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Zhang M, Le J, Wen J, Chai Y, Fan G, Hong Z. Simultaneous determination of tetrahydropalmatine and tetrahydroberberine in rat urine using dispersive liquid–liquid microextraction coupled with high‐performance liquid chromatography. J of Separation Science. 2011 Oct 26;34(22):3279–86. doi: 10.1002/jssc.201100588. |