期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 61, 期 16, 页码 3763-3773出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf305258r
关键词
wheat; multielement composition; isotopes; geographical origin; food authenticity
资金
- European TRACE Integrated Project (VI FP) [006942]
- ANPCYT [PICT-2008-0554]
- SECyT National University of Cordoba
- CONICET (National Research Council, Argentina)
The aim of this study was to investigate if elemental and isotopic signatures of Argentinean wheat can be used to develop a reliable fingerprint to assess its geographical provenance. For this pilot study we used wheat cultivated at three different regions (Buenos Aires, Cordoba, and Entre Rios), together with matching soil and water. Elemental composition was determined by ICP-MS. delta C-13 and delta N-15 were measured by isotopic ratio mass spectrometry, while Sr-87/Sr-86 ratio was determined using thermal ionization mass spectrometry. Wheat samples from three sampling sites were differentiated by the combination of 11 key variables (K/Rb, Ca/Sr, Ba, Sr-87/Sr-86, Co, Mo, Zn, Mn, Eu, delta C-13, and Na), demonstrating differences among the three studied regions. The application of generalized Procrustes analysis showed 99.2% consensus between cultivation soil, irrigation water, and wheat samples, in addition to clear differences between studied areas. Furthermore, canonical correlation analysis showed significant correlation between the elemental and isotopic profiles of wheat and those corresponding to both soil and water (r(2) = 0.97, p < 0.001 and r(2) = 0.96, p < 0.001, respectively). To our knowledge, this is the first report demonstrating the correspondence between soil, water, and wheat samples using different statistical methods, showing that wheat elemental and isotopic compositions are mainly related to soil and irrigation water characteristics of the site of growth.
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