title: [Studies on chemical components of the volatile oil from the leaves of Hypericum perforatum].
abstract: OBJECTIVE
  To determine the volatile oil of the leaves from Hypericum perforatum L..
  
  
  METHODS
  The essential oil was obtained by simultaneous distillation and solvent extraction. The chemical components were seperated and identified by GC-MS. The relative contents in the volatile oil were determined by area nomalization.
  
  
  RESULTS
  54 chemical constituents were separated and identified representing 92.32% of the total contents.
  
  
  CONCLUSIONS
  Sesquiterpenes are major chemical constituents in the oil from the leaves of Hypericum perforatum L.. They are very different from those of the essential oil from the same species from the other country.
authors.affiliation: School of Chemistry and Chemical Engineering, Xiangtan University, 411105.
authors.forename: H
authors.initials: H
authors.lastname: Zeng
authors.forename: P
authors.initials: P
authors.lastname: Zhou
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D020902:Hypericum / Q000737:chemistry*; D009822:Oils, Volatile / Q000737:chemistry / Q000302:isolation & purification*; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012717:Sesquiterpenes / Q000032:analysis*; D013729:Terpenes / Q000032:analysis
chemical_list: D009822:Oils, Volatile; D012717:Sesquiterpenes; D013729:Terpenes