Liu H, Wei Y, Lu H, Wei S, Jiang T, Zhang Y, Ban J, Guo B
Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, No.1 Nongda South Rd., Beijing, 100193, China.
Division of Chemical Metrology and Analytical Science, National Institute of Metrology, No. 18 North Third Ring Rd., Beijing, 100029, China.
J Mass Spectrom. 2017 Apr;52(4):248-253. doi: 10.1002/jms.3930.
As Sr/ Sr ratio plays a significant role in authenticating the geographical origin of foodstuff, it is important to identify where the Sr/ Sr signature in food comes from, and the methods of Sr/ Sr ratio analysis in food and environmental samples. Wheat with three genotypes, soil and groundwater samples were collected from three regions of China during harvest time of 2014. The Sr/ Sr ratios in the samples were determined by thermal ionization mass spectrometer in order to investigate the possible source of Sr/ Sr in wheat, and the concentrations of Rb and Sr in wheat and soils were also detected by inductively coupled plasma mass spectrometry and combined with Sr/ Sr ratio in order to trace the geographical origin of wheat. The Sr/ Sr ratio, the contents Rb and Sr, and Rb/Sr ratio of wheat and soil samples showed significant differences among three regions. The Sr/ Sr ratios and the concentrations of Rb and Sr in soils were higher than those in corresponding wheat. The Sr/ Sr ratio in wheat was identical to that corresponding soil NH NO extracts (labile fraction of soil) and groundwater. Wheat uptake more Rb than Sr. 3D distribution of Sr/ Sr, Rb and Sr could identify wheat samples from different regions clearly. The Sr/ Sr ratio of wheat reflects the Sr/ Sr ratio of the associated environment including soil and groundwater. It is expected that the use the parameters of Sr/ Sr ratio, the contents of Rb and Sr will allow to trace geographical origin of wheat. Copyright © 2017 John Wiley & Sons, Ltd.
由于锶同位素比值在鉴别食品地理来源方面发挥着重要作用，因此确定食品中锶同位素特征的来源以及食品和环境样品中锶同位素比值的分析方法很重要。在2014年收获季节，从中国三个地区采集了三种基因型的小麦、土壤和地下水样本。通过热电离质谱仪测定样本中的锶同位素比值，以研究小麦中锶同位素的可能来源，还通过电感耦合等离子体质谱法检测了小麦和土壤中铷和锶的浓度，并结合锶同位素比值来追踪小麦的地理来源。小麦和土壤样本的锶同位素比值、铷和锶含量以及铷/锶比值在三个地区之间存在显著差异。土壤中的锶同位素比值以及铷和锶的浓度高于相应小麦中的含量。小麦中的锶同位素比值与相应土壤的硝酸铵提取物（土壤的活性部分）和地下水的比值相同。小麦吸收的铷比锶多。锶同位素、铷和锶的三维分布能够清晰地鉴别不同地区的小麦样本。小麦的锶同位素比值反映了包括土壤和地下水在内的相关环境的锶同位素比值。预计利用锶同位素比值、铷和锶的含量等参数将能够追踪小麦的地理来源。版权所有© 2017约翰威立父子有限公司。
