title: [Alpha-linolenic acid and linoleic acid in extract of Portulaca oleracea L. determined by high-performance liquid chromatography].
abstract: OBJECTIVE
  To determine alpha-linolenic acid and linoleic acid in extract of Portulaca oleracea L. by high performance liquid chromatography (HPLC).
  
  
  METHODS
  The determination was done with a Shim-pack CLC-ODS (250 mm x 4.6 mm, 5 microm) and a DIKMA Easyguard C18 (10 mm x 4.6 mm). Elution was employed with the mobile phase of methanol-acetonitrile-0.5% phosphonic acid (60:22:18) at flow rate of 1.1 ml/min. Column temperature was 26 degrees centigrade. Detection wavelength was 210 nm. Injection volume was 25 microl.
  
  
  RESULTS
  The standard curves of alpha-linolenic acid and linoleic acid were linear in the range 0.016 2 to 0.194 4 mg/ml and 0.016 9 to 0.203 0 mg/ml, respectively. The regression equations were A=2.915 8 x 10(7) C+12,250.9, r=0.999 9 and A=1.366 4 x 10(7) C-9,759.39, r=0.999 9, respectively. The average recovery rates were 100.5% and 100.8%, respectively.
  
  
  CONCLUSIONS
  The present method (HPLC) may be considered to be reliable and simple for the determination of alpha-linolenic acid and linoleic acid in extract of Portulaca oleracea L.
authors.affiliation: Department of Traditional Chinese Medicine, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.
authors.forename: Hai-liang
authors.initials: HL
authors.lastname: Xin
authors.forename: Yin-huan
authors.initials: YH
authors.lastname: Hou
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Jin-cai
authors.initials: JC
authors.lastname: Lu
authors.forename: Chang-quan
authors.initials: CQ
authors.lastname: Ling
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D019787:Linoleic Acid / Q000302:isolation & purification*; D031822:Portulaca / Q000737:chemistry*; D017962:alpha-Linolenic Acid / Q000302:isolation & purification*
chemical_list: D017962:alpha-Linolenic Acid; D019787:Linoleic Acid