期刊
FOOD CHEMISTRY
卷 291, 期 -, 页码 59-67出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.03.125
关键词
Authentication; Compound-specific; Organic agriculture; Plants; Stable isotopes; Sulphate; Vegetables
资金
- Danish Council for Independent Research - Technology and Production Sciences via the COM-ISO project [DFF-1337-00055]
- CORE Organic II Funding Bodies, FP7 ERANet Project, CORE Organic II (Coordination of European Transnational Research in Organic Food and Farming systems) via the AuthenticFood project [249667]
- Ministry of Food, Agriculture and Fisheries, Denmark, via the OrgTrace research project [3304-FOJO-05-45-01]
- European Union Seventh Framework Programme (FP7) [613688]
Analytical methods for authenticity testing of organically grown vegetables are urgently needed. Here we present a novel method for organic authentication based on stable isotope ratio analysis of oxygen in plant-derived sulphate. We combined this method with stable isotope ratio analysis of bulk plant tissue and plant-derived nitrate to discriminate organic and conventional potato, carrot, and cabbage from rigidly controlled long-term field trials and from a case study using retail potatoes. It was shown that oxygen isotope ratios of sulphate from organic vegetables were significantly lower compared to their conventional counterparts and the values were directly linked to the fertilisation strategy. The classification power of sulphate isotope analysis was superior compared to known bulk tissue isotope markers and nitrate isotope values. In conclusion, oxygen isotope analysis of plant-derived sulphate represents a promising new method for authentication of organic vegetables.
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