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Multivariate analyses of major and trace elements in 19 species of herbs consumed in Yunnan, China

机译:云南省食用19种草药中主要和微量元素的多元分析

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This study aimed to analyze the concentrations of 10 elements in 19 species of herbs related to medical and edible purpose in Yunnan, China. Microwave-assisted acid digestion was used for all of the dried herbs and element contents were determined by inductively coupled plasma atomic emission spectrometry. The accuracy of this method was validated by analyzing GBW07605 certified reference material. The results indicated that the distributions of element contents were varied over a wide range in the specimens tested. The decreasing sequence of average element content expressed as dry weight was presented as follows: calcium (1740–22,246 μg/g dry weight), magnesium (634–6367 μg/g dry weight), iron (52.8–5707 μg/g dry weight), barium (9.19–465 μg/g dry weight), zinc (10.7–82.1 μg/g dry weight), strontium (8.25–69.8 μg/g dry weight), copper (4.10–36.6 μg/g dry weight), chromium (0.26–13.3 μg/g dry weight), nickel (0.57–14.7 μg/g dry weight), and cadmium (0.11–2.66 μg/g dry weight). The element contents of samples were different depending on several species. However, the accumulations of toxic elements (cadmium, chromium, and nickel) were above the international safety standards limit in most samples. Principal component analysis generated three principal components that explained 77% of the total variance in the data. Similar samples may get together by cluster analysis and could correspond to the result of principal component analysis.
机译:本研究旨在分析云南省19种与医疗和食用目的有关的草药中10种元素的浓度。微波辅助酸消解用于所有干草药,元素含量通过电感耦合等离子体原子发射光谱法测定。通过分析GBW07605认证的参考物质,验证了该方法的准确性。结果表明,元素含量的分布在测试样品中变化很大。以干重表示的平均元素含量递减顺序如下:钙(1740–22,246μg/ g干重),镁(634–6367μg/ g干重),铁(52.8–5707μg/ g干重),钡(干重9.19–465μg/ g),锌(干重10.7–82.1μg/ g),锶(干重8.25–69.8μg/ g),铜(干重4.10–36.6μg/ g),铬(干重0.26–13.3μg/ g),镍(干重0.57–14.7μg/ g)和镉(干重0.11–2.66μg/ g)。样品的元素含量因几种而异。但是,在大多数样品中,有毒元素(镉,铬和镍)的积累超过了国际安全标准的限制。主成分分析生成了三个主成分,这些主成分解释了数据中总方差的77%。相似的样本可能通过聚类分析聚集在一起,并且可能对应于主成分分析的结果。

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