title: [Determination of triterpenoid acids in leaves of Eriobotrya japonica collected at in different seasons].
abstract: OBJECTIVE
  To find out the change regularity of triterpenoid acids content in leaves of Eriobotrya japonica. (Folium Eriobotryae) in different seasons.
  
  
  METHODS
  The content of triterpenoid acids was determined by RP-HPLC.
  
  
  RESULTS
  The content changes of oleanolic acid, ursolic acid, corosolic acid were minor in the different seasons. The content of oleanolic acid and ursolic acid were highest in April while the content of corosolic acid was highest in July. The content of maslinic acid has a significant change, the material which collected in November has the highest content in a year.
  
  
  CONCLUSIONS
  The content of triterpenoid acids changes regularly.
authors.affiliation: Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China.
authors.forename: Han
authors.initials: H
authors.lastname: Lu
authors.forename: Chaopeng
authors.initials: C
authors.lastname: Xi
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Weilin
authors.initials: W
authors.lastname: Li
mesh_terms: D004365:Drugs, Chinese Herbal / Q000032:analysis; D031983:Eriobotrya / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D012621:Seasons; D014315:Triterpenes / Q000032:analysis*
chemical_list: D004365:Drugs, Chinese Herbal; D014315:Triterpenes