title: [Circulated extraction of flavonoids from Glechoma longituba by ultrasonic wave].
abstract: OBJECTIVE
  To investigate the optimum condition of extraction for the flavonoids in Glechoma longituba by ultrasonic wave.
  
  
  METHODS
  Using orthogonal test, the effects of ultrasonic power, ultrasonic time, extraction temperature and solvent concentration were considered, the comprehensive evaluation was guided by the content of the flavonoids determined by ultraviolet spectrophotometer.
  
  
  RESULTS
  The optimum condition was as follow: ultrasonic power; 800 W, ultrasonic time 90 min, extraction temperature 40 degrees C, solvent concentration 65%. The flavonoids concent is 5.228%.
  
  
  CONCLUSIONS
  Using ethanol as solvent, circulated extraction of the flavonoids from G. longituba with ultrasonic wave is feasible with the optimum conditions in low temperature, short time and high production yield.
authors.affiliation: Jinzhou Medical College, Jinzhou 121001, China.
authors.forename: Chun-Ling
authors.initials: CL
authors.lastname: Yuan
authors.forename: Wei-Ying
authors.initials: WY
authors.lastname: Guo
mesh_terms: D005419:Flavonoids / Q000302:isolation & purification*; D019686:Lamiaceae / Q000737:chemistry*; D035261:Plant Components, Aerial / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D013997:Time Factors; D014465:Ultrasonics
chemical_list: D005419:Flavonoids