Simultaneous determination of tetrahydropalmatine and tetrahydroberberine in rat urine using dispersive liquid-liquid microextraction coupled with high-performance liquid chromatography

2011 ◽  
Vol 34 (22) ◽  
pp. 3279-3286 ◽  
Author(s):  
Mingyong Zhang ◽  
Jian Le ◽  
Jun Wen ◽  
Yifeng Chai ◽  
Guorong Fan ◽  
...  
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