title: [Study on ursolic acid extraction rate by ultramicro smashing and conventional smashing from leaves of Paulownia fortunei].
abstract: OBJECTIVE
  To study on ursolic acid extraction rate from leaves of Paulownia fortunei by conventional powder and ultramicro powder.
  
  
  METHODS
  We spent different time extracting ursolic acid from coventional powder and ultramicro powder, then determined the content by HPLC and compared.
  
  
  RESULTS
  In ultramicro powder the extraction of ursolic acid was nearly twice of conventional powder; The time reaching the maximum extraction of ultramicro powder was 5 minutes, but that of conventional powder was 20 minutes.
  
  
  CONCLUSIONS
  The extraction of ursolic acid from leaves of Paulownia fortunei by ultramicro smashing is more efficient.
authors.affiliation: Gansu College of TCM, Lanzhou 730000, China. yxhg123@sina.com
authors.forename: Xiao-Hui
authors.initials: XH
authors.lastname: Yu
authors.forename: Lei
authors.initials: L
authors.lastname: Zhao
authors.forename: Jing
authors.initials: J
authors.lastname: Shao
authors.forename: Lv-Yi
authors.initials: LY
authors.lastname: Chen
authors.forename: Yu-Hong
authors.initials: YH
authors.lastname: Chen
mesh_terms: D002851:Chromatography, High Pressure Liquid; D010316:Particle Size; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011208:Powders; D015203:Reproducibility of Results; D028083:Scrophulariaceae / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods*; D013997:Time Factors; D014315:Triterpenes / Q000032:analysis / Q000302:isolation & purification*; D000097245:Ursolic Acid
chemical_list: D011208:Powders; D014315:Triterpenes; D000097245:Ursolic Acid