title: [Determination of total flavonoids in Abrus cantoniensis and its dynamic changes].
abstract: OBJECTIVE
  To develop a method for ultrasonic extraction and determination of total flavonoids in Abrus cantoniensis, and to analyze its dynamic changes.
  
  
  METHODS
  The optimized condition of extraction of total flavonoids was studied with orthogonal design. The contents of total flavonoids in different organs and of different growth stages were determined by UV-visible spectrophotometer.
  
  
  RESULTS
  The ethanol volume and extraction times were the main factors impacting the effects of ultrasonic extraction. The content of total flavonoids in stems were higher than in roots and the lowest in leaves. The dynamic changes of total flavonoids contents in roots and stems of A. cantoniensis were in similar trends. Its total flavonoids content in the two parts of plant increased gradually with the growth and reached the maximum in October, and the content decreased significantly in Feburay of next year. The content of total flavonoids in leaves reached also to the highest value before leaves fell off.
  
  
  CONCLUSIONS
  The optimized extraction method of total flavonoids in Abrus contoniensis was obtained with three times with 80% ethanol at 20 times of volume for 30 min. The results implied that the best yield and quality may be obtained before leaves fall.
authors.affiliation: Agricultural College of Guangxi University, Nanning 530005, China.
authors.forename: Rong-Shao
authors.initials: RS
authors.lastname: Huang
authors.forename: Yong-Xiong
authors.initials: YX
authors.lastname: Yu
authors.forename: Yan
authors.initials: Y
authors.lastname: Hu
authors.forename: Xiao-Bang
authors.initials: XB
authors.lastname: Sheng
mesh_terms: D029912:Abrus / Q000737:chemistry* / Q000254:growth & development; D000431:Ethanol; D005419:Flavonoids / Q000302:isolation & purification*; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry* / Q000254:growth & development; D012621:Seasons; D013678:Technology, Pharmaceutical / Q000379:methods*; D014465:Ultrasonics
chemical_list: D005419:Flavonoids; D000431:Ethanol