HPLC-ICP-MS研究炮制对中药砷形态的影响

应用高效液相色谱-电感耦合等离子体质谱联机技术(HPLC-ICP-MS)建立了中药中AsⅢ,AsⅤ,MMA和DMA等四种砷形态的同时测定方法,用该方法对黄芪、大黄、黄芩、何首乌、地黄等五种中药炮制前后砷形态的变化进行了比较研究,并对一个总砷超标的冬虫夏草样品进行了砷形态的分析.方法学验证表明:四种砷形态的线性相关系数(...

Study on arsenic speciation changes in crude and processed traditional Chinese medicines by HPLC-ICP-MS

A HPLC-ICP-MS method for simultaneous determination of As(III), As(V), MMA and DMA in traditional Chinese medicines (TCMs) was established, and the contents of As(III), As(V), MMA and DMA in a TCM with high total arsenic content (Cordyceps) and 5 crude and processed TCMs (Radix Astragali, Radix et Rhizoma Rhei, Radix Scutellariae, Radix Polygoni Multiflori and Radix Rehmanniae) were determined and analyzed. The method validation indicated that the correlative coefficients (r) for all speciations were bigger than 0.9984; the limits of quantitation (LOQ) were from 0.8 to 1.0 microg x L(-1); the reproducibility and stability were satisfactory with all RSDs less than 10%; the spiked recoveries ranged from 82.40% to 119.5%. The results of samples analysis showed that the inorganic arsenic (As(III) and As(V)) was the dominating speciation in the tested TCMs; MMA and DMA were not found in all plant resourced TCMs, but MMA was found in Cordyceps; all the tested TCMs indicated a content increasing of inorganic arsenic after processing.