title: Isolation and identification of arctiin and arctigenin in leaves of burdock (Arctium lappa L.) by polyamide column chromatography in combination with HPLC-ESI/MS.
abstract: A simple method involving polyamide column chromatography in combination with HPLC-PAD and HPLC-ESI/MS for isolating and identifying two kinds of lignans, arctiin and arctigenin, in the leaves of burdock (Arctium lappa L.) has been established. After extraction of burdock leaves with 80% methanol, the aqueous phase of crude extracts was partitioned between water and chloroform and the aqueous phase was fractionated on a polyamide glass column. The fraction, eluting with 100% methanol, was concentrated and gave a white precipitate at 4 degrees C from which two main compounds were purified by semi-preparative HPLC. In comparison with the UV and ESI-MS spectra and the HPLC retention time of authentic standards, the compounds were determined to be arctiin and arctigenin. The extraction/separation technique was validated using an internal standard method.
authors.affiliation: Institute of Biochemistry and Molecular Biology, School of Life Science, Shandong University, Jinan 250100, China. smliuhn@yahoo.com
authors.forename: Shiming
authors.initials: S
authors.lastname: Liu
authors.forename: Kaoshan
authors.initials: K
authors.lastname: Chen
authors.forename: Willibald
authors.initials: W
authors.lastname: Schliemann
authors.forename: Dieter
authors.initials: D
authors.lastname: Strack
mesh_terms: D031170:Arctium / Q000737:chemistry*; D002845:Chromatography / Q000379:methods; D002851:Chromatography, High Pressure Liquid; D005663:Furans / Q000737:chemistry / Q000302:isolation & purification*; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D017705:Lignans / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D005663:Furans; D005960:Glucosides; D017705:Lignans; C077992:arctiin; C071942:arctigenin