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Guo S, Duan J, Tang Y, Qian Y, Zhao J, Qian D, Su S, Shang E. Simultaneous qualitative and quantitative analysis of triterpenic acids, saponins and flavonoids in the leaves of two Ziziphus species by HPLC–PDA–MS/ELSD. Journal of Pharmaceutical and Biomedical Analysis. 2011 Sep;56(2):264–70. doi: 10.1016/j.jpba.2011.05.025. |