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Cadmium distribution in mature durum wheat grains using dissection, laser ablation-ICP-MS and synchrotron techniques.
Environmental Pollution ( IF 8.9 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.envpol.2020.113987
Bofang Yan 1 , Marie-Pierre Isaure 2 , Sandra Mounicou 2 , Hiram Castillo-Michel 3 , Wout De Nolf 3 , Christophe Nguyen 1 , Jean-Yves Cornu 1
Affiliation  

Understanding how essential and toxic elements are distributed in cereal grains is a key to improving the nutritional quality of cereal-based products. The main objective of this work was to characterize the distribution of Cd and of nutrients (notably Cu, Fe, Mn, P, S and Zn) in the durum wheat grain. Laser ablation inductively coupled mass spectrometry and synchrotron micro X-ray fluorescence were used for micro-scale mapping of Cd and nutrients. A dissection approach was used to quantitatively assess the distribution of Cd and nutrients among grain tissues. Micro X-ray absorption near-edge spectroscopy was used to identify the Cd chemical environment in the crease. Cadmium distribution was characterized by strong accumulation in the crease and by non-negligible dissemination in the endosperm. Inside the crease, Cd accumulated most in the pigment strand where it was mainly associated with sulfur ligands. High-resolution maps highlighted very specific accumulation areas of some nutrients in the germ, for instance Mo in the root cortex primordia and Cu in the scutellum. Cadmium loading into the grain appears to be highly restricted. In the grain, Cd co-localized with several nutrients, notably Mn and Zn, which challenges the idea of selectively removing Cd-enriched fractions by dedicated milling process.



中文翻译:

利用解剖,激光烧蚀-ICP-MS和同步加速器技术研究硬质硬质小麦籽粒中的镉分布。

了解谷物中必需和有毒元素的分布方式是改善谷物类产品营养质量的关键。这项工作的主要目的是表征硬粒小麦籽粒中Cd和养分(特别是Cu,Fe,Mn,P,S和Zn)的分布。激光烧蚀电感耦合质谱和同步加速器X射线荧光用于镉和营养物的微尺度绘图。解剖方法用于定量评估镉和营养物质在谷物组织中的分布。显微X射线吸收近边缘光谱用于鉴定折痕中的Cd化学环境。镉的分布特征是折痕中的强积累和胚乳中的不可忽略的扩散。在折痕里面 Cd在颜料链中积累最多,主要与硫配体结合。高分辨率地图突出显示了细菌中某些养分的非常特定的积累区域,例如根皮层原基中的Mo和盾片中的Cu。镉在谷物中的负载似乎受到严格限制。在谷物中,Cd与几种养分共存,尤其是Mn和Zn,这挑战了通过专用研磨工艺选择性去除富含Cd的馏分的想法。

更新日期:2020-01-14
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