub>cas</sub> and <i>δ</i><sup>15</sup>N<sub>cas</sub> 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 <i>δ</i><sup>18</sup>O<sub>w</sub> 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.https://www.mdpi.com/2304-8158/10/8/1729geographical originmilkcow diet<sup>87</sup>Sr/<sup>86</sup>Srdiscriminant analysis |
| spellingShingle | Staša Hamzić Gregorčič Nives Ogrinc Russell Frew Marijan Nečemer Lidija Strojnik Tea Zuliani The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios Foods geographical origin milk cow diet <sup>87</sup>Sr/<sup>86</sup>Sr discriminant analysis |
| title | The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios |
| title_full | The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios |
| title_fullStr | The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios |
| title_full_unstemmed | The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios |
| title_short | The Provenance of Slovenian Milk Using <sup>87</sup>Sr/<sup>86</sup>Sr Isotope Ratios |
| title_sort | provenance of slovenian milk using sup 87 sup sr sup 86 sup sr isotope ratios |
| topic | geographical origin milk cow diet <sup>87</sup>Sr/<sup>86</sup>Sr discriminant analysis |
| url | https://www.mdpi.com/2304-8158/10/8/1729 |
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