title: Determination of DL-tetrahydropalmatine in Corydalis yanhusuo by L-tetrahydropalmatine imprinted monolithic column coupling with reversed-phase high performance liquid chromatography.
abstract: A method for direct determination of DL-tetrahydropalmatine (DL-THP) in Corydalis yanhusuo, a traditional Chinese herb, by L-THP imprinted monolithic precolumn on-line/off-line coupling with reversed-phase high performance liquid chromatography (RP-HPLC) was developed. The L-THP imprinted monolithic column has been prepared by in situ polymerization using methacrylic acid (MAA) and ethylene dimethacrylate (EDMA) as functional monomer and cross-linker, respectively. With the optimization of chromatographic conditions, such as mobile phase composition, flow rate, column temperature and sample loading, for the separation of enantiomer, DL-THP was base-line separated on the MIP. The imprinted monolithic column was used as a precolumn for fractionation of the C. yanhusuo extract. Both the non-retained and retained fractions were separated by RP-HPLC. Meanwhile, the D-THP and L-THP can be detected in the non-retained and retained fractions, respectively. Additionally, direct determination of L-THP using molecularly imprinted monolith on-line coupling with a reversed-phase column was acquired.
authors.affiliation: National Chromatographic R&A Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Ou
authors.forename: Liang
authors.initials: L
authors.lastname: Kong
authors.forename: Chensong
authors.initials: C
authors.lastname: Pan
authors.forename: Xingye
authors.initials: X
authors.lastname: Su
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Lei
authors.forename: Hanfa
authors.initials: H
authors.lastname: Zou
mesh_terms: D001600:Berberine Alkaloids / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation* / Q000379:methods; D031311:Corydalis / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D001600:Berberine Alkaloids; C014215:tetrahydropalmatine