Guttieri Mary J, Seabourn Bradford W, Liu Caixia, Baenziger P Stephen, Waters Brian M
Department of Agronomy and Horticulture, University of Nebraska , 279 Plant Science Hall, 1875 N 38th Street, Lincoln, Nebraska 68583-0915, United States.
United States Department of Agriculture , Agricultural Research Service, Hard Winter Wheat Quality Lab, 1515 College Ave, Manhattan, Kansas 66502, United States.
J Agric Food Chem. 2015 Dec 16;63(49):10681-8. doi: 10.1021/acs.jafc.5b04337. Epub 2015 Dec 2.
Hard winter wheat (Triticum aestivum L.) is a major crop in the Great Plains of the United States, and our previous work demonstrated that wheat genotypes vary for grain cadmium accumulation with some exceeding the CODEX standard (0.2 mg kg(-1)). Previous reports of cadmium distribution in flour milling fractions have not included high cadmium grain. This study measured the distribution of cadmium, zinc, and iron in flour and bran streams from high cadmium (0.352 mg kg(-1)) grain on a pilot mill that produced 12 flour and four bran streams. Recovery in flour was substantially greater for cadmium (50%) than for zinc (31%) or iron (22%). Cadmium, zinc, and iron in the lowest mineral concentration flour stream, representing the purest endosperm fraction, were 52, 22, and 11%, respectively, of initial grain concentration. Our results indicate that, relative to zinc and iron, a greater proportion of cadmium is stored in the endosperm, the source of white flour.
硬粒冬小麦（Triticum aestivum L.）是美国大平原地区的主要作物，我们之前的研究表明，小麦基因型在籽粒镉积累方面存在差异，有些超过了食品法典标准（0.2毫克/千克）。之前关于面粉加工组分中镉分布的报道并未涉及高镉籽粒。本研究在一台中试磨粉机上测定了来自高镉（0.352毫克/千克）籽粒的面粉和麸皮流中镉、锌和铁的分布，该磨粉机生产了12种面粉流和4种麸皮流。镉在面粉中的回收率（50%）显著高于锌（31%）或铁（22%）。最低矿物质浓度面粉流（代表最纯净的胚乳部分）中的镉、锌和铁分别占初始籽粒浓度的52%、22%和11%。我们的结果表明，相对于锌和铁，更大比例的镉储存在胚乳中，而胚乳是白面粉的来源。
