title: [Study on chemical constituents from essential oil of Hypericum patulum].
abstract: OBJECTIVE
  To investigate the chemical constituents from the essential oil of Hypericum patulum, and provide the scientific basis for exploitation.
  
  
  METHODS
  The essential oil was extracted by steam distillation. The chemical constituents of the essential oil were analyzed by GC-MS. The relative contents of these constituents were calculated using square peaks to normalization.
  
  
  RESULTS
  72 peaks were separated and 24 constituents were identified, which constituted about 79.50% of the total essential oil.
  
  
  CONCLUSIONS
  The main constituents are alpha-pinene (18.14%), 2,4a,5,6,7,8-hexahydro-3,5,5,9-tetramethyl-,(R)-1H-benzocycloheptene (13.64%), beta-caryophyllene (9.41%), longifolene (6.23%), etc.
authors.affiliation: School of Pharmacy, Dali University, Dali 671000, China. zlslj0888@yahoo.com.cn
authors.forename: Lan-sheng
authors.initials: LS
authors.lastname: Zhang
authors.forename: Guang-ping
authors.initials: GP
authors.lastname: Dong
authors.forename: Guang-ming
authors.initials: GM
authors.lastname: Liu
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D020902:Hypericum / Q000737:chemistry*; D015394:Molecular Structure; D008970:Molecular Weight; D039821:Monoterpenes / Q000032:analysis*; D009822:Oils, Volatile / Q000737:chemistry / Q000302:isolation & purification*; D010946:Plants, Medicinal / Q000737:chemistry*; D012717:Sesquiterpenes / Q000032:analysis
chemical_list: D039821:Monoterpenes; D009822:Oils, Volatile; D012717:Sesquiterpenes