Extraction and determination of papaverin in pericarpium papaveris using aqueous two-phase system of poly(ethylene glycol)–(NH4)2SO4 coupled with high-performance liquid chromatography

2007 ◽  
Vol 590 (2) ◽  
pp. 187-194 ◽  
Author(s):  
Qing Cao ◽  
Shehong Li ◽  
Chiyang He ◽  
Kean Li ◽  
Feng Liu
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