title: [Optimization of extraction on flavonoids from leaves of Heritiera littoralis].
abstract: OBJECTIVE
  To optimize the preparation procedure for extraction of flavonoids from leaves of Heritiera littoralis.
  
  
  METHODS
  Comparing microwave extraction and ultrasonic extraction, The content of total flavonoids was measure by UV spectrophometry and the wavelength set at 510 nm. The effects of treatment time, extraction power, ethanol concentration and solid-liquid ratio were studied. The orthogonal test of four factors and three levels were studied to obtain the extraction technology of flavonoids from leaves of Heritiera littoralis.
  
  
  RESULTS
  The optimal technical conditions were mixing leaves of Heritiera littoralis with 70% ethanol on the ratio of 1 g: 30 mL, when microwave treatment time was 8 min and micro-wave power was 400 W. Under this condition, the extraction rate reached 6.15%.
  
  
  CONCLUSIONS
  This study explores a practical extraction method for flavonoids from leaves of Heritiera littoralis, and lay a good foundation for mangrove medical research in future.
authors.affiliation: Qinzhou University, Qinzhou 535000, China. zhangyanjun0773@163.com
authors.forename: Yan-Jun
authors.initials: YJ
authors.lastname: Zhang
authors.forename: Chong-Wei
authors.initials: CW
authors.lastname: Peng
authors.forename: Shu-Qing
authors.initials: SQ
authors.lastname: Xu
authors.forename: Yun-Ying
authors.initials: YY
authors.lastname: Zheng
authors.forename: Qing-Juan
authors.initials: QJ
authors.lastname: Xie
mesh_terms: D005419:Flavonoids / Q000302:isolation & purification*; D019660:Malvaceae / Q000737:chemistry*; D008872:Microwaves; D018515:Plant Leaves / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013678:Technology, Pharmaceutical / Q000379:methods*; D013696:Temperature; D014465:Ultrasonics
chemical_list: D005419:Flavonoids; D012997:Solvents