title: Separation and determination of honokiol and magnolol in herbal medicines by flow injection-capillary electrophoresis.
abstract: A simple, rapid, and accurate method for the separation and determination of honokiol and magnolol in Magnolia officinalis and related herbal medicines was developed by combination of flow injection (FI) and capillary zone electrophoresis (CZE). The analysis was carried out using an unmodified fused-silica capillary (50-microm I.D.; total length 7.5 cm; effective length 4.5 cm). A series of optimization steps afforded the following conditions: the sample solvent consisted of 150 mM NaOH and a running buffer composed of 10 mM sodium tetraborate/10 mM sodium dihydrogenphosphate (NaH2PO4) at pH 12 was applied for the separation of the analytes. The separation could be achieved within 5 min with a sample throughput rate of up to 28 h(-1). The repeatability (defined as the relative standard deviation, RSD) for honokiol and magnolol was 2.0% and 1.6% with peak area evaluation, 3.6% and 2.0% with peak height evaluation, and 2.0% and 1.4% with migration time evaluation, respectively. Regression equations revealed linear relationships (r = 0.9991-0.9998) between the peak area of each analyte and the concentration.
authors.affiliation: Department of Chemistry, Lanzhou University, Lanzhou, 730000, China. chenxg@lzu.edu.cn
authors.forename: Lihong
authors.initials: L
authors.lastname: Liu
authors.forename: Xinan
authors.initials: X
authors.lastname: Wu
authors.forename: Liuyin
authors.initials: L
authors.lastname: Fan
authors.forename: Xingguo
authors.initials: X
authors.lastname: Chen
authors.forename: Zhide
authors.initials: Z
authors.lastname: Hu
mesh_terms: D001713:Biphenyl Compounds / Q000032:analysis* / Q000302:isolation & purification*; D002021:Buffers; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002626:Chemistry, Pharmaceutical / Q000379:methods; D019075:Electrophoresis, Capillary / Q000379:methods*; D004867:Equipment Design; D029001:Herbal Medicine; D006863:Hydrogen-Ion Concentration; D017705:Lignans / Q000032:analysis* / Q000302:isolation & purification*; D031566:Magnolia / Q000378:metabolism; D008956:Models, Chemical; D010710:Phosphates / Q000737:chemistry; D010936:Plant Extracts / Q000032:analysis* / Q000302:isolation & purification*; D012044:Regression Analysis; D013997:Time Factors; D000498:Allyl Compounds; D010636:Phenols
chemical_list: D001713:Biphenyl Compounds; D002021:Buffers; D017705:Lignans; D010710:Phosphates; D010936:Plant Extracts; C005498:magnolol; C005499:honokiol; D000498:Allyl Compounds; D010636:Phenols; C018279:sodium phosphate