Zhao Xiangsheng, Wei Jianhe, Shu Xiaoyan, Kong Weijun, Yang Meihua
Hainan Branch Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Wanning, 571533, China.
Hainan Branch Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Wanning, 571533, China; Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193, China.
Chemosphere. 2016 Dec;164:430-435. doi: 10.1016/j.chemosphere.2016.08.122. Epub 2016 Sep 3.
Contents of twenty elements (Mg, K, Ca, Na, Fe, Al, Zn, Ba, Mn, Cu, Mo, Cr, Ni, As, Se, Cd, Hg, Tl, Pb and V) in two medical and edible plant species, Alpinia oxyphylla and Morinda officinalis were simultaneously determined by inductively coupled plasma-mass spectrometry (ICP-MS) method after microwave digestion with HNO-HO (6:1, v/v) as the digestion solvent. Certified standard reference material Poplar leaf was used to assess the accuracy of the method. The greatest contents of Mg, K, Ca, Al, Fe and Na were found in dried Alpinia oxyphylla and Morinda officinalis samples. The contents of five heavy metals including Pb, Cd, As, Hg and Cu in Alpinia oxyphylla did not exceed the limits. The contents of Pb in 76.67% samples and Cd in two batches of Morinda officinalis samples exceeded the limits set by Chinese Pharmacopeia. The contents of the selected elements in different parts (leaves, stems, roots and fruits) of Alpinia oxyphylla varied considerably. The highest concentrations of Mg, Ca, Mn and Se were found in the leaves of Alpinia oxyphylla, at the same time, while, the contents of 9 elements including Cd, Cr, Cu, As, Pb in the roots were the highest. The transfer ratios of selected elements from both species of herbs into their decoctions were reduced. Especially for the heavy metals, the transfer ratios were below 30% except As (79.73%) in Morinda officinalis. The results showed that decoction of the samples may reduce the intake of heavy metals.
采用电感耦合等离子体质谱法（ICP-MS），以HNO₃-H₂O₂（6:1，v/v）为消解溶剂，经微波消解后，同时测定了益智和巴戟天这两种药食两用植物中20种元素（Mg、K、Ca、Na、Fe、Al、Zn、Ba、Mn、Cu、Mo、Cr、Ni、As、Se、Cd、Hg、Tl、Pb和V）的含量。采用杨树叶标准物质对该方法的准确性进行评估。在益智和巴戟天的干燥样品中，Mg、K、Ca、Al、Fe和Na的含量最高。益智中Pb、Cd、As、Hg和Cu这5种重金属的含量未超过限量。巴戟天76.67%的样品中Pb含量以及两批样品中Cd含量超过了《中国药典》规定的限量。益智不同部位（叶、茎、根和果实）所选元素的含量差异很大。同时，益智叶中Mg、Ca、Mn和Se的浓度最高，而根部Cd、Cr、Cu、As、Pb等9种元素的含量最高。两种草药中所选元素向其煎出液中的转移率降低。尤其是重金属，除巴戟天中的As（79.73%）外，转移率均低于30%。结果表明，样品煎出液可能会减少重金属的摄入量。
