title: Separation and determination of strychnine and brucine in Strychnos nux-vomica L. and its preparation by nonaqueous capillary electrophoresis.
abstract: An easy, rapid method for simultaneous determination of strychnine and brucine in Strychnos nux-vomica L. and its preparation was developed by nonaqueous capillary electrophoresis (NACE) without pretreatment for the first time. Optimum separation was achieved with a fused-silica capillary column (50 cmx75 microm i.d.) and a running buffer containing 30 mM ammonium acetate, 1.0% acetic acid and 15% acetonitrile (ACN) in methanol medium. The applied voltage was 30.0 kV. The analytes were detected by UV at 214 nm. The effects of concentration of ammonium acetate, acetic acid and organic modifier on electrophoretic behavior of the analytes were studied. The established method with sophoridine as internal standard was linear in the range of 5-1000 mg/mL for both strychnine and brucine. The extracts of Strychnos nux-vomica and its preparation could be directly injected for determination with recoveries ranging from 94.5 to 104%.
authors.affiliation: Department of Chemistry, Lanzhou University, Lanzhou 730000, PR China.
authors.forename: Yuqin
authors.initials: Y
authors.lastname: Li
authors.forename: Xiaojun
authors.initials: X
authors.lastname: He
authors.forename: Shengda
authors.initials: S
authors.lastname: Qi
authors.forename: Wenhua
authors.initials: W
authors.lastname: Gao
authors.forename: Xingguo
authors.initials: X
authors.lastname: Chen
authors.forename: Zhide
authors.initials: Z
authors.lastname: Hu
mesh_terms: D000085:Acetates / Q000737:chemistry; D000097:Acetonitriles / Q000737:chemistry; D002021:Buffers; D000697:Central Nervous System Stimulants / Q000032:analysis* / Q000302:isolation & purification; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D000432:Methanol / Q000737:chemistry; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013331:Strychnine / Q000031:analogs & derivatives* / Q000032:analysis* / Q000302:isolation & purification; D031461:Strychnos nux-vomica / Q000737:chemistry*; D013997:Time Factors
chemical_list: D000085:Acetates; D000097:Acetonitriles; D002021:Buffers; D000697:Central Nervous System Stimulants; D004365:Drugs, Chinese Herbal; D012997:Solvents; C083806:brucine; D013331:Strychnine; C018824:ammonium acetate; D000432:Methanol; C032159:acetonitrile