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1.
Mohammed A. Al-Nuri Nidal A. Za'tar Maher A. Abu-Eid Mohammad A. Hannoun Waheed J. Al-Jondi Ahmad I. Hussein 《光谱学快报》2013,46(8):1539-1543
A new method for isolation and specrophotometric determination of emodin is presented. Emodin was isolated by thin layer chromatography (tlc) and column chromatography (cc) techniques, as an orange long crystalline substance. Emodin exhibits two absorption maxima, at 420 and 520 nm. Stability of the color and the effect of pH were studied. Beer's law is obeyed in the range 2–30 ppm. The method is applied to the determination of emodin in roots, stems, and leaves of Rumex cyprius plant. 相似文献
2.
火焰原子吸收法测定夏枯草、桑叶、野菊花中十种微量元素 总被引:4,自引:1,他引:4
湿法消化样品 ,火焰原子吸收法测定三种草药中的 Mg、Ca、Zn、Mn、Co、Ni、Pb、Cd、Fe、Cu等 10种微量元素。回收率分别为 97.7%— 10 1.5 % ;96 .0 %— 10 5 .1% ;97.1%— 10 3.6 % ,相对标准偏差为 1.6 %—4 .5 % ;1.7%— 4 .7% ;1.7%— 4 .6 %。结果表明 ,三种草药均含有丰富的微量元素如 Mg、Ca、Zn、Mn、Fe、Cu等 ;为原料的开发和应用提供有效数据。 相似文献