title: [Changes of lignans' content in stems of Schisandra chinensis].
abstract: OBJECTIVE
  To determine lignan content in the vine stem of Schisandra chinensis during 12 months and provide the scientific basis for the development and utilization of the resources.
  
  
  METHODS
  Analysis was carried out on an Eclipse XDB C18 column eluted with a mixture of methanol-acetonitrile-water (43: 28: 29) as the mobile phase. The flowrate was 1.0 mL x min(-1), and the detection wavelength was set at 250 nm. Schisandrin, deoxyschizandrin and schisandrin B were used as reference substance, and the external standard method was used.
  
  
  RESULTS
  The content of three constituents in the vine stem varied under different months. Schisandrin's maximum is 2.3 mg x g(-1) in December, minimum is 1.4 mg x g(-1) in April. A Deoxyschizandrin's maximum is 0.8 mg x g(-1) in November, minimum is 0.4 mg x g(-1) in March; Schisandrin B's maximum is 3.0 mg x g(-1) in January, minimum is 1.1 mg x g(-1) in April.
  
  
  CONCLUSIONS
  The collection seasons for the vine stem of S. chinensis are autumn and winter.
authors.affiliation: Department of Pharmaceutics and Food Science, Tonghua Normal University, Tonghua 134002, China. yujunlin1962@163.com
authors.forename: Junlin
authors.initials: J
authors.lastname: Yu
authors.forename: Renshuang
authors.initials: R
authors.lastname: Sun
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Hu
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
mesh_terms: D002851:Chromatography, High Pressure Liquid; D034242:Cyclooctanes / Q000737:chemistry; D017705:Lignans / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D011083:Polycyclic Compounds / Q000737:chemistry; D032141:Schisandra / Q000737:chemistry*
chemical_list: D034242:Cyclooctanes; D017705:Lignans; D011083:Polycyclic Compounds; C015499:schizandrin B; C034734:schizandrin A; C011105:schizandrin