title: [Determining the quantity of hypericin in medicinal materials and asepsis seedings of Hypericum perforatum by HPLC].
abstract: OBJECTIVE
  To establish the method of determining the quantity of hypericin in Hypericum perforatum and determine the quantity of the hypericin in defferent medicinal materials and asepsis seedings which grow in defferent environment.
  
  
  METHODS
  The specimen is extracted with methanol--Pyridine (9:1) ultrasound extraction. Chromatographic assay is performed on a hypersily ODS2 (4.6 mm x 150 mm, 5 microm) column. The mobile phase is composed of methanol -1.56% dihydric natrium phosphate hydrogen natrium solution (shift solution's acidity to 2.1 with phosphoric acid)--ethyl acetate (4:1.9:1), velocity of flow is 1 mL x min(-1); column temperature is 35 degrees C; the detection wavelength is 590 nm.
  
  
  RESULTS
  A satisfactory seperaration between hypericin and impurity. The calibration curve is linear over the range of 0.0524-0.2620 microg for hypericin (r = 0.9998). The average recovery of hypericin is 97.50%.
  
  
  CONCLUSIONS
  The quantity of hypericin in Hypericum perforatum has something to do with the genetic factor, environment factor, growing period and dry means. The method of determining the quantity of hypericin can be regarded as the method of controling the quantity of medicinal materials.
authors.affiliation: Institute of Chinese Materia Medica, Academy of Traditional Chinese Medicine, Beijing 100700.
authors.forename: Mei-lan
authors.initials: ML
authors.lastname: Chen
authors.forename: Lu-qi
authors.initials: LQ
authors.lastname: Huang
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.forename: Mei-hong
authors.initials: MH
authors.lastname: Fu
authors.forename: Yong-ming
authors.initials: YM
authors.lastname: Luo
mesh_terms: D000873:Anthracenes; D002681:China; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D017753:Ecosystem; D020902:Hypericum / Q000737:chemistry* / Q000235:genetics; D010569:Perylene / Q000031:analogs & derivatives* / Q000032:analysis / Q000302:isolation & purification; D010946:Plants, Medicinal / Q000737:chemistry* / Q000235:genetics; D011786:Quality Control; D012621:Seasons
chemical_list: D000873:Anthracenes; D010569:Perylene; C004965:hypericin